639results about How to "Inhibition of the shuttle effect" patented technology

The invention discloses a preparation method of a composite diaphragm of a lithium-sulphur battery. The composite diaphragm is formed by modifying a coating on a diaphragm matrix. The preparation method comprises the following steps: mixing a metal organic framework material and a conductive agent according to a mass ratio of 3:1 to 1:1 to obtain a uniformly-mixed coating material; uniformly mixing the coating material with an adhesive according to a mass ratio of 9:1 to 5:1, dispersing in a solvent by adopting a mechanical mixing or ultrasonic dispersing method to obtain a uniformly dispersed coating slurry; coating the surface of the diaphragm matrix by the slurry, and drying to obtain the composite diaphragm, wherein the content of a solid material in the slurry is 60-90 mg / mL. The preparation method of the composite diaphragm of the lithium-sulphur battery is simple; large-scale production is easily realized, and strong practical value is achieved; by adopting the diaphragm in conjunction with a high-capacity electrode material, the commercialized application of the lithium-sulphur battery is effectively promoted.

The invention discloses a modified diaphragm. The modified diaphragm comprises a diaphragm substrate, and an electronic conductive coating layer and an inorganic hard coating layer positioned on the two surfaces of the diaphragm substrate respectively, wherein the electronic conductive coating layer is a mixed coating layer with graphene and a porous carbon material; and the inorganic hard coating layer is a nitrogen-carbon material coating layer, a nitrogen-silicon material coating layer, a carbon-boron material coating layer or a silicon-carbon material coating layer. The preparation method comprises the steps of uniformly coating the two surfaces of the diaphragm substrate with the electronic conductive coating layer and the inorganic hard coating layer respectively, and drying the two surfaces respectively obtain the modified diaphragm. The modified diaphragm has high diffusion and absorption capacity for an organic electrolyte, high ionic conductivity, and an obvious adsorption and blocking effect on poly-sulfur-lithium; in addition, the modified diaphragm can further restrain a shuttle effect, prevent battery short-circuit, effectively restrain the growth of negative electrode metal lithium dendrites in a cyclic process, prevent from punching the diaphragm, and protect the lithium negative electrode, so that the problem that the diaphragm is punched after dendrites formation is solved, and the safety performance of the battery is improved.

The invention discloses a preparation method of a sulfur-active carbon / graphene composite material. The preparation method comprises the following steps of (1) pre-processing a biomass raw material; (2) mixing the pre-processed biomass raw material, graphene and an activating agent to form a solid mixed material; (3) performing activation, washing, solid-liquid separation and drying on the solid mixed material to obtain an active carbon / graphene composite material; and (4) combining the active carbon / graphene composite material with sulfur to obtain the sulfur-active carbon / graphene composite material. The composite material provided by the invention has the advantages of simple preparation process step, high efficiency and low energy consumption, and production on a large scale can be achieved.

The invention discloses a lithium-sulfur battery with a conductive adsorption layer, and an application of a conductive polymer film. The lithium-sulfur battery comprises a sulfur-containing positive electrode sheet, a separation film, and a lithium negative-electrode sheet. A conductive absorption layer is arranged between the sulfur-containing positive electrode sheet and the separation film. The application comprises that the conductive polymer film prepared from a conductive polymer, a conductive agent, and an adhesive is arranged as a conductive absorption layer between the sulfur-containing positive electrode sheet and the separation film of the lithium-sulfur battery, such that the lithium-sulfur battery is prepared. The prepared lithium-sulfur battery has the characteristics of high specific capacity, high coulombic efficiency, and long service life. The conductive polymer film has the advantages of low raw material cost, simple preparation method, and suitability for industrialized productions.

The invention relates to a production method of a boron nitride coated diaphragm of a lithium-sulfur battery. The diaphragm is produced from a commercial polypropylene diaphragm, two sides of the diaphragm are uniformly covered with hexagonal boron nitride, and the characteristics of hexagonal boron nitride 'white graphite' are used, so lithium ions are allowed to pass, shuttle of polysulfide anions is obstructed, a reaction of a lithium negative electrode with the polysulfide anions is inhibited, formation of lithium dendrites, lithium sulfide precipitate and fixed lithium is prevented, the capacity, the coulombic efficiency and the cycle stability of the lithium-sulfur battery are improved, the growth of the negative electrode metal dendrite in the cycle process is effectively inhibited, and the safety of the battery is improved. The method has the advantages of simple process route and clear purpose, and the produced diaphragm has multiple functions, and can greatly overcome disadvantages of present technologies.

