66results about How to "Prevent self-discharge" patented technology

The invention discloses sulfenyl anode of a lithium-sulfur rechargeable battery and a preparation method thereof. The sulfenyl anode is prepared by the steps of: equally mixing sulfenyl compound active material, cyclodextrin binder and carbon conductivity agent, coating the mixture on an aluminum foil current collector and obtaining the sulfenyl anode after drying and pressing. The coating thickness is 50 to 100 microns and the aluminum foil thickness is 20 to 30 microns; the mass ratio of the sulfenyl compound active material, the cyclodextrin binder and the carbon conductivity agent is 7 to 8:0.6 to 1:0.6 to 1.5, wherein the sulfenyl compound active material is formed by the steps of: equally mixing carbon nano tube, sulfur and polyacrylonitrile according to the mass ratio of 0.1 to 0.2:6 to 8:1 and sintering the mixture in protection of inert gas at the temperature of 300 to 320 DEG C for insulation for 6 to 8 hours. By using the lithium-sulfur rechargeable battery with the sulfenyl anode and lithium metal cathode, the reversible capacity of the sulfenyl compound active material reaches 680mAh.g under 0.1C multiplying power charge-discharge condition; and compared with the discharge capacity of second circulation, the discharge capacity after 100 times of circulation decreases less than 10 percent.

There is provided a thin air battery comprising a power-generating element including air diffusion paper and a water repellent film, the power-generating element sealed in a package composed of first and third sheet layers that cover the air electrode side and negative electrode side of the power-generating element, and a second sheet layer disposed in the peripheral portion between the two sheet layers and joined to the two sheet layers. The sheet layers are each composed of a thin film formed by stacking an alkali resistant polymer film having hydrogen gas permeability and a polymer film having gas barrier properties, and in each of the first and third sheet layers, the polymer film having hydrogen gas permeability is disposed on the internal surface side. According to the present invention, a thin air battery that has high energy density and has excellent long-term reliability is provided.

The invention relates to a magnesium-containing superlattice hydrogen storage alloy and a preparation method thereof. The invention is characterized in that the chemical formula of the magnesium-containing superlattice hydrogen storage alloy is Mm[1-x-y-z]La[x]Mg[y]M[z](Ni[a]Al[b])[c], wherein Mm is rare earth or mixed rare earth metal, and at least contains one or more of La, Ce, Pr, Nd, Y and Sm; M is one or more of Ti, Zr, Hf, Ca, Sr and Ba; and x, y, z, a and b respectively represent mol ratio, 0<x<0.3, 0<y<0.25, 0<z<0.05, 0.8<a<1.0, 0<b<0.2 and 3.0<b<4.0. The hydrogen storage alloy is composed of a single phase or multiple phases. Compared with the prior art, the invention has the advantages of high heavy-current discharge capacity, favorable low self-discharge property, high capacity and long service life, and does not contain Co and Mn, thereby avoiding self-discharge caused by shuttle reaction of Co and Mn.

The invention provides a repairing reducing agent for lead-acid storage batteries, which can dissolve lead sulfate crystals deposited on polar plates. Metal ions are not introduced in, so that the self discharge of the metal ions and the softening of the polar plates can be avoided. The physical structure of the batteries is not destroyed, the chemical environment of the batteries is not changed and an organic protective film can be formed on the surface of the polar plates of the batteries to restrain the deposition of newly-generated lead sulfate crystals and ensure the long-term action and the stability of repair effects. A nanometer graphene oxide material which is beneficial for increasing the specific surface area of electrodes, improving the surface structure of the electrodes, lowering the internal resistance and improving the transfer efficiency of interface electrons is introduced in. The electric conductance of electrolyte is enhanced, the internal resistance of the batteries is lowered, and the capacity restorability and the recharging receptivity after the overdischarge of the storage batteries are improved. The battery capacity can be restored to the maximum degree and the service life of the batteries is prolonged. The capability of the repaired storage batteries can be restored to more than 90% and the service life of the repaired storage batteries can be prolonged by double or more.

