815results about "Lithium compounds" patented technology

A sulfide solid electrolyte, which is able to adjust the morphology unavailable traditionally, or is readily adjusted so as to have a desired morphology, the sulfide solid electrolyte having a volume-based average particle diameter measured by laser diffraction particle size distribution measurement of 3 μm or more and a specific surface area measured by the BET method of 20 m2 / g or more; and a method of treating a sulfide solid electrolyte including the sulfide solid electrolyte being subjected to at least one mechanical treatment selected from disintegration and granulation.

The invention discloses a high-selectivity magnesium-lithium separation nanofiltration membrane based on a polyolefin base membrane and a preparation method and application of the high-selectivity magnesium-lithium separation nanofiltration membrane based on the polyolefin base membrane. The preparation method comprises the steps that the polyolefin base membrane is in single-face contact with an organic phase monomer solution containing an isophthaloyl chloride monomer or a paraphthaloyl chloride monomer, and the redundant solution is poured out; one side, contacted with the organic phase monomer solution, of the obtained membrane is contacted with a polyethyleneimine-containing aqueous phase monomer solution, an interfacial polymerization reaction is carried out, the obtained membrane is placed in a drying oven for heat treatment, then the membrane is soaked in an organic solution for activation, and the polyvinyl composite nanofiltration membrane is obtained. The nanofiltration membrane has high magnesium ion interception and high magnesium-lithium separation selectivity in a mixed solution with a high magnesium-lithium ratio, the preparation process is simple, conditions are mild, amplification and industrial production are easy to realize, and the nanofiltration membrane has good long-term operation stability.

The invention discloses high-purity lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the step that lithium hydride, lithium hydroxide and a sulfur source are subjected to a heating reaction in a dry inert atmosphere, and the high-purity lithium sulfide is obtained. The molar ratio of lithium hydride to lithium hydroxide is X: (10-X), and X is 1-6. The invention also discloses the prepared high-purity lithium sulfide and application of the high-purity lithium sulfide in preparation of sulfide solid electrolyte. Lithium hydroxide and lithium hydride are mixed to serve as a lithium source in lithium sulfide preparation, the lithium hydroxide quickly and uniformly reaches the reaction temperature by means of the characteristic that the lithium hydride reacts with a sulfur source to release heat and produce gas, the lithium hydride reacts to produce gas, meanwhile, discharging of product water vapor is facilitated, and oxygen in the environment is isolated; and hardening and generation of a side reaction product lithium sulfate are prevented, the conversion rate of lithium hydroxide to lithium sulfide is improved, and the raw material and process cost for preparing lithium sulfide is remarkably reduced.

The invention relates to the field of recycling of solid waste resources. The invention particularly relates to a method for synergistically recovering failed lithium iron phosphate black powder and a failed platinum-containing catalyst. The invention discloses a method for synergistically recovering failed lithium iron phosphate black powder and a failed platinum-containing catalyst. The method comprises the following steps: A, vacuum reduction smelting; b, oxidizing and dissolving; c, carbon thermal reduction; and D, ammonium salt precipitation and calcination. The method for recovering the platinum group metal does not need to add a trapping agent, has the advantages of being high in resource utilization rate, good in economic benefit and short in process, and effectively reduces the influence of solid waste resources on the environment.

The present invention relates to the technical field of lithium battery materials, and specifically provides a method for preparing lithium sulfide and application thereof, wherein hydrogen sulfide with water content and oxygen content limited within a certain range is used as a sulfur source to react with a lithium source to prepare lithium sulfide, thereby greatly reducing the generation of lithium hydroxide or oxidative impurities, thereby facilitating the improvement of the purity of the lithium sulfide product, and can be directly used as a raw material for a sulfide solid electrolyte, thereby facilitating the improvement of the performance of the sulfide solid electrolyte.

The invention discloses a lithium supplement additive and a preparation method and application thereof. The lithium supplement additive comprises a lithium sulfinate compound, and the lithium sulfinate compound contains an electron withdrawing group. An electron withdrawing group contained in the lithium sulfinate compound in the lithium supplement additive can effectively change electron cloud distribution around sulfur atoms, so that the lithium sulfinate compound is endowed with relatively high lithium supplement capacity; meanwhile, due to the existence of the electron withdrawing group, the electron energy of the lowest unoccupied molecular orbital (LUMO) of the lithium sulfinate compound is reduced, and the energy gap between the highest occupied molecular orbital (HOMO) and the LUMO of the lithium sulfinate compound is reduced, so that the lithium supplement additive can be arranged in an electrode plate to exert the lithium supplement capacity and also can be used as an electrolyte additive; and the material can participate in electrode / electrolyte interface formation.