The invention discloses a lithium-sulfur battery. The lithium-sulfur battery comprises three-dimensional porous graphene covalence fixing nanometer lithium sulfide as a composite positive electrode, a polyolefin membrane coated with graphene oxide as a modified membrane, and a lithium sheet negative electrode and an electrolyte which are generally adopted. The particle size of lithium sulfide in the composite positive electrode is between 1 nm and 100 nm, and the lithium sulfide is combined with oxygen-containing functional groups on the surface of three-dimensional porous graphene in the form of a C-O-S covalent bond. The modified membrane is prepared from graphene oxide with the thickness of 0.1 to 10 microns uniformly deposited on the surface of a traditional polyolefin membrane; and the graphene oxide can be coated on both sides of the polyolefin membrane, and can also be coated on the side facing the lithium sulfide positive electrode when the battery is assembled. According to the lithium-sulfur battery disclosed by the invention, the dissolution of the sulfur positive electrode can be effectively prevented, the shuttle effect is inhibited, the overpotential of the battery is reduced, the structural damage generated by positive electrode volume expansion is avoided, and the rate characteristic and cycle performance of the lithium-sulfur battery are substantially improved.

The invention provides a preparation method of an S / TiO2 composite material for an anode of a sodium-sulfur battery. The preparation method comprises the following steps: dissolving butyl titanate, a template agent and a hydrolysis inhibitor into absolute ethyl alcohol; adding a mixed solution of de-ionized water and the absolute ethyl alcohol to form semi-transparent sol; transferring the sol into a high-pressure reaction kettle to react; calcining a solid product in air to remove the template agent to obtain meso-porous titanium dioxide; dispersing the meso-porous titanium dioxide into a sodium thiosulfate solution dissolved with a surfactant; adding hydrochloric acid to react; washing the solid product by a lot of the de-ionized water and drying; and eating under the protection of an inert atmosphere to obtain the S / TiO2 composite material. The meso-porous titanium dioxide prepared by the preparation method is large in specific surface area, high in porosity and strong in adsorption capability; the electrical conductivity of sulfur can be improved and a lot of nano sulfur and polysulfide can be contained; the polysulfide can be effectively prevented from being dissolved and diffused in electrolyte, and the utilization rate of the sulfur is improved; meanwhile, the structure of the meso-porous titanium dioxide is stable and a pore channel cannot be easily damaged, so as to have buffering effects on volume expansion and retraction in a charging / discharging process of a sulfur electrode.

The invention discloses a sulfur-activated carbon / graphene composite material and an application thereof. The composite material is formed by loading sulfur on an activated carbon / graphene composite material or a material; and the sulfur-activated carbon / graphene composite material comprises the following components in percentage by mass: 10%-90% of sulfur and 10%-90% of activated carbon / graphene composite material. The sulfur-activated carbon / graphene composite material is used for a lithium-sulfur battery, so that, on one hand, the weight of the battery can be greatly reduced, the internal resistance of the battery is reduced, the conductivity of an electrode material is improved and the specific capacity and the overall performance of the battery are improved; and on the other hand, the shuttle effect is reduced, the influence of volume expansion of the sulfur on the performance of the battery is reduced to a certain extent and the utilization rate of the active material is improved. Under the same test condition, the overall performance of the lithium-sulfur battery assembled by the composite material as a positive electrode material is obviously superior to that of the lithium-sulfur battery assembled by the similar positive electrode material as the positive electrode material.

