4424 results about "Solid-state battery" patented technology

A battery pack includes a battery housing; a battery module disposed in the battery housing, where the battery module includes multiple battery cells, and at least one of the battery cells is a solid-state battery; and a control circuit disposed in the battery housing and configured to use the battery module to supply the electric power to the power tool. The energy W of the battery pack and the volume V1 of the battery pack satisfy the following: when the energy W is greater than or equal to 200 Wh, the volume V1 is less than or equal to 400 cm3; or when the energy W is greater than or equal to 300 Wh, the volume V1 is less than or equal to 800 cm3; or when the energy W is greater than or equal to 700 Wh, the volume V1 is less than or equal to 2500 cm3.

The invention discloses a solid-state battery performance testing method and system based on data analysis, and relates to the field of battery performance testing, and the method comprises the steps: building a multi-physics field coupled digital twinborn model, collecting a strain signal and temperature field distribution of a failure region according to a three-dimensional physics field state map of the failure region, and when abnormally abruptly changed, carrying out the testing of the performance of a solid-state battery. Triggering multi-stage early warning, matching physical failure evidences with a historical database, extracting an optimal test parameter combination through a meta-learning framework, dynamically adjusting a charging and discharging strategy and monitoring frequency, generating a real-time data stream, and updating parameters of a multi-physics field coupled digital twin model through a back propagation algorithm. According to the method, the test parameters are dynamically optimized through the meta-learning framework, the performance of the solid-state battery is monitored and predicted, the safety and the reliability of the solid-state battery are improved, and a charging and discharging strategy is optimized to prolong the service life of the battery.

The present invention provides a composite binder for a sulfide solid-state battery, a preparation method thereof and an application thereof, wherein the composite binder comprises a binder A, a binder B and a solvent, wherein the mass ratio of the binder A to the binder B is (1-10):(5-1), and the mass ratio of the total mass of the binder A and the binder B to the solvent is 1:(10-100). The present invention adopts a binder having a polar functional group and a low-polarity / non-polar binder for combination, thereby making the prepared composite binder have good compatibility with the sulfide solid electrolyte, that is, it does not affect the ionic conductivity of the sulfide solid electrolysis, and at the same time makes the sulfide solid electrolyte membrane have good mechanical properties and flexibility.

The invention relates to a high-voltage-resistant deep eutectic-based in-situ polymerization solid electrolyte as well as preparation and application thereof. The in-situ polymerization solid electrolyte is obtained through an in-situ polymerization reaction of a precursor solution comprising 30-80 wt% of a deep eutectic solution, 10-50 wt% of a polymerizable monomer, 1-30 wt% of an additive and 0.05-10 wt% of an initiator; the deep eutectic solution comprises a lithium salt and a hydrogen bond donor organic solvent; the hydrogen bond donor organic solvent comprises a nitrile solvent and a non-nitrile solvent; the polymerizable monomer comprises a monomer for free radical-initiated polymerization or ring-opening polymerization; the additive comprises lithium nitrate and fluoroethylene carbonate. The high-voltage-resistant in-situ polymerization solid electrolyte formed by in-situ compounding of an organic framework formed by in-situ polymerization of a deep eutectic solution, an additive and a monomer has the excellent characteristics of wide electrochemical window, high ionic conductivity, high mechanical strength, good flame retardance, wide-temperature applicability and the like, and can be suitable for a high-voltage system of 4.6 V or above; the solid-solid contact problem of a solid-state battery interface is effectively solved, and the side reaction between the electrolyte and the lithium metal negative electrode is reduced.

The invention provides an all-solid-state battery, a preparation method thereof and electric equipment. The all-solid-state battery comprises a positive plate, a negative plate and an electrolyte layer positioned between the positive plate and the negative plate, the positive plate comprises a positive current collector layer and a positive active material layer, one side of the positive active material layer is coated with an insulating layer at an interval, and the circumferential edge of the negative plate is in lap joint with the insulating layer. The all-solid-state battery can improve the insulation performance in the using process, and the effect of reducing the risk of short circuit is achieved.

