3700 results about "Ionic conductivity" patented technology

The invention discloses a composite polycrystalline positive electrode material which is prepared by permeating and coating a polycrystalline positive electrode material with an oxyhalide solid electrolyte, and the oxyhalide solid electrolyte comprises one or more of Li-Ta-O-Cl, Li-Nb-O-Cl, Li-Zr-O-Cl and Li-Al-O-Cl. The specific oxyhalide electrolyte is adopted to carry out permeation coating on the polycrystalline positive electrode material, uniform coating on the surface of the polycrystalline positive electrode material and grain boundaries in particles is completed, capacity utilization in the particles of the polycrystalline positive electrode material is achieved, and the capacity utilization rate of the particles of the polycrystalline positive electrode material is improved through the coating effect of the oxyhalide with high ionic conductivity. Ion transmission inside and in gaps of the polycrystalline positive electrode material particles is regulated, interface impedance is reduced, energy density is improved, and the application prospect is wide.

The invention provides a positive electrode, a low-temperature electrolyte, a low-temperature sodium-ion battery and a preparation method and application of the low-temperature sodium-ion battery, and belongs to the technical field of battery materials. The low-temperature sodium ion battery comprises a positive electrode, a negative electrode and a low-temperature electrolyte, wherein the positive electrode comprises a positive electrode active material, a binder, sodium salt containing fluorine and sulfur and conductive carbon; the positive electrode is improved by adding sodium salt containing fluorine and sulfur, sulfur / fluorine rich in anion derivatives can be formed on a contact interface of the positive electrode and an electrolyte to form a firm SEI film, the internal resistance of the battery is further reduced, and the coulombic efficiency of the battery during charging and discharging at normal and low temperatures is improved. The low-temperature electrolyte comprises an ester solvent and an ether additive, by adding the ether solvent, the physicochemical property of the electrolyte and the composition of an SEI film on a contact interface of an electrode and the electrolyte are optimized, the viscosity of the electrolyte at low temperature is reduced, the ionic conductivity is improved, and formation of the SEI film rich in sodium fluoride on the surface of a negative electrode can be promoted; and thus, the problem of low coulombic efficiency of battery charge-discharge cycle at low temperature is solved.

The present disclosure relates to the technical field of sodium-ion batteries, and in particular to an iron-based polyphosphate-type sodium-ion battery positive electrode material, a preparation method therefor and a use thereof. An organic ferrous source, a sodium source, a phosphorus source and a dopant are mixed and then ground until D50 is less than 180 nm, so that the reactivity of the material is improved, a solid-phase reaction is facilitated, and doped high-valence metal elements such as vanadium, niobium, titanium, zirconium and tin can be better doped into lattices of the iron-based polyphosphate-type sodium-ion battery positive electrode material (NFPP), so as to replace the iron site to form lattice defects such as vacancies, thereby improving the ionic conductivity of the material, inhibiting generation of NaFePO4 impurity phase, and improving the capacity and cycling stability of the material.

The invention discloses a phosphonic acid-based metal organic framework solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolyte materials. The method comprises the following steps: mixing a metal salt, an organic phosphonic acid ligand and an organic solvent, carrying out a coordination reaction, and treating to obtain MOF powder; heating and activating the MOF powder to obtain activated MOF powder; the method comprises the following steps: mechanically grinding lithium salt and MOF powder to form a mixture, heating to enable the molten lithium salt to permeate and fill MOF channels, and cooling to obtain solid electrolyte powder. The ionic conductivity of the solid electrolyte at 30 DEG C reaches 1.01 * 10 <-4 > S cm <-1 >, and the solid electrolyte is kept stable in a 4.4 V high-voltage window. The symmetrical battery based on the phosphonic acid-based MOF solid electrolyte can stably operate, and shows excellent compatibility and stability of the electrolyte and a lithium metal negative electrode. The method has the advantages of simple operation, cheap and easily available components, and is expected to be suitable for large-scale preparation.