The invention relates to the field of alkaline redox flow battery energy storage, in particular to a preparation method of an ion exchange membrane for an alkaline redox flow battery, which is mainlyused for solving the problem of the high price of a Nafion diaphragm in the alkaline redox flow battery at the present stage, so that the cost of the redox flow battery is greatly reduced. An alkalineaqueous solution of ferricyanide (such as Na3[Fe(CN)6], K3[Fe(CN)6], (NH4)3[Fe(CN)6] and the like) is used as a positive electrolyte, and a strong alkaline solution (such as KOH, NaOH and the like) is used as a negative electrolyte; graphite felt and carbon felt are selected as positive electrode materials, and a zinc plate is selected as a negative electrode material; and the ionized sulfonatedpolyether ether ketone (SPEEK) diaphragm is used as an ion exchange membrane to assemble the battery. Therefore, the alkaline redox flow battery system with low cost and high performance is obtained.The flow battery system provided by the invention has the advantages of the high open-circuit voltage, the low cost, the high efficiency, the good cycling stability, safety, reliability and the like,and has a wide application prospect.

The invention relates to an air managing system of a lithium-air secondary battery pack and solves the technical problems that the air managing system of the lithium-air secondary battery pack in the prior art occupies a large space, consumes great energy and generates noises in the working process. The air managing system of the lithium-air secondary battery pack comprises a natural wind air supplying system, a forced air supplying system and a lithium-air secondary battery pack power supply system, wherein the natural wind air supplying system monitors the air flow speed of an outer environment to control a working state of the forced air supplying system, so as to continuously supply air to the lithium-air secondary battery pack. According to the air managing system of the lithium-air secondary battery pack, disclosed by the invention, the occupying space of the battery pack is small; the high-speed air can be sent out to move under relatively-low power loss; and the noises are small in the working process. The air managing system disclosed by the invention can realize the automatic control, can also provide sufficient air flows for the lithium-air secondary battery pack, and is suitable for other metal-air batteries.

The invention discloses a structure and a fabrication method of an integrated liquid storage pot, and a novel zinc-bromine redox flow battery. The novel zinc-bromine redox flow battery comprises a liquid storage pot 1, a liquid supply pump A2, a liquid supply pump B3, an anode pipeline system 41, a cathode pipeline system 42, a galvanic pile 5, an anode return pipe 71 and a cathode return pipe 72; the liquid storage pot 1 is connected to the liquid supply pump A2, the liquid supply pump B3, the anode return pipe 71 and the cathode return pipe 72, respectively; the galvanic pile 5 is connected to the anode pipeline system 41, the cathode pipeline system 42, the anode return pipe 71 and the cathode return pipe 72, respectively; the liquid supply pump B3 is connected to the anode pipeline system 41; and the liquid supply pump A2 is connected to the anode pipeline system 41 and the cathode pipeline system 42. The anode and the cathode of the battery are connected back to the same liquid storage pot 1, so that the migration problem is fundamentally solved; the system is simple and the fault rate is low; and the same liquid supply pumps are adopted for supplying liquid so that the pressure on the two sides of the anode and cathode pipeline systems is balanced, and the deformation rate of the material is reduced.

The invention relates to an energy-gathered indication battery. The energy-gathered indication battery comprises a shell, a negative plate, an anode material and a positive pole, wherein a sealing plate is mounted on the upper surface of the anode material; a pressure spring is fixed on the sealing plate; a liquid sealing plate is fixed at the upper end of the pressure spring and is made of a permanent magnet material, and the sealing plate and the liquid sealing plate are both closely arranged on the positive pole in a sleeving manner; the upper end of the positive pole is covered with a liquid sealing film, and a gap between the liquid sealing film and the liquid sealing plate is filled with a conducting solution; a vacuum plate is fixedly and parallelly mounted above the liquid sealing film, and a gap between the vacuum plate and the liquid sealing film is vacuumized; a positive terminal is fixedly inserted into the vacuum plate; a permanent magnet paste is mounted in the position right facing the liquid sealing plate outside the shell. The battery can be effectively prevented from self-charging, and the storage period of the battery is effectively prolonged; meanwhile, the battery service condition can be displayed, and the battery use is more scientific.