The invention discloses a difunctional filler synergistically enhanced polymer solid electrolyte and a solid-state battery, and belongs to the field of solid-state batteries. The electrolyte adopts a polymer matrix, a lithium salt and two functional fillers: the first filler has a high dielectric constant, and can accelerate dissociation of the lithium salt, fix negative ions of the lithium salt and improve the transference number of lithium ions under the action of self polarization; and the second filler has high electrochemical window and ionic conductivity, can inhibit high-voltage decomposition, and is adaptive to a high-voltage positive electrode material. Through cooperation and balance design of the two kinds of filler, ion transmission, interface stability and high-pressure compatibility can be considered at the same time. In addition, the invention further designs a composite negative pole piece, the surface of the negative pole piece is coated with the solid electrolyte, and the ion transmission kinetics in the pole piece can be remarkably improved. On the basis, the invention develops a high-performance solid-state battery which is excellent in electrochemical performance and can play an important role in the fields of consumer electronics, electric automobiles, energy storage systems, low-altitude flight and the like.

The present invention relates to an all-solid-state battery (ASSB) comprising: an anode comprising a first solid electrolyte; a cathode composite comprising a second solid electrolyte, a solid electrolyte selected from the first and second solid electrolytes, and at least one buffer layer in contact with a surface of the solid electrolyte, where when the solid electrolyte is the first solid electrolyte, one buffer layer is at an interface of the electrolyte with the cathode, and when the solid electrolyte is the second solid electrolyte, one buffer layer is at least one of the first solid electrolyte and the second solid electrolyte. And when the solid electrolyte is a second solid electrolyte, a buffer layer is at the interface of the electrolyte and the anode, where the first electrolyte is selected from a sulfide solid electrolyte and a lithium oxide solid electrolyte, where the second electrolyte is a halide solid electrolyte, and where the buffer layer has a thickness of from 0.5 nm to less than 10 nm. The invention also relates to an anode assembly, a cathode assembly and an electrolyte assembly comprising at least one buffer layer. The invention also relates to a method for producing an ASSB or component according to the invention, in which the buffer layer is deposited by a vapor deposition-based method.

The embodiment of the invention provides a synthesis method and application of lithium sulfide. The synthesis method of the lithium sulfide comprises the following steps: providing a sulfur source and a lithium source; performing first treatment on the sulfur source to obtain sulfur vapor; performing second treatment on the lithium source to obtain molten metal lithium; and in an inert atmosphere, introducing the sulfur vapor into the molten metal lithium, and reacting to generate lithium sulfide. According to the synthesis method and application of the lithium sulfide provided by the embodiment of the invention, the sulfur source is converted into the sulfur vapor, the lithium source is converted into the molten metal lithium, and the gas-liquid out-phase reaction is carried out in the inert atmosphere, so that the reaction efficiency and the purity are improved, the process is simplified, the cost is reduced, and the high-purity requirement can be met; the purity can be improved through raw material pretreatment of sulfur steam and molten metal lithium, and the strict requirement of a solid-state battery for high-purity lithium sulfide is met.

The invention belongs to the technical field of solid-state battery materials, and discloses an inorganic solid-state electrolyte lanthanum lithium zirconate surface interface non-metallic element doped modified material using a plasma technology and a preparation method and application thereof, which can reduce the interface impedance of an electrolyte and improve the electrochemical performance of the electrolyte. By using the plasma technology, impurities such as lithium carbonate and the like on the surface of the inorganic solid electrolyte lanthanum lithium zirconate can be etched, a lithium-loving protective layer can be generated in situ on a surface interface, and the air stability of the electrolyte block is improved. According to the invention, multi-aspect modification can be realized by combining a plasma technology with a plurality of non-metallic element excitation sources, corresponding gain protection layers can be formed according to different requirements, and performance exertion of the battery in different fields is facilitated. When the inorganic solid electrolyte lanthanum lithium zirconate modified material obtained by the method disclosed by the invention is in contact with lithium metal to form a battery, the inorganic solid electrolyte lanthanum lithium zirconate modified material shows relatively low interface contact resistance and excellent cycling stability, and has a good application value.