The invention discloses a polymer composite solid electrolyte and a preparation method and application thereof. The polymer composite solid electrolyte is prepared from polyphenylene sulfide, a lithium salt and an organic quinones electron acceptor and is taken as a polymer composite solid electrolyte of a lithium-sulfur battery, the polymer composite solid electrolyte, carbon black and elemental sulfur are fabricated to a composite sulfur electrode material, and thus, a novel lithium-sulfur battery system is formed. The high-molecular polymer composite solid electrolyte provides a relatively good lithium ion migration passage, the lithium ion conductivity of a composite positive electrode material is improved, the high-molecular polymer composite solid electrolyte has certain rigidity and toughness, the volume change of a positive electrode after charge and discharge of the lithium-sulfur battery is buffered, the discharge specific capacity of the lithium-sulfur battery is improved, and the cycle lifetime of the lithium-sulfur battery is prolonged.

The invention discloses a lithium anode for a high-specific-energy secondary battery. The lithium anode for the high-specific-energy secondary battery consists of a conductive substrate, a nanotube array, lithium metal and a barrier layer, wherein the nanotube array grows on the conductive substrate in an oriented manner; the lithium metal exists in the nanotube array; the barrier layer covers the nanotube structure. The lithium anode for the high-specific-energy secondary battery has the advantages that the lithium metal exists in a pipeline structure in a sealed manner, lithium dendrites can be prevented effectively, and a metal organic frame (MOF) which is rich in electrolyte or another lithium conducting material is used as the barrier layer, so that overgrowth of the lithium dendrites in local nanotubes can be prevented effectively, and the safety of the battery is ensured.

The invention discloses a preparation method of a lithium-selenium battery positive electrode. The preparation method of the lithium-selenium battery positive electrode comprises the following steps: depositing or growing a nitrogen-containing conductive polymer on the surface of a piece of paper, then carrying out alkaline activation and high-temperature carbonization to obtain a nitrogen-containing layered porous carbon compound current collector which takes a carbon fiber network structure as a self-supporting body, and further compounding the compound current collector with selenium to obtain the lithium-selenium battery positive electrode which is high in content of selenium, good in selenium fixation effect, high in mechanical performance and high in electrochemical performance. The preparation method of the lithium-selenium battery positive electrode is easy to operate, free from pollution and low in cost; the prepared lithium-selenium battery electrode is directly used for preparing a lithium-selenium battery with the high cycle performance and rate capability in the absence of an adhesive and a corresponding coating process.

The invention discloses a lithium-sulfur battery cathode material, a preparation method, and a lithium-sulfur battery, and belongs to the technical field of lithium-sulfur battery materials. The lithium-sulfur battery cathode material is a carbon-sulfur composite material, which is coated by a carbon cladding layer with a micro-porous structure. In the preparation method, under a vacuum condition, the raw materials are heated, just in one step, the sulfur and the carbon matrix are uniformly combined, the carbon precursor is carbonized, and the coating on the carbon-sulfur composite material is achieved. Compared with the conventional low-temperature coating method, the carbon cladding layer, which is carbonized at a high temperature and has a micro-porous structure, can form interactions just like the chemical bonds with the carbon-sulfur composite material; so that the micro-porous carbon cladding layer and the carbon-sulfur composite material are tightly combined together, thus the sulfur and discharge products cannot be easily dissolved in the electrolyte, the shuttling effect is prevented, the utilization rate of sulfur is improved, at the same time, the conductivity of the cathode material is better improved, and the cycle stability and capacity retention rate of the lithium-sulfur battery are both improved.

The invention relates to a positive electrode material of a lithium-sulfur battery and a preparation method for the positive electrode material, wherein the positive electrode material takes halloysite as a sulfur carrier; the preparation method comprises the steps of enlarging the inner diameter of the tube cavity of the halloysite by acid etching; then filling the tube cavity of the halloysite with sulfur by a liquid phase chemical deposition method and a thermal processing two-step method to form a halloysite / sulfur composite material; and then preparing and obtaining the halloysite-based lithium-sulfur battery positive plate. The halloysite is large in specific surface area, high in adsorption capacity and unique in the micropore structure, so that polysulfide generated in the charging-discharging process of the lithium-sulfur battery can be limited in the tube cavity of the halloysite, the volume expansion of sulfur in the charging-discharging process is restrained, and the capacity and the cycling stability of the battery are greatly improved; in addition, the preparation process is simple; and in addition, the halloysite nanotube is a natural environment-friendly material, low in cost and easily available, so that the industrial production of the lithium-sulfur battery can be realized conveniently.