The invention relates to a novel anti-liquid leakage zinc air battery for carbonation self-test and solves the problems that battery electrolyte is easy for moisture absorption and is easy to leak, and the battery failure is caused by carbonation. The novel leak-proof liquid zinc air battery comprises a battery shell, an air anode, a diaphragm, a zinc cathode and electrolyte from outside to inside in sequence; the zinc air battery is separated by the diaphragm and consists of an anode chamber and a zinc cathode chamber; the air anode is provided with a waterproof breathable layer, an oxygen selectivity permeable membrane and a carbon dioxide adsorption layer, and the section of a current collecting net is rectangular wavy, so that the air through rate is improved; an electrolyte chamber wall is made of thin rubber; a felting needle made of organic glass is arranged inside a spring port, the length of the felting needle is slightly less than the height of the electrolyte chamber, and the inner wall of the electrolyte chamber can be punctured only through lightly pressing the spring port, so that the electrolyte can be fused with calamine cream; the problems of quality guarantee, moisture absorption, liquid leakage and carbonation of the battery are effectively solved.

An electrical double layer capacitor (EDLC) energy storage device is provided that includes an electrolyte having an anionic catholyte and a cationic anolyte, a positively charged electrode, and a negative charged electrode, where negatively charged oxidized species in the anionic catholyte are electrostatically attracted to the positively charged electrode, where positively charged reduced species in the cationic anolyte are electrostatically attracted to the negatively charged electrode, where self-discharge of the EDLC energy storage device is prevented.

The invention provides an electrochemical power-supply composite membrane and a preparation method thereof. The electrochemical power-supply composite membrane comprises a non-woven fabrics layer and a polyvinylidene fluoride-hexafluoropropene copolymer layer combining with the surface of the non-woven fabrics layer, and the thickness of the polyvinylidene fluoride-hexafluoropropene copolymer layer is 5-10 mu m. The preparation method of the electrochemical power-supply composite membrane comprises: preparing an organic solution of polyvinylidene fluoride-hexafluoropropene copolymer, coating the non-woven fabrics layer with the organic solution of polyvinylidene fluoride-hexafluoropropene copolymer, performing drying process and the like. The electrochemical power-supply composite membrane is good in heat resistance and stable in thermal dimension, has uniformly-distributed pores capable of effectively avoiding direct contact of electrode particles, and is high in safety. The preparation method of the composite membrane is simple, the condition is easy to control, the requirements on equipment are low, the production efficiency is high, the production cost is low, and the preparation method is suitable for industrial production.

The invention relates to an on-vehicle energy storage device of an electromobile, which comprises a battery box, a battery management system and a plurality of storage battery modules. The battery box comprises a battery box upper cover and a battery box lower box; the battery box upper cover is detachably arranged on the battery box lower box and forms seal with the battery box lower box; the battery management system and the storage battery modules are arranged in the battery box; a storage battery positive pole, a storage battery negative pole, a battery status parameter reading port, a management system maintenance port and a seal detecting port are arranged on the battery box; the storage battery positive pole is connected with the storage battery negative pole through the storage battery modules; the storage battery modules are in series or in parallel; the battery status parameter reading port and the management system maintenance port are respectively in electric connection with the battery management system; and the battery management system is respectively connected with the storage battery modules. The on-vehicle energy storage device of the electromobile disclosed by the invention has the characteristics of ingenious design, simple structure, stable performance and long service life, is dustproof, waterproof, safe and reliable and can be maintained conveniently, thereby being suitable for large-scale popularization and application.

The invention provides a repairing reducing agent for a lead-acid storage battery. Lead sulfate crystal deposited on an electrode plate can be dissolved. No metal ion is introduced, so that self-discharge of the metal ion and softening of the electrode plate can be avoided; a physical structure of the battery is not destroyed; the chemical environment of the battery is not changed; an organic protection film can be formed on the surface of the electrode plate of the battery; deposition of newly generated lead sulfate crystal is inhibited; and long-acting and stable repairing effect can be ensured. A nano oxidized graphene material is introduced, so that improvement of the specific surface area of an electrode is facilitated; the electrode surface structure is improved; the internal resistance is reduced; the interfacial electron transfer efficiency is improved; the conductivity of an electrolyte is strengthened; the internal resistance of the battery is reduced; the capacity recovery performance and the recharge acceptance of the storage battery after being over-discharged are improved; the capacity of the battery can be restored to the maximal extent; the service lifetime of the battery is prolonged; the capacity of the repaired storage battery can be restored to over 90%; and the service lifetime can be doubled or above.