The invention relates to a polymer binder for a sulfide solid-state battery as well as a preparation method and application of the polymer binder. The binding agent is formed by copolymerizing vinyl triethoxy silane, 4-vinyl phenylboronic acid lithium and styrene. Silane groups are introduced, the interface adhesiveness with sulfide electrolyte is enhanced through the coupling effect of the silane groups, meanwhile, water in a system is consumed through a condensation reaction, and the water content of an electrolyte membrane is reduced; 4-vinyl phenylboronic acid lithium provides dissociation lithium ions, the ionic conductivity of the binder is improved, and the negative influence on the conductivity of sulfide electrolyte is reduced; the styrene group improves the solubility of the binder in a non-polar solvent. The binder can be dissolved in solvents such as toluene, xylene and the like, and is mixed with sulfide electrolyte to form a film through a wet coating process, and the process compatibility is high. The binder disclosed by the invention has the characteristics of high cohesiveness, ionic conductivity and low water content, and the interface stability and electrochemical performance of the sulfide solid-state battery can be remarkably improved.

The invention relates to an inorganic sodium ion solid electrolyte material screening method, system, equipment and medium, sodium-based inorganic compound data is extracted from an open source material database, and a candidate library is formed through preliminary screening; constructing a regression model by using training data of the dynamic solid electrolyte database, and optimizing and selecting an optimal machine learning model; inputting the preliminary candidate library into the model, and predicting and screening out a preliminary screening material of which the ionic conductivity is higher than a first threshold value; performing simulation calculation on the primarily screened material based on a first principle, simulating sodium ion diffusion tracks at different temperatures by using de novo molecular dynamics, calculating a diffusion coefficient, and extrapolating the diffusion coefficient to ionic conductivity at room temperature; and comparing the electrical conductivity predicted by machine learning and the electrical conductivity simulated by the first principle, and selecting a material of which the two electrical conductivity are both higher than a second threshold value and the migration energy barrier is relatively low as the optimal sodium ion solid electrolyte. Compared with the prior art, the method can efficiently and accurately screen out the high-performance sodium ion solid electrolyte material.

The invention belongs to the technical field of solid-state lithium batteries, and relates to a fluorinated double-salt cross-linked solid-state electrolyte adaptive to a lithium-free negative electrode, a solid-state lithium battery and a preparation method thereof.The preparation method comprises the steps that double-lithium salt is dissolved in a fluorinated solvent to obtain an electrolyte, then a monomer, a cross-linking agent and an initiator are added, the mixture is stirred to be uniform to obtain a precursor solution, and the precursor solution is prepared; and assembling the precursor solution, a positive electrode, a negative electrode and a solid-state electrolyte composite diaphragm into a battery, and performing gradient polymerization to form the solid-state lithium battery. According to the invention, the ionic conductivity of the solid electrolyte is more than 5 * 10 <-4 > S / cm and the oxidation potential of the solid electrolyte is more than 5.8 V by adopting a fluorinated solvent consisting of fluorinated carbonate and fluorinated carboxylate and a double-lithium-salt synergistic system and combining an in-situ interface fusion technology, so that the solid electrolyte can be matched with a 4.8 V high-voltage lithium-rich manganese-based positive electrode and a lithium-free negative electrode; and the energy density and the safety of the solid-state lithium battery are improved. The electrolyte scheme is low in cost, high in safety and good in positive and negative electrode matching performance, can be compatible with an existing battery production line, and is convenient for large-scale production.

The invention discloses a preparation method of a lithium-phosphorus-sulfur-bromine solid-state electrolyte, and relates to the technical field of solid-state lithium batteries. The material is subjected to raw material pretreatment, mechanochemical ball milling, high-temperature crystallization treatment and post-treatment processes, so that the solid electrolyte with high crystallinity, high ionic conductivity and good processability is obtained. According to the method, dynamic bromine atmosphere control is adopted, sulfur partial pressure adjustment and particle size gradient design are combined, and the structural stability and the ion transmission performance of the material are improved.