The invention relates to the technical field of solid-state batteries, in particular to oxyhalide solid-state electrolyte as well as a preparation method and application thereof. The method comprises the following steps: taking molten salt LiaMbXc as a raw material, reacting with an oxide AdOf in a molten state, removing steam impurities by utilizing a high-temperature vacuumizing mode, and cooling to prepare the oxyhalide solid electrolyte; according to the invention, the molten salt raw material is molten at high temperature to form the ion melt, and the oxygen element is introduced to replace part of halogen, so that the hardness of the target electrolyte is reduced after cooling, the deformability at room temperature is improved, and the obtained electrolyte is high in conductivity and wide in antioxidant electrochemical window. The prepared oxyhalide solid electrolyte is used for preparing a positive electrode, the adhesion force between the electrolyte and positive electrode material particles, the actual microscopic contact area and the ion migration rate are improved through melt permeation, the problem of a positive electrode interface is effectively relieved, and the electrochemical performance of an all-solid-state battery is improved.

The invention relates to a composite solid electrolyte membrane with high ceramic content and a preparation method and application thereof. The preparation method comprises the following steps: mixing ceramic solid electrolyte particles activated by a silane coupling agent with an in-situ polymerization solution containing a cross-linking agent, an organic monomer, a plasticizer, a lithium salt, an ultraviolet light initiator and a thermal initiator to form solid electrolyte slurry, wherein the ceramic solid electrolyte particles account for 60-90% of the total mass of the composite solid electrolyte membrane; the preparation method comprises the following steps: coating a positive pole piece with solid electrolyte slurry, initiating shallow organic matter monomers and a cross-linking agent to generate in-situ polymerization through an ultraviolet light initiator, covering a negative pole piece for hot pressing treatment, initiating residual organic matter monomers and the cross-linking agent to generate in-situ polymerization through a thermal initiator, and forming a composite electrolyte membrane with high ceramic content. The invention also discloses an all-solid-state battery containing the composite solid electrolyte membrane. The solid-state battery containing the in-situ formed composite solid-state electrolyte membrane has relatively high cycling stability.

The invention provides a wide-temperature-range chargeable and dischargeable semi-solid-state battery, a preparation method thereof and electric equipment, and relates to the technical field of new energy. According to the wide-temperature-range chargeable and dischargeable semi-solid-state battery provided by the invention, the solid-state electrolyte is added into the positive electrode material, and the diaphragm is coated with the solid-state electrolyte layer, so that atomic-scale contact between the solid-state electrolyte and the surfaces of electrode material particles is fully realized, and the thermal stability of the battery is greatly improved; meanwhile, the problem of slow reaction kinetics at low temperature is solved by using the nano solid electrolyte blended positive electrode material, and the low-temperature cycle performance of the battery is improved; the nanometer solid electrolyte coating diaphragm can solve the problem of poor electrolyte capacity diving, the electrolyte injection coefficient is effectively reduced, meanwhile, low internal resistance is achieved, and the long cycle stability of the battery is further improved; and a coating layer can be formed on the surface of the material by using the coating type binder, so that the side reaction between the electrode material and an electrolyte is effectively reduced, and the dissolution of transition metal Fe ions is remarkably inhibited.

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 invention provides a solid electrolyte slurry, an electrode slurry, a solid electrolyte sheet, an electrode sheet, a solid battery monomer, a battery device and a power utilization device.The solid electrolyte slurry comprises a sulfide solid electrolyte material, a solvent and a binder dissolved in the solvent, and the solvent is a non-polar solvent, a weak-polar solvent or a mixed solvent of the non-polar solvent and the weak-polar solvent; the binding agent comprises a polyacrylate binding agent and a non-polar polyolefin binding agent. The slurry disclosed by the invention has high dispersity, high suspension property and good cohesiveness, and can enable the solid-state battery monomer to have high initial coulombic efficiency when being used in the solid-state battery monomer.