The invention belongs to the technical field of a lithium ion battery, and specifically relates to a high-energy-density ternary NCA battery and a preparation method therefor. The high-energy-density ternary NCA battery comprises a positive electrode material, a negative electrode material and an electrolyte; and the preparation method for the high-energy-density ternary NCA battery comprises the following steps of 1) preparation of a positive plate; 2) preparation of a negative plate; 3) preparation of the electrolyte; and 4) preparation of a finished battery. By virtue of improvement on the negative electrode material, the coating uniformity and density are improved without causing partial crack in circulation, generation of a new surface is suppressed, side reaction is reduced, generation of a new SEI film is reduced, and effective utilization ratio of silicon is improved; by matching with the ternary NCA positive electrode material, the material structure can be stabilized, and the normal-temperature cycling performance, the high-temperature cycling performance and the thermal stability can be improved; and meanwhile, the electrolyte is added with a positive electrode surface protecting agent, a lithium hexafluorophosphate stabilizing agent and a negative electrode SEI film forming additive, thereby improving the safety and prolonging the high-temperature cycle life of the battery.

The invention discloses an air supply system for a zinc-air power battery pack. The air supply system comprises an air blower, an air inlet pipeline, the zinc-air power battery pack, an air outlet pipeline, a controller, a heater, a first temperature sensor, a first electromagnetic valve, a second temperature sensor and a second electromagnetic valve, wherein the air blower, the air inlet pipeline, the zinc-air power battery pack and the air outlet pipeline are sequentially connected; the heater, the first temperature sensor, the first electromagnetic valve, the second temperature sensor and the second electromagnetic valve are connected with the controller; the heater is arranged on the end part, close to the air blower, of the air inlet pipeline; the first electromagnetic valve is arranged on the end part, close to the zinc-air power battery pack, of the air inlet pipeline; the first temperature sensor is arranged on the air inlet pipeline between the air blower and the first electromagnetic valve; the second electromagnetic valve is arranged on the end part, close to the zinc-air power battery pack, of the air outlet pipeline; and the second temperature sensor is arranged on the air outlet pipeline between the zinc-air power battery pack and the second electromagnetic valve. The system can block air to prevent self-discharging in the non-working state of a zinc-air power battery, can be started at low temperature to make the performance of the battery normally developed, and also can be self-powered on to start the controller to control timely and accurate air supply.

The invention relates to the field of a vanadium cell, and particularly relates to a liquid flow frame device for the vanadium cell, and the vanadium cell containing the liquid flow frame device, which can be used for overcoming the defects of low leakage resistance, reliability and stability and the like in a liquid flow frame of the prior art and the defect of low reliability of the traditional vanadium cell. A liquid flow frame which is provided with passageways, liquid openings and liquid holes is adopted in the liquid flow frame device, wherein the liquid openings refer to a liquid inlet opening and a liquid outlet opening; the liquid holes refer to a liquid inlet hole and a liquid outlet hole; a sheet frame I and a sheet frame II are arranged at the two sides of the liquid flow frame in parallel, a rotary liquid flow passageway I and a rotary liquid flow passageway II are respectively arranged on the sheet frame I and the sheet frame II, a structure is centrally and symmetrically arranged between the rotary liquid flow passageway I and a rotary liquid flow passageway II, each rotary liquid flow passageway is an arch passageway which is bended and rotary more than two times, and the arch passageways are distributed at the two sides of the liquid flow frame. The liquid flow frame device provided by the invention has better reliability, stability and higher efficiency. The vanadium cell has high reliability, efficiency and stability.

The invention relates to an energy-saving battery easy to take. The energy-saving battery easy to take comprises a battery body and a rotary cap, wherein an anode of the battery body is rotationally sleeved with the rotary cap through a snap ring; a contact block only capable of doing reciprocating translation along an axis of the battery is mounted at the end part of the rotary cap and is made from a conductive permanent magnet material; a convex point is arranged in the center of an outer end surface of the contact block; a conductive permanent magnet sheet is adhered onto the anode of the battery body, and the same poles of the conductive permanent magnet sheet and the contact block repel. The battery can automatically separate the anode of the battery from a cathode of the battery to improve electricity storage capacity of the battery, and is convenient to dismount and mount.