The invention discloses a single-ion conductor polymer, a ternary composite binder solution, high-solid-content sulfide electrolyte slurry and a wet film forming method and application thereof, and belongs to the technical field of all-solid-state lithium batteries. The key technical problems in the wet membrane preparation of the sulfide electrolyte are solved through an innovative solvent-binder synergistic system, and the method specifically comprises the steps that 1, through the synergistic effect of a non-polar solvent and a weak-polar solvent, low-viscosity coating of high-solid-content slurry is achieved while the chemical stability of the sulfide electrolyte is guaranteed; 2, a poly (lithium styrenesulfonate-butyl acrylate), styrene butadiene rubber and polyisobutene ternary composite binder is designed, a lithium ion transmission channel is provided through a lithium sulfonate group, a benzene ring structure in the styrene butadiene rubber enhances the mechanical strength, long-chain alkane in the polyisobutene improves the interface adhesive force, and the mechanical strength is improved; the three components cooperate to realize balance of mechanical and electrochemical properties of the electrolyte membrane, so that the prepared electrolyte membrane has low porosity, high ionic conductivity and mechanical strength.

The invention relates to the technical field of supercapacitors, and provides a cement-based supercapacitor, a preparation method and application. The cement-based supercapacitor comprises a cement-based electrolyte and two structural electrodes arranged on the two sides of the cement-based electrolyte. The cement-based electrolyte is prepared from cement, alkali, alkali metal salt, water and an additive, wherein the alkali metal salt comprises lithium salt; each structural electrode is composed of foamed nickel loaded with nitrogen-doped reduced graphene oxide. The lithium salt is added to construct an efficient ionic conductive network, so that the ionic conductivity of the cement-based electrolyte is enhanced, and the electrochemical performance is obviously improved. The reduced graphene oxide in the structural electrode is doped with nitrogen to enhance the electrostatic force between ions and the surface of the electrode, so that the electrochemical stability of the surface of the electrode is improved, and self-discharge is effectively inhibited. By improving an electrolyte and a structural electrode material, a cement-based supercapacitor with specific capacitance and mechanical properties is obtained and is combined with a building structure to realize building energy storage.

The invention discloses a preparation method and application of a sulfide solid electrolyte membrane based on a gradient polymer / ionic liquid composite binder, and an all-solid-state battery, and belongs to the technical field of all-solid-state batteries. The method comprises the following steps: firstly coating a polymer / ionic liquid / sulfide electrolyte composite layer through a gradient coating process, filling particle gaps under low pressure by utilizing the plasticizing effect of ionic liquid, and reducing the porosity of an interface; and then coating a polymer / sulfide electrolyte surface layer to provide mechanical support and inhibit side reaction of the electrode. According to the design, the electrolyte membrane still keeps high ionic conductivity under the working pressure of a commercial power battery module, and the interface impedance is reduced compared with that of a traditional homogeneous membrane. Through the innovative gradient structure and material combination, the ion transmission bottleneck of the sulfide electrolyte under the low-pressure condition is solved, excellent interface stability and process compatibility are achieved, and a key technical scheme is provided for all-solid-state battery industrialization.

The present disclosure provides a solid electrolyte composition that can suppress deterioration in ion conductivity of an ionic solid electrolyte material. The solid electrolyte composition according to the present disclosure contains a sulfur element-free ionic solid electrolyte material and an organic solvent, where the organic solvent includes at least one selected from the group consisting of a hydrocarbon and a compound having a functional group; and the functional group is at least one selected from the group consisting of an ether group, a halogen group, and a Si—O—C group.

The invention provides a composite solid electrolyte and a preparation method thereof, and belongs to the technical field of solid electrolyte materials. The solid electrolyte powder, the photosensitive resin monomer, the lithium salt, the plasticizer and the photoinitiator are used as raw materials to prepare the composite solid electrolyte, the plasticizer can be inserted between polymer chains, the compatibility of the solid electrolyte powder and a polymer is improved, electrode interface contact is improved, the flexibility of the composite solid electrolyte is improved, and the service life of the composite solid electrolyte is prolonged. The ionic conductivity of the composite solid electrolyte is further improved; the photosensitive resin monomer and the photoinitiator can be subjected to photopolymerization in-situ curing, so that the composite solid electrolyte has better mechanical property and flexibility, electrode interface contact is improved, and the ion conductivity is improved.

