31results about How to "High capacity recovery rate" patented technology

The invention provides a lithium-ion battery electrolyte for a high-voltage ternary positive electrode material system. The lithium-ion battery electrolyte comprises a non-aqueous solvent, lithium hexafluorophate and a functional additive; the functional additive comprises a cyclic anhydride compound, a lithium salt type additive and methylene methanedisulfonate; the general structural formula of the cyclic anhydride compound is as shown in the description, wherein R1, R2, R3 and R4 are independently selected from any one of hydrogen atom, fluorine atom, or straight chain or branched chain alkyl with the number of carbon atoms of 1-4. The cyclic anhydride compound used in the lithium-ion battery electrolyte is higher in reduction potential (the reduction potential of succinic anhydride is 1.50 V vs Li+ / Li) on the negative electrode surface, so that other components in the electrolyte can be preferably reduced into films in the first charging process of the battery, the formed SEI film is high in stability. The cyclic anhydride compound used in the lithium-ion battery electrolyte is capable of effectively improving the cycle performance and high-temperature performance of the battery; and compared with fluoroethylene carbonate, the cyclic anhydride compound has excellent high-temperature performance as well as capability of improving the cycle performance.

Provided are an electrolyte for a lithium secondary battery and a lithium secondary battery containing the same. The lithium secondary battery using the electrolyte for a lithium secondary battery according to the present invention has excellent high-temperature stability, high-temperature capacity recovery rate, low-temperature discharge capacity, and life cycle characteristics.

Belonging to the technical field of lead acid batteries, the invention in particular relates to a lead acid battery repair liquid and a preparation method thereof, and solves the problems of incomplete battery repair, troublesome operation, poor effect, easy secondary pollution, long preparation period of battery repair liquid, low preparation efficiency and poor stability in the prior art. The lead acid battery repair liquid comprises the following raw materials by weight: 0.5-1 part of nano-carbon sol, 0.3-0.8 part of tin dioxide, 2-5 parts of potassium polyvinyl sulfate, 3-8 parts of sodiumpolystyrene sulfonate, 1-1.5 parts of a mixed metal salt, 3-4.5 parts of sodium alginate, 0.8-1.6 parts of an antioxidant, 35-50 parts of a sulfuric acid solution, and 60-90 parts of distilled water.The lead acid battery repair liquid obtained by the invention has the advantages of good stability, comprehensive repair, convenient use, quick effect and long service life, and the lead acid batterycapacity repair rate is up to 100%. Also the preparation method is simple, has the characteristics of simple and easily available raw materials, low preparation cost, and is worth popularizing.

The invention provides a battery. The battery comprises a cathode, an anode, and an electrolyte solution. According to the battery, the cathode comprises a cathode active material capable of realizing reversible deintercalation-intercalation of first metal ions; the electrolyte solution comprises a solvent capable of dissolving and ionizing electrolytes; the electrolyte solution comprises the first metal ions and second metal ions; in charging and discharging processes, the second metal ions can be transformed into a second metal via reduction and be deposited on the anode, and the second metal can be reversibly transformed into the second metal ions via oxidation dissolving; wherein, the cathode also comprises a silicon dioxide additive. The battery is capable of improving a problem of battery self-discharging, and improving battery electrochemical performance.

The invention provides a lithium-ion battery electrolyte for a high-voltage ternary positive electrode material system. The lithium-ion battery electrolyte comprises a non-aqueous solvent, lithium hexafluorophate and a functional additive; the functional additive comprises a cyclic anhydride compound, a lithium salt type additive and methylene methanedisulfonate; the general structural formula of the cyclic anhydride compound is as shown in the description, wherein R1, R2, R3 and R4 are independently selected from any one of hydrogen atom, fluorine atom, or straight chain or branched chain alkyl with the number of carbon atoms of 1-4. The cyclic anhydride compound used in the lithium-ion battery electrolyte is higher in reduction potential (the reduction potential of succinic anhydride is 1.50 V vs Li+ / Li) on the negative electrode surface, so that other components in the electrolyte can be preferably reduced into films in the first charging process of the battery, the formed SEI film is high in stability. The cyclic anhydride compound used in the lithium-ion battery electrolyte is capable of effectively improving the cycle performance and high-temperature performance of the battery; and compared with fluoroethylene carbonate, the cyclic anhydride compound has excellent high-temperature performance as well as capability of improving the cycle performance.

The invention discloses a high-temperature lithium ion battery electrolyte and a lithium ion battery. The electrolyte is prepared by uniformly mixing electrolyte salts, a nonaqueous organic solvent, a high-temperature film-forming additive and high-temperature gas generation inhibiting additives, wherein the high-temperature film-forming additive is lithium bis(oxalate) borate (LiBOB); the LiBOB accounts for 0.2-3% by mass of the mixed lithium salt solution formed by the electrolyte salts and the nonaqueous organic solvent; the high-temperature gas generation inhibiting additive is one or twoof ionic liquid and phthalic anhydride, and accounts for 0.8-9% by mass of the mixed lithium salt solution; and the total content of the added high-temperature film-forming additive and high-temperature gas generation inhibiting additives accounts for 1-11% by mass of the mixed lithium salt solution. The lithium ion battery comprises a cathode, an anode, a diaphragm and the high-temperature lithium ion battery electrolyte. The invention has the advantage of reasonable design, the steps in the preparation processes are simple and convenient to implement, and the prepared electrolyte and the lithium ion battery have excellent comprehensive performance.