The invention discloses a lithium-sulfur secondary battery system. The system comprises a positive electrode, a negative electrode and electrolyte, wherein an active substance of the positive electrode is a carbon-sulfur composite material, the negative electrode adopts a metal lithium plate, the electrolyte is high-salinity non-aqueous electrolyte, and the high-salinity non-aqueous electrolyte comprises lithium salt, sodium salt or lithium-sodium mixed salt and non-aqueous organic solvent; and the mol ratio of the lithium salt or the lithium-sodium mixed salt and the non-aqueous organic solvent is 2 to 10 mol / L. The lithium-sulfur secondary battery system has the following remarkable advantages that since the electrolyte system can effectively prevent multi-sulfur ions of the lithium-sulfur battery from being dissolved in the electrolyte in the charging and discharging processes, the multi-sulfur ions which are dissolved in the electrolyte can be prevented from producing a shuttle effect at the last stage of the charging, the over-charge phenomenon can be prevented, and the coulombic efficiency can be improved to be more than 99 percent. Therefore, the cycling performance of the battery also can be greatly improved.

A chargeable alkali metal-sulfur liquid flow battery comprises a positive electrode chamber portion, a diaphragm and a negative electrode chamber portion, wherein the positive electrode chamber portion comprises a positive electrode reaction chamber and a liquid storage tank communicated with a positive electrode chamber pipeline. The positive reaction chamber comprises a positive electrode collector and positive electrode sizing, and the positive electrode sizing used for a positive electrode circulates between the positive electrode reaction chamber and the liquid storage tank. The negative electrode chamber portion comprises a negative electrode reaction chamber comprising a negative electrode, a negative electrode collector and negative electrode electrolyte, and the diaphragm is a single-ion conductor diaphragm and is arranged between the positive electrode reaction chamber and the negative reaction chamber. Only one working ion rather than any other substances such as non-working ions is guaranteed to conduct between the positive electrode and the negative electrode. The positive electrode sizing is composed of positive electrode electrolyte and positive active matters mixed in the positive electrode electrolyte, and the positive active matters are one or more kinds of MxSy (M=Li or Na; 0(x< / =2; 0(y< / =12).

The invention provides a lithium-sulfur battery self-supporting cathode material and an electro-spinning preparation method thereof. Polyacrylonitrile and polymethyl methacrylate serve as precursors of electrostatic spinning yarns, composite nano-fiber membranes are prepared by an electro-spinning method, pre-oxidation and carbonization heat treatment of the electrostatic spinning fiber membranesare implemented to form a self-supporting in-situ nitrogen doped porous carbon nano-fiber structure, self-supporting in-situ nitrogen doped porous carbon nano-fiber membranes are soaked in carbon disulfide solution of sulfur, drying and heat treatment in the argon atmosphere are implemented to obtain the self-supporting lithium-sulfur cathode material. According to the material, the polymethyl methacrylate serves as a template agent, self-supporting in-situ nitrogen doped carbon nano-fibers with porous structures are formed in a heat treatment and pyrolysis manner, the loading capacity of thesulfur is improved, dissolution of polysulfide is restrained, and the nano-fibers can directly serve as electrode materials.

A positive electrode material for a lithium sulphur battery and a preparation method thereof, and the lithium sulphur battery are disclosed. The positive electrode material comprises activated carbon,carbon black, transition metal or a transition metal compound, and sublimed sulfur; and the transition metal compound is metal carbide, metal boride, metal nitride, metal phosphide, metal oxide or metal sulfide. The activated carbon is utilized as a main body of sulfur carrying; the carbon black can carry sulfur and can also strengthen the conductivity of the positive electrode material; and thetransition metal or the transition metal compound can play a fixation role in lithium polysulfide produced in an electrochemical reaction, inhibits the shuttle effect of polysulfide ions, and enablesthe cycle performance of the lithium sulphur battery to be improved. The positive electrode material for the lithium sulphur battery disclosed by the invention has the advantages of being simple and easy to obtain, easy to be prepared on a large scale, and the like, and the lithium sulphur battery with long circulation, high specific capacity and high specific energy can be obtained.