The invention provides a method for efficiently purifying and recycling a lithium ion battery positive electrode powder material. The method comprises the steps: taking a lithium ion battery positiveplate and adding an organic solvent; heating and stirring to separate a dressing from an Al foil; sieving to remove the Al foil and aluminum scraps; filtering and drying to obtain powder; and carryingout chemical element analysis test on the powder, when the weight content of the Al element is greater than or equal to 0.3%, sieving by a sieve with a higher mesh number, and carrying out chemical analysis test again until the weight content of the Al element is less than 0.3%, so as to obtain the lithium ion battery positive electrode powder material which is efficiently purified and recycled.The positive plate is layered LiMeO2, wherein Me is one or more of Ni, Co and Mn; or the positive plate of the lithium ion battery is LiMePO4, wherein Me is one or more of Fe and Mn. The heating and stirring temperature is 20-200 DEG C, and the speed is 10-2000 r / min; the drying temperature is 50-300 DEG C, and the drying time is more than or equal to 10 min. The method disclosed by the inventionis beneficial to improving the regeneration efficiency of the recycled material, is good in performance index repeatability and high in resource utilization rate, and has quite high social and economic values.

The invention discloses a method for preparing a cathode electrode material of a nanometer sheet microspheric lithium ion cell, belonging to the field of energy sources. The method comprises the following steps of: firstly alternatively carrying out the heat treatment and the acid washing treatment on NH4FePO4 to prepare FePO4.H2O nanometer sheet microspheres with a porous structure, and reducingwith an acetonitrile solution of LiI at room temperature, finally mixing with cane sugar and sintering in vacuum at high temperature to obtain carbon-coated olivine-type LiFePO4 multilevel nanometer sheet microspheres. The method has simple process and is easy for operation, and the synthesized material has high purity, high activity, small particle diameter, narrow and small distribution; meanwhile, the high temperature treatment is short so that the shortages of larger particle diameter and wider distribution due to high temperature incineration are overcome, and the electrical conductivityand the lithium intercalation and de-intercalation stability of the LiFePO4 are effectively improved; in addition, the prepared material has the characteristics of high specific capacity, good cyclical stability and high conservation rate of high-rate discharge capacity, and is suitable to be used as the cathode electrode material of high-power lithium ion cell.

The invention discloses an environment-friendly battery for water injection electric power generation and a positive electrode and a battery pack thereof. The positive electrode comprises a positive electrode current collector and a positive electrode active layer arranged on the surface of the positive electrode current collector, wherein the positive electrode active layer comprises a first water adsorbing material base layer and a soluble copper salt adsorbed on the first water adsorbing material base layer. The environment-friendly battery for water injection electric power generation disclosed by the invention comprises a battery shell, a positive electrode and a negative electrode, wherein a water inlet is formed in the battery shell. The environment-friendly battery is characterized by further comprising a semi-transparent isolating membrane and a salt bridge layer; the positive electrode, the semi-transparent isolating membrane, the salt bridge layer and the negative electrode are laminated in sequence to form a battery cell and are arranged inside the cavity of the battery shell; the battery shell at least comprises an insulating layer, and the insulating layer is used for directly packaging the battery cell inside the cavity of the shell; and the positive electrode is the positive electrode of the environment-friendly battery. According to the positive electrode, an electron reaction can be obtained more quickly, and then a higher discharge rate is obtained. The environment-friendly battery for water injection electric power generation disclosed by the invention can realize continuously stable discharge, and the discharge rate is high.

The invention relates to a high-specific-capacity lithium nickel-cobalt-manganese cathode material and a preparation method thereof. The materials comprise a precursor, an aluminum doped body, a borondoping body, a coating body and a lithium source. The precursor comprises the following components: 50-90% of nickel sulfate, 5-30% of manganese sulfate and 5-30% of cobaltous sulfate. The method comprises the steps of: preparing a metal sulfate solution, and uniformly mixing the nickel sulfate, the cobaltous sulfate, the manganese sulfate and the aluminum sulfate; preparing 10-20% of sodium hydroxide solution and 5-10% of ammonia-water solution, adding the sodium hydroxide solution and the ammonia-water solution into the metal sulfate solution, regulating the pH of the solution to obtain a mixed solution; heating and stirring the mixed solution to obtain a precipitate, and performing washing, extraction filtration and drying of the precipitate to obtain an aluminum doped Ni-Co-Mn hydroxide precursor; performing ball-milling and full mixing of the precursor with the lithium hydrate, the diboron trioxide and the silicon dioxide to obtain a mixture; and sintering the mixture to obtain alithium nickel-cobalt-manganese cathode material. The cycle performance of the lithium manganate battery can be effectively improved, the self-discharge phenomenon is inhibited, the operation is simple, the cost is low, and the industrialization is easy to achieve.