The invention provides a method and a device for determining self-discharge of a battery pack. The method for determining the self-discharge of the battery pack comprises the following steps: firstly, obtaining the discharge capacity C0 of the battery pack at room temperature; according to the obtained discharge capacity C0, the battery pack is discharged in stages so as to obtain the discharge capacity Cn in each stage, and the discharge operation of each stage of the battery pack is carried out at normal temperature; after the battery pack is charged, at room temperature, the battery pack is subjected to standing and staged discharging, so that the actual discharging capacity Cm in each stage is obtained; and finally, obtaining the self-discharge rate of the battery pack according to the discharge capacity Cn in each stage and the actual discharge capacity Cm in each stage. According to the determination method, two groups of discharge capacitance measurement values are detected, and one group of measurement values is carried out after the battery pack stands and the environment adapts to the temperature, so that the influence of the temperature rise factor of the battery pack caused by discharge on the capacitance measurement error can be reduced; by means of correction calculation of two groups of data, more accurate self-discharge rate of the battery pack can be measured.

The present invention provides a lithium secondary battery electrolyte and a lithium secondary battery containing the same, and specifically, provides a secondary battery electrolyte with excellent high temperature stability, low temperature discharge capacity and life characteristics, the secondary battery The electrolyte contains a lithium salt; a non-aqueous organic solvent; and a boron derivative shown in the following chemical formula 1: in the chemical formula 1, R1 to R4 are independently (C1-C10) alkyl, (C6-C12) aryl or (C6-C12) aryl (C1-C10) alkyl, the alkyl, aryl and aralkyl groups of R1 to R2 can be further selected from cyano, hydroxyl, halogen, (C1-C10) alkyl and (C6-C12) One or more substituents in the aryl group are substituted.

This invention relates to a manufacturing method for high temperature-proof polyolefin micro-porous films including: a, melting the polyolefin resin and a solvent to a uniform solution, b, extruding said solution out by the mold head of an extrusion machine to be cooled and cast on a roller to become a thick plate, c, stretching the thick plate in dual way to a thin film, d, washing off the solvent on the film, e, stereotyping the film laterally the second time to get the polyolefin porous film characterizing that said film is fixed in two ways vertically and horizontally in short time high temperature process and its high temperature performance is improved greatly.

The present invention relates to a motorcycle battery, which comprises a positive electrode, an electrolytic solution and a negative electrode, wherein the positive electrode material comprises, by mass, lithium cobaltate, compound cyclic ether, a lithium iron nitrate solution, flake graphite, lithium manganate, a binder, an electric conduction agent and an additive, the electrolytic salt of the electrolytic solution comprises, by mass, ethylene glycol dimethyl ether, an emulsifier, LiCFSO and LiBF, and the negative electrode comprises, by mass, an acrylic emulsion, a filler, amorphous carbon, an electric conduction agent, a thickener, a binder, and an oily agent. With the positive electrode material of the present invention, the decomposition of the electrolytic solution and the generation of HF can be effectively inhibited, and the capacity recovery rate after the storage of the motorcycle battery can be improved.

An electrolyte for a lithium secondary battery according to exemplary embodiments may include an organic solvent, a lithium salt, and an additive including a polyalkylene glycol dialkyl ether compound having a weight average molecular weight in a specific range.

The present invention provides a novel compound, a lithium secondary battery electrolyte containing it and a lithium secondary battery containing the lithium secondary battery electrolyte of the present invention, the high temperature stability and low temperature discharge capacity of the secondary battery electrolyte of the present invention And life characteristics are very excellent.

The invention discloses a biomacromolecule restoration agent for lead-acid storage batteries. The biomacromolecule restoration agent comprises the following raw materials in parts by weight: 1-15 parts of γ-hydroxybutyric acid, 1-20 parts of acetic acid, γ-PGA1 ~30 parts, N-acetylgluconic acid 1-8 parts, Lunasin peptide 1-15 parts, ST peptide 10-50 parts, β-hydroxy-α-aminobutyric acid 1-20 parts, L-2-amino-3- 1-40 parts of hydroxypropionic acid, 20-60 parts of distilled water and 15-40 parts of sulfuric acid. In the present invention, the biomacromolecular restoration agent is used in the charge-discharge cycle process of the lead-acid battery to continuously ablate the lead sulfate crystals and prevent the lead sulfate crystals from reattaching to the electrode plate, thereby realizing the ecological restoration of the aging lead-acid battery and avoiding damage to the environment. Secondary pollution.

Provided are a lithium secondary battery electrolyte and a lithium secondary battery. The lithium secondary battery electrolyte includes a lithium salt, a non-aqueous organic solvent, and a pyrrole derivative. The lithium secondary battery includes a cathode, an anode, a separator, and the lithium secondary battery electrolyte. The secondary battery electrolyte according to the present invention has advantages of excellent stability at a high temperature and high discharge capacity at a low temperature.