The invention belongs to the technical field of lithium ion battery separators, in particular to a preparation method of a modified separator for a lithium ion battery, and the method comprises the following steps: dissolving LiNO3, La (NO3)3 and ZrO(NO3)2 in deionized water, adding citric acid and ethylene glycol, evaporating to generate precursor gel, calcining to generate garnet powder, and sintering to obtain a garnet-type solid electrolyte LLZO; adding garnet-type solid electrolyte LLZO to a solvent, adding a binder and stirring to prepare a coating material; coating the coating materialon the surface of the separator, and drying at room temperature, thereby obtaining the lithium ion battery modified separator. The garnet-type solid electrolyte LLZO is coated on the separator as a coating layer, the pores of the separator are reduced in size, and the smaller pores can absorb more electrolyte under the capillary action; and the heat resistance of the separator is improved, the hydrophobicity of the separator is reduced, and the wettability of the separator to the electrolyte is better.

The invention relates to a method for preparing a lithium-sulfur battery cathode material, which relates to an electrode consisting of active materials. The method comprises the following steps of: firstly, preparing a multi-metal imidazole type molecular sieve framework TiO2-Co-ZIF-8 growing in a three-dimensional ordered titanium dioxide framework, then obtaining cobalt nano-particles TiO2-CNT-Co@NC coated with porous N-doped carbon and serially loaded on the three-dimensional ordered titanium dioxide framework through in-situ growth, and compounding the nano-particles and the with sublimedsulfur powder to obtain the S / TiO2-CNT-Co@NC lithium-sulfur battery cathode material. The method for preparing a lithium-sulfur battery cathode material overcomes the defects of low utilization rate of active substances, poor conductivity and shuttle effect in the prepared cathode material of the lithium-sulfur battery in the prior art.

The invention discloses a method for synthesizing a TiO2 / C (titanium dioxide / carbon) composite material on the basis of an MOF (metal organic framework) structure and application. The method comprises the following steps: (1) preparing a Ti-MOF by virtue of a hydrothermal method; (2) treating the Ti-MOF in a tube furnace to obtain the TiO2 / C composite material at high temperature under the protection of inert gas; (3) mixing the TiO2 / C composite material and elemental sulfur, performing heating melting under the protection of the inert gas, and cooling to room temperature to obtain a TiO2 / C / S composite material. According to the method, the TiO2 / C composite material is prepared by treating the MOF at high temperature, and the C has high electrical conductivity, so that problems about the insulativity of the elemental sulfur can be well solved; in addition, strong Lewis acid-base actions can be achieved by TiO2 which serves as a cathode material for a lithium-sulfur battery and a sulfur polymer, thereby inhibiting the shuttle effect of lithium polysulfide and improving the overall electrochemical performance of the lithium-sulfur battery.

The invention discloses a lithium sulfur battery positive electrode material and a preparation method thereof, wherein the lithium sulfur battery positive electrode material includes a sulfur carbon nano composite material, the sulfur carbon nano composite material includes carbon nanotubes, TiO2 nano particles and nano sulfur powder, the carbon nanotubes are intertwined to form micron grade carbon balls with nano micropore structures which are interconnected, the TiO2 nanoparticles areuniformly dispersed and embedded in the micron grade carbon balls to form composite carbon microspheres, and the nano sulfur powder is evenly filled in the composite carbon microspheres. Sulfur is infiltrated into the composite microspheres which are formed by coating of the TiO2 nanoparticles with the carbon nanotubes, and the lithium sulfur battery positive electrode material is prepared in a water-in-oil microemulsion system. The obtained material is a regular spherical structure with monodispersity and uniformity. After sulfur infiltration, the sulfur is uniformly filled into the microspheres, and the capacity is fully utilized during charging and discharging processes, and the structure can be controlled at the same time.