The invention discloses a preparation method of a graphene low-temperature battery. The preparation method is applied to batteries of lithium titanate negative pole systems. An existing rechargeable battery only can be charged to 50-70% the total battery capacity in a low-temperature environment. The preparation method includes the steps that slurry needed for coating a battery positive pole plate is prepared from a lithium manganate positive electrode, a binding agent and a conductive agent; homogenate of slurry needed for coating a battery negative pole plate is prepared from a conductive agent containing conductive graphene slurry; coating of the battery positive pole and the battery negative pole is carried out, and blank foil is reserved on the upper and lower sides of the positive pole and the negative pole; rolling and cutting of the battery positive pole plate and the battery negative pole plate are carried out; battery assembling is carried out; battery formation and aftertreatment are carried out. The preparation method has the advantages that the battery can be charged to 90% the total battery capacity within 6 min in an environment where the temperature is -40 DEG C, and meanwhile the battery has super-high cycle performance and low internal resistance.

The invention discloses a tab protection adhesive tape pasting structure of a lithium ion battery and a control process of the tab protection adhesive tape pasting structure. A lithium ion battery tab protection adhesive tape is a high-temperature resistant insulation adhesive tape, and a pasting design is in a way that the protection adhesive tape covers a tab welding region and a pole plate edge and extends out of the pole plate edge. The tab protection adhesive tape pasting design relates to a tab protection welding position, a pole plate edge protection position and a tab bending position, so that a positive pole plate and a negative pole plate are protected by the protection adhesive tape when a battery cell is in a high-vibration electric vehicle application environment relative positions of the positive pole plate and the negative pole plate move and the positive pole plate and the negative pole plate are in friction, a tab bending part is also protected by the protection adhesive tape, automatic discharge caused by damage to a separator at a corresponding position is prevented, and the safety performance of the battery cell is improved.

The invention discloses a method for preparing polymer electrolyte for improving self-discharge of a lithium-sulfur battery and an application and provides a novel polymer electrolyte material and a preparation method of the same. The polymer electrolyte includes sulfonic acid lithium salt, high molecular polymer, solvent and plasticizer. Efficient chemical properties can be achieved, dendritic and shuttle problems of batteries in the prior art are avoided, the preparation method is simple and environmentally friendly, and the material can be made to achieve good mechanical properties and heatresistance properties. The polymer electrolyte is advantaged in that the polymer electrolyte is applied to the field of the lithium-sulfur battery.

The invention discloses an additive and an electrolyte and a lithium ion battery using the additive, the additive comprises a compound 1, a compound 2 or a compound 3, the additive can orderly form a film when the battery is charged and discharged for the first time, and a formed solid electrolyte interface film has the characteristics of strong conductivity, strong ionic conductivity and low electron conductivity; therefore, the rate cycle performance, the rate discharge performance and the storage performance of the lithium ion battery can be effectively improved.

The invention discloses sulfenyl anode of a lithium-sulfur rechargeable battery and a preparation method thereof. The sulfenyl anode is prepared by the steps of: equally mixing sulfenyl compound active material, cyclodextrin binder and carbon conductivity agent, coating the mixture on an aluminum foil current collector and obtaining the sulfenyl anode after drying and pressing. The coating thickness is 50 to 100 microns and the aluminum foil thickness is 20 to 30 microns; the mass ratio of the sulfenyl compound active material, the cyclodextrin binder and the carbon conductivity agent is 7 to8:0.6 to 1:0.6 to 1.5, wherein the sulfenyl compound active material is formed by the steps of: equally mixing carbon nano tube, sulfur and polyacrylonitrile according to the mass ratio of 0.1 to 0.2:6 to 8:1 and sintering the mixture in protection of inert gas at the temperature of 300 to 320 DEG C for insulation for 6 to 8 hours. By using the lithium-sulfur rechargeable battery with the sulfenylanode and lithium metal cathode, the reversible capacity of the sulfenyl compound active material reaches 680mAh.g<-1> under 0.1C multiplying power charge-discharge condition; and compared with the discharge capacity of second circulation, the discharge capacity after 100 times of circulation decreases less than 10 percent.