The invention discloses a non-aqueous electrolyte for a lithium battery and the lithium ion battery. The non-aqueous electrolyte for the lithium battery comprises an electrolyte salt, a non-aqueous solvent and an additive, and the additive comprises an olefin sulfonate additive. According to the non-aqueous electrolyte for the lithium battery, a small amount of the olefin sulfonate additive is added, DTD, PS and PST are not used at the same time, gas production is reduced, the non-aqueous electrolyte has high film-forming sensitivity, the lithium conductivity of the battery is improved, the impedance of the battery is reduced, and meanwhile the high-temperature cycle and capacity recovery rate are improved.

Belonging to the technical field of lead acid batteries, the invention in particular relates to a lead acid battery repair liquid and a preparation method thereof, and solves the problems of incomplete battery repair, troublesome operation, poor effect, easy secondary pollution, long preparation period of battery repair liquid, low preparation efficiency and poor stability in the prior art. The lead acid battery repair liquid comprises the following raw materials by weight: 0.5-1 part of nano-carbon sol, 0.3-0.8 part of tin dioxide, 2-5 parts of potassium polyvinyl sulfate, 3-8 parts of sodiumpolystyrene sulfonate, 1-1.5 parts of a mixed metal salt, 3-4.5 parts of sodium alginate, 0.8-1.6 parts of an antioxidant, 35-50 parts of a sulfuric acid solution, and 60-90 parts of distilled water.The lead acid battery repair liquid obtained by the invention has the advantages of good stability, comprehensive repair, convenient use, quick effect and long service life, and the lead acid batterycapacity repair rate is up to 100%. Also the preparation method is simple, has the characteristics of simple and easily available raw materials, low preparation cost, and is worth popularizing.

The invention relates to an electrically exfoliated graphene silicon carbon composite material. A preparation method comprises the following steps: mixing electrically exfoliated graphene, a silicon-based material and a saccharide material according to a certain ratio, and then carrying out ball milling; carrying out spray drying granulation on the ball-milled product; and carrying out high-temperature calcination on the spray-dried product in an inert atmosphere to obtain a final product. The electrically exfoliated graphene silicon carbon composite material is prepared by the preparation method. The invention also discloses an application of the electrically exfoliated graphene silicon carbon composite material in a lithium ion battery. The electrically exfoliated graphene silicon-carbon composite material has the beneficial effects that the electrically exfoliated graphene is compounded with the silicon-based material and the saccharide material to synthesize the electrically exfoliated graphene silicon-carbon composite material with excellent cycle performance, that is, the electrically exfoliated graphene silicon-carbon composite material contains the electrically exfoliated graphene, and the content of the electrically exfoliated graphene can reach 20%; and the adopted method is high in efficiency, the production process is simple and easy to control, and large-scale production is easy.

The invention discloses electrolyte-containing nitrile ethyl amine and a lithium secondary battery. The electrolyte comprises electrolyte lithium salt, nitrile ethyl amine, a non-water organic solvent and an additive, wherein the concentration of the electrolyte lithium salt in electrolyte is 0.5-2mol / L; the nitrile ethyl amine is 0.1%-20% (in percentage by weight) of the electrolyte; the used amount of the additive is 0.1-10.0% of the weight of the organic solvent. The nitrile ethyl molecular structure comprises more than one pair of bisnitrile functional groups and can be complexed with transitional metal ions, is added by a small amount to effectively inhibit irreversible oxidation reaction of the organic solvent on a positive surface, so that the oxidization resistance of the electrolyte is improved; the nitrile ethyl molecular structure contains a Louis alkaline amine radical, and can be used for effectively stabilizing physical and chemical properties of the electrolyte through the complexing between the amine and free trace HF and PF5 in the electrolyte. With the technical characteristics, the nitrile ethyl amine is beneficial to improving the circulating performances of the battery under high voltage, so that a gas inflation rate of the battery under a high-temperature storage environment is reduced, and a capacity recovery rate is increased.

The invention relates to electrolyte of a lithium ion battery and application of the electrolyte. The electrolyte consists of electrolytes, an organic solvent and additives, wherein the additives consist of the following components by taking the total weight of the electrolyte as standard: 5-6.5% of 4,5-diethyl vinylene carbonate, 0.5-3.5% of 4-methyl-5-propyl vinylene carbonate, 3-5.2% of trimethylene sulfite, and 0.01-0.45% of methyl tertiary butyl ether. The electrolyte adopts a four-solvent system, so that the electrolyte has proper dielectric constant and viscosity; the four functional additives are added to form an SEI film with compactness and stability, meanwhile, the stability of the high-temperature SEI film at high temperature can be improved, and the high-temperature resistance of the electrolyte can be improved; the conductivity of the electrolyte is high, and the rate and the power characteristic of a lithium iron phosphate power battery can be improved effectively; the lithium ion power battery can be stored at high-temperature state, the capacity retention ratio and the capacity recovery rate are high, and the cycle performance is good.