The invention provides a modified lithium sulfide solid electrolyte, a sulfide solid electrolyte, a preparation method thereof and a battery, and relates to the technical field of solid electrolyte materials. The preparation method of the sulfide solid electrolyte is different from a traditional doping technology, the high-stability sulfide solid electrolyte is prepared mainly through modification of lithium sulfide, the comprehensive performance of the sulfide solid electrolyte is improved, the ionic conductivity and chemical stability of the sulfide solid electrolyte are improved, and the service life of the sulfide solid electrolyte is prolonged. And the mechanical strength and the crack resistance are also obviously enhanced. The preparation method disclosed by the invention is simple, does not need to be carried out at high temperature, and does not need to use expensive raw materials and complex processes, so that the production cost is reduced, the application range of the sulfide solid electrolyte is expanded, and large-scale production and application of the sulfide solid electrolyte are favorably realized.

The invention relates to a solid electrolyte coated silicon-carbon negative electrode material and a preparation method thereof, an all-solid-state battery and an electric device, and belongs to the technical field of methods or devices for directly converting chemical energy into electric energy. The solid electrolyte coated silicon-carbon negative electrode material comprises a silicon-carbon negative electrode material and a solid electrolyte coating layer arranged on the surface of the silicon-carbon negative electrode material, the solid electrolyte coating layer comprises at least one of sulfide electrolyte and halide electrolyte; the silicon-carbon negative electrode material comprises an inner core and a carbon coating layer arranged on the surface of the inner core, the inner core comprises a porous carbon matrix and a silicon-based material positioned in pores of the porous carbon matrix. The solid-state electrolyte coated silicon-carbon negative electrode material enables an all-solid-state battery to have high ionic conductivity and first efficiency and excellent cycling stability.

The invention belongs to the technical field of design and preparation of solid electrolyte materials, and particularly relates to a LiBH4-based composite solid electrolyte material and a preparation method thereof.The LiBH4-based composite solid electrolyte material is obtained by performing high-energy ball milling on a mixture of LiBH4 and one or two metal halides MX2 in a certain molar ratio in an argon atmosphere; m is Mg, Zn, Ni or Bi; x is F, Cl, Br or I. According to the LiBH4 composite solid electrolyte prepared by the preparation method disclosed by the invention, the ionic conductivity at room temperature is improved to 10 <-4 > S cm <-1 > or above, and the ion diffusion activation energy is only 0.16 eV; the process is simple, the preparation time is short, the repeatability is high, no pollution is caused to the environment, and the industrial production requirement is met, so that the all-solid-state lithium ion battery electrolyte is expected to realize commercialized application.

The present disclosure provides a solid electrolyte composition that can suppress deterioration in ion conductivity of an ionic solid electrolyte material. The solid electrolyte composition according to the present disclosure contains a sulfur element-free ionic solid electrolyte material and an organic solvent, where the organic solvent includes at least one selected from the group consisting of a hydrocarbon and a compound having a functional group; and the functional group is at least one selected from the group consisting of an ether group, a halogen group, and a Si—O—C group.

The invention provides an aerogel reinforced composite electrolyte thin film for a solid-state lithium battery and a preparation method of the aerogel reinforced composite electrolyte thin film, and belongs to the technical field of composite electrolytes.The thin film comprises a three-dimensional porous aerogel skeleton, a solid-state electrolyte compound and lithium salt nanocrystals; wherein the three-dimensional porous aerogel skeleton is prepared from inorganic oxide nanoparticles and a polymer precursor through a sol-gel method; pores of the three-dimensional porous aerogel skeleton are filled with the solid electrolyte compound, the solid electrolyte compound comprises lithium lanthanum zirconium oxide nanowires and a polyoxyethylene-lithium salt composite matrix, and the lithium lanthanum zirconium oxide nanowires are directionally arranged in the thickness direction of the film; the lithium salt nanocrystals grow on the surface of the pore wall of the three-dimensional porous aerogel in situ; the mass ratio of the aerogel skeleton to the solid electrolyte compound is (1: 3)-(1: 15). According to the thin film, the ionic conductivity, the mechanical strength and the interface stability of the electrolyte are remarkably improved.