In the first charging / discharging process of a liquid-state lithium ion battery, a battery material reacts with electrolyte on a solid-liquid phase interface to form a layer of passivation layer covered on the surface of the electrode material, the passivation film with the feature of the solid electrolyte is called as solid electrolyte interface, and abbreviated as SEI. The essence of the SEI isthe compound generated by enabling the electrode material to electrochemically react with the electrolyte and the lithium ion under a certain voltage, and substance generated in the SEI reaction has electronic insulation and lithium ion permeability (insulation conducting), is wide in electrochemical window and soluble in the electrode material, and the substance cannot be dissolved in the electrolyte, so that the substance is an ideal solid-state electrolyte material. By adopting the SEI film synthesis mechanism, the produced solid-state electrolyte material is well matched with the electrode, can be used for producing the full-solid-state battery, and can be further used for producing the non-porous insulation conductive diaphragm for the liquid electrolyte battery, thereby preventing self-discharging between the electrodes and the lithium dendrite short-circuit and solving the lithium-sulfur battery polysulfide shuttling and like problems difficult to solve.

The invention discloses a method for reducing battery self-discharge and improving safety performance. The method comprises the following steps of: (1) shearing a battery pole piece coated with polar powder during the process of producing the battery pole piece; and (2) carrying out protection processing operation on the left side edge and right side edge of the sheared battery pole piece so as to form smooth outer surfaces at the two sides of the battery pole piece. Moreover, the invention further discloses a battery pole piece for reducing the battery self-discharge and improving the safety performance. According to the method and battery pole piece for reducing the battery self-discharge and improving the safety performance, the edge protection treatment can be conveniently and quickly carried out on the battery pole piece after a shearing process, loose polar powder at the edges of the battery pole piece is prevented from falling in a subsequent manufacturing process, so that the battery self-discharge problem caused by falling polar powder is avoided; and the polar powder is prevented from piercing a battery diaphragm, so that the safety performance of a battery is guaranteed, the improvement on the overall production quality of the battery is favored, and the method and the battery pole piece have significant production practical significance.

The invention provides an electrochemical power-supply composite membrane and a preparation method thereof. The electrochemical power-supply composite membrane comprises an oxidized aluminium net layer and a polyvinylidene fluoride-hexafluoropropene copolymer layer combining with the surface of the aluminium net layer, and the thickness of the polyvinylidene fluoride-hexafluoropropene copolymer layer is 5-10 mu m. The preparation method of the electrochemical power-supply composite membrane comprises: preparing an organic solution of polyvinylidene fluoride-hexafluoropropene copolymer, performing oxidation process on the aluminium net, coating the aluminium net with the organic solution of polyvinylidene fluoride-hexafluoropropene copolymer, performing drying process and the like. The electrochemical power-supply composite membrane is good in heat dissipation effect and resistant to high temperature, has uniformly-distributed pores capable of effectively avoiding direct contact of electrode particles, and is high in safety. The preparation method of the composite membrane is simple, the condition is easy to control, the requirements on equipment are low, the production efficiency is high, the production cost is low, and the preparation method is suitable for industrial production.

The invention relates to a preparation method of a positive electrode of a lithium-ion secondary battery for an electric toothbrush or an electric shaver. The condition that Ir is located on the surface of an active material is ensured by adding the Ir to the surface of the positive active material and adopting a microwave preparation method through a core / shell preparation method; meanwhile, decomposition of an electrolyte is avoided by adding a self-discharge inhibitor to the preparation process of the positive electrode; finally, lithium ions in the electrolyte are prevented from entering a positive electrode material again in the charging process by combining an ageing treatment process of the active material; and through mutual combination and synergistic action of the three aspects, the self-discharge phenomenon of the lithium-ion battery is reduced, the working time is prolonged, and the service time is 50%-60% longer than a common phosphate lithium salt positive electrode material when the positive electrode is used for the electric toothbrush or the electric shaver.