The invention discloses a preparation method of a lithium-sulphur battery electrode. The preparation method of the lithium-sulphur battery electrode comprises the following steps: putting a piece of paper into a titanate solution for dipping, drying the taken paper, and then putting the paper in water for carrying out hydrolysis reaction to obtain a nano-titanium dioxide complex loaded on the paper; putting the complex in a protection atmosphere for heating and cabonizing, adding a sulfurated carbon disulfide solution on the surface of a titanium dioxide complex current collector which is obtained by carbonizing and takes a carbon fiber network structure as a self support body, or soaking the surface of the titanium dioxide complex current collector which is obtained by carbonizing and takes the carbon fiber network structure as the self support body in the sulfurated carbon disulfide solution, drying and carrying out heat treatment to obtain the lithium-sulphur battery electrode which is high in mechanical performance, large in sulfur fixation amount and good in sulfur fixation effect. The electrode is directly used for preparing a lithium-sulphur battery with the excellent electrochemical performance and the high energy density in the absence of an adhesive and a corresponding coating process. The preparation method is easy to operate, environmentally-friendly, low in cost, liable to industrially implement and suitable for mass production.

The invention relates to a functional separator for a lithium sulfur battery, and a preparation method and application thereof, belonging to the technical field of electrochemistry. The functional separator of the invention is composed of a polymer separator matrix and a functional modification layer applied one side surface of the polymer separator matrix, wherein the functional modification layer comprises a binder, a conductive carbon material and a dendritic branched macromolecule. The adhesive of the invention has good adhesion and high stability. The conductive carbon material has a veryhigh electron conduction rate, can improve the utilization rate of the active substance and greatly reduce the internal impedance of the battery. The dendritic branch macromolecule contains more organic functional groups, the dendritic branched macromolecule has chemisorption to the polysulfide generated in the sulfur positive electrode region during the cycle, and the carbon material has physical adsorption to the dissolve polysulfide, thereby effectively inhibiting the shuttle effect in the lithium-sulfur battery. Therefore, the lithium sulfur battery prepared using the functional separatordescribed in the present invention exhibits excellent cycle performance and rate performance.

The invention discloses a multifunctional composite material based on graphene and polymer fibers and a preparation method and application of the multifunctional composite material. A three-dimensional fiber conductive network product with the polarity-rich surface and the core-shell structure is prepared by taking the non-woven fabric as a framework, thereby inhibiting the shuttle effect in the sulfur positive electrode simultaneously, and alleviating the dendritic crystal growth problem of the lithium negative electrode so as to improve the whole performance of the lithium-sulfur battery. The lithium-sulfur battery can be used in the fields of electrocatalysis, microbial fuel cells, polymer electrode membrane electrolysis and metal-air batteries due to the characteristics of high conductivity and high specific surface area so as to provide the advantages. The composite film product is obtained by reinforcing the graphene sheet with the non-woven fabric fiber yarns, has flexibility and remarkable heat conduction, electric conduction and electromagnetic shielding properties, and can ensure safe and long-acting use of related electronic equipment.

The invention relates to a carbon nitride composite material and a preparation method and an application thereof. The carbon nitride composite material comprises a substrate and a composite coating layer for covering the surface of the substrate; the composite coating layer comprises carbon nitride, a conductive agent and a binder; the conductive agent is selected from at least one kind of active carbon, acetylene black, Ketjen black, graphite, graphene and carbon nanotubes. The carbon nitride composite material can be applied to a diaphragm of a lithium-sulfur battery; when a polysulfide exists, the conductive agent can transfer electrons generated in the charge-discharge process, so that an effect of a second current collector as well as an effect of physical isolation can be played; in addition, carbon nitride has relatively high physical isolation effect and large specific surface area; and due to existence of the nitrogen element, shuttling of the polysulfide can be suppressed by the dual chemical and physical absorption effects effectively, thereby enabling the lithium-sulfur battery to be relatively high in discharge specific capacity and cycling stability.