The invention relates to a modified current collector for a cathode-free metal battery and a preparation method and application thereof.The preparation method comprises the steps that an in-situ modification reaction is conducted on the surface of a copper current collector to obtain a current collector coated with a copper oxide nanometer material, and then selenium is introduced to the surface of the current collector coated with the copper oxide nanometer material through a partial in-situ substitution reaction to obtain the modified current collector coated with the copper oxide nanometer material. The preparation method comprises the following steps: preparing a copper selenide and copper oxide composite modified current collector, performing in-situ lithiation reaction through electrochemical deposition, and partially converting to generate corresponding lithiates, thereby obtaining the modified current collector for the non-anode metal battery. According to the invention, the functional artificial interface layer with lithium affinity, high stability and high ionic conductivity is constructed on the surface of the copper-based current collector in situ, so that the key problems of uneven metal deposition and unstable SEI layer on the surface of the negative electrode current collector in the current research of the metal secondary battery without the negative electrode are solved, the formation of dendritic crystals and the occurrence of side reactions are inhibited, and the service life of the metal secondary battery is prolonged. Therefore, the coulombic efficiency, the safety and the cycle life of the battery are improved.

The invention relates to the technical field of solid-state electrolytes, and discloses a high-ionic-conductivity solid-state electrolyte, a preparation method thereof and a solid-state battery. The preparation method comprises the following steps: mixing lithium sulfide, lithium chloride, lithium oxide, phosphorus pentasulfide and boron nitride in an inert atmosphere to obtain a mixture; carrying out ball milling on the mixture to obtain precursor powder; and sintering the precursor powder, and dispersing the sintered precursor powder to obtain the high-ionic-conductivity solid electrolyte. The boron element, the nitrogen element and the oxygen element are introduced into a lithium phosphorus sulfur chlorine system as doping elements, lattice parameters of LPSC are changed through the boron element, the rotation rate of a PS4 / BS4 tetrahedron is enhanced, and a lithium ion diffusion channel is optimized, so that the lithium ion transition activation energy of the electrolyte is reduced, the migration rate of lithium ions is increased, and the performance of the electrolyte is improved. Therefore, the solid electrolyte has high ionic conductivity. The introduced nitrogen element and oxygen element can interact with atoms such as sulfur and phosphorus, the electron cloud distribution of anion groups is adjusted, the interaction energy of lithium ions and the anion groups is reduced, the lithium ion transmission performance is further improved, and the electrochemical stability of the anion framework is enhanced. This makes it possible to increase the energy density of an all-solid-state battery when used in a solid-state battery.

The invention provides a coated modified high-nickel ternary positive electrode material, a preparation method and a lithium ion battery, the coated modified high-nickel ternary positive electrode material comprises a high-nickel ternary matrix and a coating layer containing an oxide solid electrolyte, the coating layer is coated outside the high-nickel ternary matrix and accounts for 1%-3% of the mass of the high-nickel ternary matrix; the oxide solid electrolyte comprises Li < 3x > La < 2 / 3-x > TiO < 3 > (0 lt; x < = 0.16), Li < 7 > La < 3 > Zr < 2 > O < 12 >, Li < 1 + y > Al < y > Ti < 2-y > (PO < 4 >) < 3 > (0 lt; y < = 0.5); the ionic conductivity of the oxide solid electrolyte is greater than or equal to 1 * 10 <-4 > S / cm. The selected oxide solid electrolyte has high ionic conductivity and electronic insulativity, a rapid lithium ion transmission channel can be provided, interface side reaction can be inhibited, the rate capability and the cycling stability of the material can be remarkably improved, and when the oxide solid electrolyte forms a coating layer, the coating layer is not prone to deformation, and the service life of the material is prolonged. The interface bonding strength with a high-nickel ternary matrix can be improved through chemical bonding, the interface impedance can be remarkably reduced, and the dynamic performance of the material is improved.