The invention provides a positive pole piece, a preparation method thereof and a sulfide all-solid-state battery. The positive pole piece comprises a positive current collector and a positive material layer arranged on the surface of the positive current collector, the positive electrode material layer comprises a modified positive electrode active material, an antioxidant, a sulfide electrolyte material, a conductive agent and a positive electrode binder, the modified positive electrode active material comprises an inner core and an oxide coating layer arranged on the surface of the inner core, and the inner core is a lithium-containing positive electrode active material. When the positive electrode plate containing the antioxidant and the modified positive electrode active material provided by the invention is applied to the sulfide all-solid-state battery, the synergistic effect of the antioxidant and the modified positive electrode active material can be exerted, so that the rate capability and the cycling stability of the sulfide all-solid-state 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 belongs to the technical field of batteries, and discloses a pole piece and a preparation method thereof, a diaphragm-free battery and a solid-state battery. The pole piece comprises a current collector and an active substance layer, the active substance layer is arranged on at least one side of the current collector, the active substance layer comprises a mixed ion electron conductor material and an active substance, the mixed ion electron conductor material comprises an aggregate formed by reaction of a monomer, an initiator, a solid electrolyte and a conductive agent, a polymer formed by the monomer has cohesiveness and ion conductivity. According to the pole piece provided by the invention, the cycle performance, the safety performance and the rate capability of the battery can be improved.

The invention provides a solid-state battery performance testing method and system, and relates to the technical field of battery performance testing. According to the method, pressure is applied to the solid-state battery, the pressure value is gradually changed, in-situ CT imaging detection and electrochemical performance detection are carried out on the solid-state battery in the pressure change process, and coupling analysis is carried out on the pressure value, CT image information and electrochemical parameters; the mutual relation and evolution rule among the pressure value, the CT image information and the electrochemical parameters are summarized, so that the comprehensive performance characterization of the battery under different pressure conditions is realized, and more comprehensive and accurate data support is provided for deeply understanding the performance evolution of the battery in the actual use process; the internal relation between the internal structure change of the battery and the electrochemical performance can be disclosed, and an important theoretical basis and a guidance direction are provided for the optimization design of a battery material and the improvement of the battery performance.

The invention relates to the technical field of solid-state battery energy conversion, and discloses a high-safety sodium-ion battery energy conversion method based on a solid-state electrolyte, which comprises the following steps: identifying an interface dynamic mismatch risk time period in a charging and discharging process, and applying micro-amplitude high-frequency acoustic vibration disturbance to a solid-state electrolyte and a sodium negative electrode interface in the time period, sodium ion microscopic distribution is regulated and controlled through the acoustic streaming effect, contact stress is dredged, dendritic crystal early nucleation is inhibited, dynamic reconstruction and optimization of the interface state are achieved, the solid-state sodium-electricity interface is converted into dynamic self-adaption from static mismatch, the ion transmission uniformity is actively maintained through the acoustic streaming effect, and dynamic reconstruction and optimization of the interface state are achieved. And meanwhile, real-time sensing of an interface state and dynamic adjustment of acoustic vibration parameters are realized in combination with an acoustic probing mechanism, so that the interface stability and dendritic crystal inhibition capability are effectively improved, and the energy conversion efficiency and the safety performance of the battery are remarkably enhanced.

The invention provides a biomass solid electrolyte film and a preparation method thereof, a diaphragm-free solid-state battery, a solid-state battery and a mechanical device. The method comprises the following steps: (1) mixing biomass sugar, alkaline lithium salt and a first solvent to obtain lithiated biomass sugar which comprises at least one of chitosan, alginic acid and cellulose; (2) mixing the lithiated biomass sugar, a polymer solid electrolyte monomer, an inorganic material, an active lithium salt, an initiator and a second solvent, and polymerizing to obtain a precursor solution; and (3) applying the precursor solution to a base material, and drying to obtain the biomass solid electrolyte film. Therefore, the solid electrolyte film prepared by the method has excellent mechanical strength and toughness and strong machinability, and a solid-state battery prepared by adopting the biomass solid electrolyte film has high ionic conductivity and can replace a diaphragm, prepare a diaphragm-free battery, prolong the cycle life of the battery and improve the safety of the battery.