The invention discloses a preparation method of hydrogen fluoride, hydrogen fluoride and a battery material. The preparation method comprises the following steps: reacting a fluosilicic acid solution with a sulfuric acid solution to obtain mixed gas and fluorine-containing sulfuric acid; the content of hydrogen fluoride in the mixed gas is 10%-20%, and the content of hydrogen fluoride in the fluorine-containing sulfuric acid is 90%-80%; treating the mixed gas with concentrated sulfuric acid to obtain absorbed sulfuric acid; performing falling film evaporation treatment on fluorine-containing sulfuric acid to obtain a hydrogen fluoride-containing gas phase; and absorbing sulfuric acid to wash the hydrogen fluoride-containing gas phase to obtain hydrogen fluoride gas. The preparation method of hydrogen fluoride provided by the invention is beneficial to improving the recovery rate of hydrogen fluoride.

The invention discloses a preparation method of a crown ether functionalized anti-pollution nanofiltration membrane, which comprises the following steps: soaking a membrane of a commercial nanofiltration membrane in pure water, and coating the surface with a double-end epoxy compound ethanol solution; uniformly coating the surface of the membrane with an aza 12-crown-4 methanol solution; and drying the membrane in an atmosphere of 40-90 DEG C to obtain the crown ether functionalized anti-pollution nanofiltration membrane. The nano-filtration membrane is realized by chemically grafting aza 12-crown-4 on the membrane surface of a commercial nano-filtration membrane by utilizing a double-end epoxy compound; compared with a traditional nanofiltration membrane, the crown ether functionalized nanofiltration membrane provided by the invention has the advantages that the electronegativity of the surface is reduced, and the surface is similar to an aquatic plant molecular brush structure, so that the deposition of pollutants on the surface of the membrane can be effectively improved, and the anti-pollution performance of the membrane is enhanced; meanwhile, due to the complexing effect of 12-crown-4 molecules on lithium ions, the lithium ions can be effectively captured, concentration polarization of the lithium ions on the surface of the diaphragm is improved, and then the magnesium-lithium separation efficiency of the diaphragm is improved.

To provide an efficient method of preparing high-purity lithium sulfide.SOLUTION: In a method for preparing lithium sulfide, a solid sulfur layer and a lithium source layer are sequentially arranged in a reactor. A gas feed is injected into the reactor in a single direction to obtain a lithium sulfide-containing product. The lithium sulfide-containing product is dissolved in an anhydrous solvent to form a lithium sulfide-containing solution. Lithium sulfide is separated from the lithium sulfide-containing solution. The gas feed sequentially passes through the solid sulfur layer and the lithium source layer, such that high-purity lithium sulfide may be efficiently prepared.SELECTED DRAWING: Figure 1

The invention discloses hydrogen fluoride, a preparation method thereof and a battery material. The preparation method of hydrogen fluoride comprises the steps that fluosilicic acid and first sulfuric acid react to generate mixed gas and first mixed sulfuric acid, the first mixed sulfuric acid is a sulfuric acid solution containing hydrogen fluoride, and the mixed gas comprises silicon tetrafluoride gas and hydrogen fluoride gas; washing the mixed gas with second sulfuric acid to obtain second mixed sulfuric acid and washed silicon tetrafluoride gas; the second mixed sulfuric acid is obtained by absorbing the hydrogen fluoride gas by second sulfuric acid; washing the water-containing hydrogen fluoride with second mixed sulfuric acid to obtain crude hydrogen fluoride gas; and purifying the crude hydrogen fluoride gas to obtain anhydrous hydrogen fluoride. According to the preparation method of the hydrogen fluoride, through washing treatment of the second sulfuric acid and washing treatment of the second mixed sulfuric acid, the recovery rate of the hydrogen fluoride is remarkably increased.

The invention relates to a sulfide solid electrolyte and a preparation method and application thereof, and the preparation method comprises the following steps: distributing elemental sulfur powder on the surface of lithium sulfide powder to obtain composite powder; mixing the composite powder with phosphorus sulfide and lithium halide to obtain a precursor; and sintering the precursor to obtain the sulfide solid electrolyte. According to the preparation method disclosed by the invention, the elemental sulfur powder is distributed on the surface of the lithium sulfide powder, so that the elemental sulfur powder can participate in formation of the sulfide solid electrolyte before volatilization in the sintering process, the prepared sulfide solid electrolyte does not have sulfur loss, and no impurity phase is generated in the sulfide solid electrolyte; therefore, the ionic conductivity of the sulfide solid-state electrolyte can be improved, and the electrochemical performance of an all-solid-state battery can be obviously improved when the sulfide solid-state electrolyte is used for assembling the all-solid-state battery; meanwhile, the preparation method is simple and efficient, and the obtained sulfide solid electrolyte is uniform in performance.