The invention relates to the technical field of new energy battery materials, in particular to a surface-coated sulfide solid electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing and stirring a sulfide solid electrolyte and a first solvent to obtain a first mixed solution; mixing and stirring nanoparticles with oxygen-containing functional groups and a second solvent to obtain a second mixed solution; adding the second mixed solution into the first mixed solution, and stirring to obtain a third mixed solution; and carrying out vacuum drying on the third mixed solution to obtain the surface-coated sulfide solid electrolyte. The sulfide solid electrolyte is subjected to surface particle coating through simple mixing and vacuum drying, oxygen-containing functional groups are attached to the surfaces of the particles, so that the material is more oxygen-loving, the air stability of the sulfide solid electrolyte is improved, and the material still keeps high ionic conductivity and has good electrochemical performance. And moreover, the machining process is reduced, the machining cost is reduced, and the practical application value is higher.

The invention provides gel with a three-dimensional network structure, a preparation method of the gel and a lithium battery, and belongs to the technical field of lithium batteries. The gel provided by the invention comprises the following raw materials: polyethylene glycol dimethacrylate (PEGDMA) and / or a derivative thereof, a fluorine-containing carbonate compound, a cross-linking agent, a lithium salt, a flame retardant and an organic solvent. The PEGDMA and / or the derivative thereof and the fluorine-containing carbonic ester compound generate a three-dimensional network structure under the action of the cross-linking agent, the fluorine-containing carbonic ester compound can improve the interface stability between the gel and the electrode material, reduce the interface side reaction and improve the thermal stability of the gel, and the performance of the electrode material is improved. Meanwhile, the three-dimensional network structure has relatively high porosity and liquid absorption capacity, so that an ion transmission channel is improved, and the ionic conductivity of the gel is further improved. The room-temperature ionic conductivity of the gel with the three-dimensional network structure is larger than or equal to 3 mS / cm, and the thermal decomposition initial temperature is larger than or equal to 250 DEG C.

The invention provides a modified alkaline electrolytic water hydrogen production diaphragm and a preparation method thereof. The modified diaphragm comprises a base membrane loaded with a Cu < 2 + > complexed chitosan alkali-resistant ion conduction unit, and the Cu < 2 + > complexed chitosan alkali-resistant ion conduction unit is obtained by loading chitosan through the base membrane and soaking in a Cu < 2 + > complexed solution for complexing. By introducing a copper-chitosan complex structure, a stable ionic conduction channel is constructed in an alkaline environment, and the alkali resistance and ionic conductivity of the membrane are effectively improved. According to the modified alkaline diaphragm for hydrogen production by electrolysis of water, the problems of insufficient alkali resistance, limited ion transmission capability and the like of a diaphragm material in the prior art are solved, and a new solution is provided for preparing the diaphragm for hydrogen production by electrolysis of alkaline water with long service life, high efficiency and low cost.

The embodiment of the invention provides an electrolyte, a battery and a power utilization device, the electrolyte comprises a lithium salt, a first additive and a second additive, the lithium salt comprises lithium hexafluorophosphate, the second additive is lithium fluorosulfonate, and the first additive has a structure as shown in a formula (1). The first additive and the second additive have a synergistic effect, an organic-inorganic composite CEI film is formed on the positive electrode, meanwhile, an inorganic SEI film with high ionic conductivity is formed on the negative electrode, and the CEI film and the SEI film can reduce side reactions between the electrode and an electrolyte, so that damage to the surface structure of the electrode and decomposition gas production of the electrolyte are reduced, and the service life of the electrolyte is prolonged. The cycle performance of the battery is improved; and the inorganic SEI film with high ionic conductivity can improve the transmission rate of conductive ions, so that the power performance of the battery is improved, and the battery has relatively good cycle performance and power performance.