The invention provides a solid electrolyte film and a preparation method thereof, a diaphragm-free solid-state battery, a solid-state battery and a mechanical device. The method comprises the following steps: (1) mixing and modifying a lithium salt, an ionic liquid and a cross-linking agent to obtain a modified active component; (2) mixing the modified active component, a polymer monomer and an initiator to obtain a precursor solution, wherein the polymer monomer comprises at least one of a boron-containing monomer, a sulfate monomer, a carbonate monomer, an amide monomer, an ether monomer and a fluorine-containing monomer; and (3) applying the precursor solution to a base material for polymerization to obtain the solid electrolyte film. Therefore, the solid-state electrolyte film has high lithium ion conductivity and excellent mechanical strength and stability, a solid-state battery prepared from the solid-state electrolyte film has high ionic conductivity, a diaphragm can be replaced, a diaphragm-free battery can be prepared, the cycle life of the battery is prolonged, and the safety of the battery is improved.

A method of manufacturing a battery cathode for a solid state battery is provided. The method includes generating a plasma remote from one or more targets suitable for forming cathodes, such as LiCoO2, exposing the plasma target or targets to the plasma, thereby generating sputtered material from the target or targets, and depositing sputtered material on a first portion of a substrate, thereby forming crystalline material, such as LiCoO2 on the first portion of the substrate.

The invention discloses a negative electrode interface modification material, a negative electrode plate, a positive electrode interface functional layer, a positive electrode plate, a solid-state battery and a power utilization device, and relates to the technical field of batteries, the negative electrode interface modification material comprises a first polymer matrix, a reinforcing filler, a conductive agent and a lithium salt, the modulus of the reinforcing filler is greater than 50 GPa. The tensile strength of the negative electrode interface modification material can be improved through the first polymer matrix, breakage of a negative electrode interface modification layer is reduced, interface impedance is reduced, meanwhile, the first polymer matrix can be matched with the expansion coefficient of a silicon-based material, and bulging of a negative electrode plate is reduced. The modulus of the reinforcing filler is greater than 50GPa, so that the modulus of the negative electrode interface modification layer can be improved, the expansion of the silicon-based active material is further inhibited, the conductive agent can relieve the problem that the flexible substrate interface of the copper foil and the negative electrode interface modification layer possibly causes unsmooth electron transmission, and the lithium salt can improve the ion conduction capability and reduce the interface impedance.

The invention discloses a high-interface-stability composite solid electrolyte membrane as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a gradient aperture three-dimensional porous skeleton formed by sintering inorganic solid electrolyte particles, a polymer electrolyte filled in a pore channel, and a plastic interface stable layer positioned between the electrolyte membrane and an electrode. The preparation method comprises the following steps: preparing a gradient aperture porous framework through a pore-forming agent template method and a tape casting technology, dipping and filling a polymer electrolyte precursor solution in a solution, accelerating in-situ polymerization by adopting electric induction, and performing hot-pressing treatment. The composite solid-state electrolyte membrane has high ionic conductivity, excellent interface compatibility and high mechanical strength, can effectively inhibit the growth of lithium dendrites, can be applied to solid-state batteries such as lithium metal batteries, lithium sulfur batteries and lithium air batteries, and can remarkably prolong the cycle life and improve the safety performance of the batteries, and the preparation process is suitable for large-scale production.

The invention relates to the technical field of solid-state battery forming, in particular to a cold isostatic pressing machine for a solid-state battery and a forming method.The cold isostatic pressing machine for the solid-state battery comprises a base and a rack arranged on the base and is characterized by further comprising an adjustable supporting device arranged on the base and a pressure device arranged on the adjustable supporting device; the adjustable supporting device comprises a supporting seat, an overturning support rotationally connected to the supporting seat and a driving assembly. The pressure device comprises a pressure tank main body arranged on the overturning support; the rack is provided with a sealing device, the sealing device comprises a sealing ring, the sealing ring is provided with a wave-shaped outer wall, the sealing ring faces the opening of the pressure tank body, and the wave-shaped outer wall abuts against or is separated from the pressure tank body. The overturning support can be rotated by utilizing the adjustable supporting device, so that the interior of the tank body can be conveniently operated; and meanwhile, the sealing device is provided with a waveform outer wall, so that the sealing performance of the pressure tank main body is ensured, and the pressing efficiency can be effectively improved.