The present invention relates to a process for preparing lithium bis(fluorosulfonyl)imide, comprising the following steps of: contacting of bis(fluorosulfonyl)imide with a lithium base in a solvent selected from carbonates, ethers and nitriles, to obtain a mixture comprising lithium bis(fluorosulfonyl)imide and water; diafiltration of the mixture on a nanofiltration membrane so as to obtain, firstly, a concentrate enriched in lithium bis(fluorosulfonyl)imide and depleted in water and, secondly, a permeate depleted in lithium bis(fluorosulfonyl)imide and enriched in water. The present invention also relates to a process for preparing an Li-ion battery electrolyte.

The invention relates to the technical field of battery raw materials, in particular to a preparation method of lithium sulfide powder, the lithium sulfide powder and application, and the preparation method comprises the following steps: uniformly mixing lithium sulfate and a carbon source according to a preset proportion to obtain a first mixture; performing first heat treatment on the first mixture in inert gas to obtain a second mixture; and performing second heat treatment on the second mixture in reducing gas to obtain the lithium sulfide powder. The product obtained by the preparation method disclosed by the invention is the lithium sulfide powder, and the obtained lithium sulfide powder has the advantages of less oxygen and carbon impurities, higher purity and high reaction activity, and meets the synthesis requirements of the electrolyte; according to the preparation method, in the process of preparing lithium sulfide, toxic gas and organic solvent are not used, the reaction temperature is low, the energy consumption is low, the requirement on production equipment is low, the process is simple, the cost is low, harmful gas emission is avoided, safety and environment friendliness are achieved, and industrialization is easy to achieve.

The invention discloses a high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid electrolyte, a preparation method thereof, a battery and application. The chemical formula of the sulfide solid electrolyte is Li7-aPS6-aXa, X is halogen, and a is greater than or equal to 1 and less than or equal to 2; wherein the peak area of a diffraction peak corresponding to a (111) crystal plane of the sulfide solid electrolyte is I1, the peak area of a diffraction peak corresponding to a (311) crystal plane of the sulfide solid electrolyte is I2, and I1 / I2 is larger than or equal to 0.2 and smaller than or equal to 0.3. The I1 / I2 of the sulfide solid electrolyte disclosed by the invention is within the range, a good crystal structure and a relatively large interface area can be provided, and ion movement is promoted, so that relatively high ionic conductivity is obtained. Furthermore, according to the method disclosed by the invention, the high ionic conductivity of the product is ensured by reducing the solvent dosage and optimizing the sintering step, and meanwhile, the environmental pollution, the energy consumption and the production cost are remarkably reduced.

The present invention relates to a sulfide solid electrolyte powder that has a crystal phase, wherein a value that is expressed by [(strain value -0.001) / specific surface area (m2 / g)] × 100 is 0.010–0.070, and the crystal phase has an argyrodite crystal structure.

The invention provides a sulfide solid electrolyte and a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, carrying out dry ball milling treatment on raw materials Li2S, P2S5 and LiX according to a required stoichiometric ratio, so that the raw materials are amorphized; s2, adding a solvent into the non-crystallized raw material obtained in the step S1, and carrying out wet ball-milling treatment to obtain a precursor with the particle size of 0.05-0.5 mu m; s3, the solvent is removed from the precursor slurry, the sulfide solid electrolyte is obtained through solid-phase sintering, all the steps are carried out in an inert atmosphere, and X is a halogen element. According to the present invention, the non-crystallization of the raw material is achieved through the dry ball milling, the uniform precursor slurry with the small particle size is obtained by combining the wet ball milling, and the sub-micron / nano-scale pure phase electrolyte material can be obtained after the sintering treatment, such that the electrode / electrolyte interface contact is improved, the impedance is reduced, and the battery performance is significantly improved.