The invention discloses a preparation method of a lithium-sulfur battery cathode material based on a phosphorus-doped graphene supported nickel phosphide material. The method comprises the following steps: (1) adding a surface active agent into graphene oxide to obtain graphene oxide dispersion liquid; (2) adding a nickel source and alkali liquor into distilled water to obtain a saline solution; (3) adding the saline solution into the graphene oxide dispersion liquid, carrying out a hydrothermal reaction, then washing, and carrying out freeze drying to obtain a graphene composite material loaded with a nickel precursor; (4) enabling the graphene composite material loaded with the nickel precursor to be subjected to a phosphating reaction so as to obtain the phosphorus-doped graphene supported nickel phosphide material; (5) compounding the phosphorus-doped graphene supported nickel phosphide material with sublimed sulfur to obtain the lithium-sulfur battery cathode material based on thephosphorus-doped graphene supported nickel phosphide material. The phosphorus-doped graphene supported nickel phosphide material prepared by the method has a three-dimensional space structure, thus having an obvious domain limiting effect on sulfur and remarkably inhibiting the shuttle effect of lithium polysulfide.

The invention belongs to the field of batteries, and concretely discloses an electrolyte carrier membrane. The electrolyte carrier membrane comprises a substrate polymer and mesoporous inorganic oxide particles, and the substrate polymer comprises poly(vinylidenefluoride-co-hexafluoro propylene) and organosilane-substituted polymethyl methacrylate. The invention also discloses an electrolyte which comprises the electrolyte carrier membrane and a liquid electrolyte adsorbed by the electrolyte carrier membrane. The invention also discloses preparation methods of the electrolyte carrier membrane and the electrolyte and a lithium ion battery. The provided electrolyte carrier membrane is good in pore uniformity, good in mechanical properties after a liquid is adsorbed, and good in compatibility with the electrolyte. The provided electrolyte is capable of effectively improving the capacity and the cycle performance of lithium-sulfur batteries.

The invention provides a modifying diaphragm for a lithium-sulfur battery and a preparation method thereof. The modifying diaphragm is prepared by well mixing a carbonized LIL-101-series metal organic frame material with a binder and coating the surface of a diaphragm with a mixture, and metal cations have quite strong adsorption effect on polysulfide, so that dissolution of polysulfide is prevented, and shuttle effect is inhibited effectively. A carbonized porous skeleton structure has high lithium ion conductivity, plays a role as a current collector and is conducive to quick conduction of ions. The modifying diaphragm presents excellent circulating performance and rate performance when being used for the lithium-sulfur battery. The preparation method is simple, low in cost, environment-friendly and has good industrial application prospect.

The invention provides a compound anode material, a preparation method of the compound anode material and an all-solid lithium-sulphur battery and belongs to the technical field of all-solid lithium ion batteries. The compound anode material is prepared from the following ingredients (in parts by weight): 10-90 parts of carbon-sulfur composite, 10-80 parts of Li10GeP2S12 electrolyte and 1-80 parts of conductive carbon material, wherein the carbon-sulfur composite comprises a carbon material and sulfur; and the sulfur is located on the surface of the carbon material. The compound anode material has the advantages of high rate specific discharge capacity, stable cycle performance and higher safety performance.

The invention relates to a preparation method of a network-like carbon-loaded iron-based compound material and an application of the network-like carbon-loaded iron-based compound material in a lithium-sulfur battery, and belongs to the field of electrochemistry; the method comprises the following steps of taking slightly oxidized graphene as a substrate, taking ferric nitrate nonahydrate as an iron source, taking glucose hydrothermal carbon as a carbon source of iron carbide and a pore-forming substrate, taking ammonia gas generated in the high-temperature pyrolysis process of melamine as a nitrogen source of an iron-nitrogen compound, and meanwhile, enabling ammonia to corrode the glucose hydrothermal carbon substrate to generate a net-shaped structure. The method has the beneficial effects that 1) the process is simple, and the product cost is low; 2) the obtained positive electrode material has a rich hole structure and ion and electron transport channels, the conductivity of the material can be improved, and the loss of the polysulfide compound can be effectively inhibited, the stability of the electrode material is remarkably improved, and the electrochemical performance is improved; and 4) the adsorption and catalysis of the polysulfide compound are achieved by utilizing the synergistic effect of the iron carbide and the iron-nitrogen compound, and the catalytic action can be used for accelerating the reaction dynamics of the lithium-sulfur battery, so that the transition of the soluble polysulfide compound to insoluble sulfide is accelerated, and the shuttle effectis greatly inhibited.