The present invention relates to a coating method for a high-nickel layered oxide positive electrode material, comprising the following steps: dissolving the high-nickel layered oxide positive electrode material, a high-valent metal halide, and an alkaline lithium source in a solvent, mixing them evenly, centrifuging, and filtering, and then calcining the obtained mixed powder to obtain a high-nickel layered oxide positive electrode material with a coated structure. The present invention utilizes an acid-base neutralization reaction to coat the high-nickel layered oxide positive electrode material, and the coated components include three elements: a high-valent metal, a halogen element (F or Cl) with a high electronegativity, and a Li element. The purpose of coating the former two is to improve the structural stability of the high-nickel layered oxide, and the latter provides a lithium source for the positive electrode material, while avoiding contact between the high-nickel layered oxide and the sulfide electrolyte, inhibiting the occurrence of side reactions, and being beneficial to the long-cycle stability of the sulfide all-solid-state lithium battery.

The invention belongs to the technical field of solid-state batteries, and provides a lithium-sulfur-phosphorus-chlorine-bromine solid-state electrolyte, a preparation method thereof and an all-solid-state battery. The preparation method comprises the following steps: mixing lithium sulfide and phosphorus sulfide, and carrying out ball milling to obtain a lithium-sulfur-phosphorus ternary mixture; in protective gas, the lithium-sulfur-phosphorus ternary mixture, lithium chloride and lithium bromide are mixed and then subjected to ball milling, and a lithium-sulfur-phosphorus-chlorine-bromine mixture is obtained; and carrying out heat treatment on the lithium-sulfur-phosphorus-chlorine-bromine mixture in protective gas to obtain the lithium-sulfur-phosphorus-chlorine-bromine solid electrolyte. The lithium-sulfur-phosphorus-chlorine-bromine solid electrolyte provided by the invention not only improves the electrochemical stability, but also maintains the high ionic conductivity characteristic.

To provide an in-situ electrochemical passivation and repair method for a solid-state lithium battery.SOLUTION: A sulfide-based solid-state battery is discharged to a specific lithiation degree according to a specific discharge mode under low current density, so that in-situ electrochemical passivation and / or repair of the battery are / is realized. Through the electrochemical reduction method, the interface of the sulfide-based solid-state battery can be passivated and stabilized, and the sulfide electrolyte is prevented from being continuously decomposed in the charging and discharging process, so that the sulfide solid-state electrolyte can be matched with an oxide positive electrode material with relatively high operating voltage; and an oxidation product generated by decomposition in the cycle process is converted into a lithium-rich reduction product with ion conductivity again, so that the activation and repair effects are achieved, and the battery has more excellent cycle stability.SELECTED DRAWING: Figure 13

The invention belongs to the technical field of new energy materials and devices, and relates to a gel electrolyte, a preparation method and a solid-state lithium battery, a liquid novel initiator with a low freezing point, a cyclic ether polymeric monomer and a plasticizer are mixed to form a homogeneous precursor solution, the precursor solution is injected into a battery shell, standing is performed at normal temperature (20-35 DEG C) for in-situ polymerization, and the solid-state lithium battery is obtained. And the gel electrolyte-based solid-state battery can be obtained. The gel electrolyte is initiated by a novel initiator, and compared with a common initiator, the gel electrolyte has better low-temperature performance, and a high-performance solid-state lithium battery is formed.

The invention belongs to the field of lithium ion battery materials, and discloses a chloride coated modified positive electrode material, which comprises a positive electrode material matrix and a chloride LiaMClb coated on the surface of the positive electrode material matrix, M is selected from at least one of Ti, Cr, Mn, Fe, Co and Cu, 1 < = a < = 4, 2 < = b < = 6. According to the preparation method, the chloride LiaMClb is deposited on the surface of the positive electrode material substrate in an atomic layer deposition mode. The invention also discloses a sulfide all-solid-state lithium ion battery which comprises the chloride coated modified positive electrode material. The LiaMClb is selected to coat the modified positive electrode material, the LiaMClb and the positive electrode material show good interface compatibility, and the good oxidation resistance of chloride ions can effectively inhibit the decomposition side reaction of the chloride ions and the positive electrode material in the lithium removal process.