The invention provides a modified lithium iron manganese phosphate positive electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of lithium ion battery materials. The positive electrode material comprises a phosphorus source, an iron source, a manganese source, a lithium source and a magnesium source. Mixing a titanium source solution, carrying out hydrothermal reaction, centrifugally washing and drying to synthesize the lithium manganese iron phosphate, and coating polypyrrole and a glucose carbon layer to improve the electronic conductivity of the lithium manganese iron phosphate. The magnesium-titanium co-doped stable crystal structure is introduced, the lithium ion diffusion path is shortened, the dissolution of the manganese element is inhibited, the structural change in the charging and discharging process is reduced, the side reaction with the electrolyte is inhibited by coating the cobalt boride, and the electrochemical performance of the lithium manganese iron phosphate is improved. The primary nano-particles improve ionic conductivity, and the secondary nano-particles are nano-particles formed by assembling the primary nano-particles and have the advantages of being good in rate capability, high in compaction density and high in tap density.

The invention discloses a preparation method and application of a composite sulfur positive electrode packaged by a sulfide-halide composite electrolyte spherical shell. The composite sulfur positive electrode packaged by the sulfide-halide composite electrolyte spherical shell provided by the invention has a core-shell structure, the inner core is a sulfur-carbon composite material, and the outer layer is a sulfide-halide composite electrolyte shell; the sulfur volume change effect in the charging and discharging process can be effectively relieved, uniform stress distribution and effective contact in the composite positive electrode are ensured, and the utilization rate of positive electrode active substances and the overall energy density of the battery are improved. Meanwhile, the composite sulfur positive electrode provided by the invention has high ionic conductivity at room temperature, can significantly improve the reaction kinetics of the positive electrode and improve the capacity and rate capability of the battery, can be used for assembling and preparing a solid-state lithium-sulfur battery, has good safety performance and high energy density, and has a wide application prospect.

The invention provides a solid electrolyte material screening method based on a physical constraint diagram attention network, and the method comprises the steps: calculating an ionic conductivity parameter corresponding to a solid electrolyte material through dynamic Monte Carlo simulation, and constructing an initial data set containing a mapping relation between a crystal structure and ionic conductivity; constructing a physical constraint graph attention network prediction model; performing iterative training and hyper-parameter adjustment on the physical constraint graph attention network prediction model by adopting the initial data set based on cross validation and Bayesian optimization to obtain an optimal physical constraint graph attention network prediction model; a novel crystal structure is generated through a generative large language model, and a candidate material data set is constructed; and taking the candidate material data set as input, utilizing the optimal physical constraint diagram attention network prediction model to predict the ionic conductivity of the material, and screening to obtain the solid electrolyte material with high ionic conductivity. The method breaks through the inherent mode that a traditional prediction method is limited to known materials, the material exploration space is greatly expanded, and development of solid electrolyte key materials is accelerated.

A system and method are provided for a machine-learning drive framework for predicting ionic conductivity of solid-state electrolytes. In use, the method and / or system may include receiving, at a machine learning system, two or more molecular structures from at least one structural dataset, where the two or more molecular structures relate to ionic mobility. Additionally, atomic weights are calculated for the two or more molecular structures, and the machine learning system is trained based on the two or more molecular structures, where the training relies on at least one intrinsic atomic feature and the calculated atomic weights for the two or more molecular structures. Further, a bias-correction is applied for the two or more molecular structures to improve the training of the machine learning system. Further, one or more molecular dynamics (MD) simulations are outputted, using the machine learning system, for the two or more molecular structures.

The invention relates to a PEO-based organic-inorganic composite solid electrolyte membrane and a preparation method thereof. The electrolyte membrane is prepared by heating and curing a blend solution of a PLA organic solution and a PEO / LITFSI / LATP mixed solution. The PEO-based organic-inorganic composite solid electrolyte membrane and the preparation method thereof provided by the invention have the effects that due to the existence of the PLA / PEO blending system, the degradability of the solid electrolyte can be realized, and the mechanical property of the solid electrolyte can be enhanced. In addition, the inorganic lithium salt and the organic lithium salt are mixed, so that the solid electrolyte is endowed with excellent ionic conductivity, and the mechanical property of the solid electrolyte is further improved. Therefore, the PEO-based organic-inorganic solid electrolyte and the preparation method thereof provided by the invention can bring important contributions to high energy density, long cycle life and excellent safety performance of an all-solid-state battery.