The invention discloses a hydrogel-based water-energy-resource co-production solar evaporator and application thereof, and belongs to the technical field of chemistry and environment, the hydrogel-based water-energy-resource co-production solar evaporator is prepared by taking sodium alginate hydrogel as a matrix, adding carbon nanotubes and a titanium-based lithium ion sieve or a metal-doped titanium-based lithium ion sieve into a solution of the sodium alginate hydrogel, taking polyurethane sponge as a carrier frame, and preparing the hydrogel-based water-energy-resource co-production solar evaporator. Ca2 + is adopted as a cross-linking agent to construct a solar evaporator with a flexible size (centimeter-level to meter-level components can be prepared according to application scenes), the solar evaporator is used for the solar driven evaporation process of lithium-containing water resources such as salt lake seawater, and Li + selective enrichment, fresh water collection and waste heat power generation are synchronously achieved. Moreover, the evaporator has the characteristics of simple preparation process, low cost and excellent environmental compatibility, also has a good removal effect on salt ions, and keeps stable fresh water collection performance in a long-time operation process.

The present invention discloses a lithium-rich manganese-based positive electrode material and a preparation method thereof, and a lithium-ion battery. The method comprises: mixing and dissolving a manganese source, a cobalt source and a lithium source to obtain a metal salt solution; adding an organic phosphorus sulfide, a complexing agent and a dispersant to react to obtain a precursor solution; adding a lithium hydroxide solution, and aging after a precipitation reaction; heat-treating, washing and drying the precipitate after aging; mixing the dried precipitate with a lithium source, and sintering in sections to obtain a lithium-rich manganese-based positive electrode material. The lithium-rich manganese-based positive electrode material and a preparation method thereof, and a lithium-ion battery provided by the present invention can adjust the migration of cobalt and lithium ions under different electrochemical states by forming a nano-scale dynamic interface inside the material by cobalt and lithium, and avoid the passivation phenomenon after doping in the prior art; and introducing phosphorus-sulfur groups into the material system can effectively stabilize the lattice structure of the material and improve the conductivity of the material by improving the efficiency of electron and ion transmission.

The invention belongs to the technical field of lithium adsorbents, and particularly relates to lithium ion sieve hydrogel with double properties and a preparation method and application thereof. According to the prepared lithium ion sieve hydrogel, ions (Al, Fe and the like) with the same valence state and different sizes are used for replacing part of manganese ions, so that the crystal structure of an ion sieve is more stable, an ion channel is wider, and therefore, the lithium ion sieve hydrogel has relatively high lithium ion adsorption capacity and stability; the high adsorption capacity and mechanical strength can still be kept in multiple cyclic adsorption-desorption cycles, the lithium ion adsorption capacity cannot be lost due to dissolution loss of the lithium ion sieve, and the lithium ion sieve has an integral structure while having a large surface area by means of device formation of the hydrogel. Therefore, the method has excellent recovery capability and long service life, can keep the morphology of the device from being damaged in a complex use environment, is convenient to use and recover, and has important theoretical significance and application value.

The invention belongs to the technical field of electrolyte, and particularly relates to a method for preparing liquid lithium hexafluorophosphate from sodium hexafluorophosphate. The method comprises the following steps: adding a sodium source into a hexafluorophosphoric acid aqueous solution for neutralization reaction to obtain a sodium hexafluorophosphate aqueous solution, then extracting to remove water, drying to obtain a sodium hexafluorophosphate solid, and heating and decomposing the sodium hexafluorophosphate solid to obtain phosphorus pentafluoride gas; the phosphorus pentafluoride gas is not mixed with SO3, POF3, HF and other impurity gases, a complex refining and purifying process is not needed, and the phosphorus pentafluoride gas with the purity exceeding 99.9% can be obtained after simple purification and can be directly used for synthesizing liquid lithium hexafluorophosphate. The method does not generate waste acid, does not need a complicated phosphorus pentafluoride gas purification process, is particularly suitable for the requirements of the lithium battery industry on high-purity electrolyte, and has the remarkable advantages of high product purity, small environmental pollution, low production cost and the like.

The invention discloses a fast-charging low-temperature graphite composite material, a preparation method and application thereof, the composite material is of a core-shell structure, the core is porous graphite and a carbon nanotube doped with the porous graphite, and the shell is composed of a lithium supplement agent and a lithium sulfonate complex of the lithium supplement agent. The preparation method comprises the following steps: soaking porous graphite in a conductive polymer solution, adding a catalyst, a cross-linking agent and an oxidizing agent, carrying out oxidative polymerization and carbonization to obtain catalyst-doped porous graphite, and introducing carbon source gas through a vapor deposition method to obtain carbon nanotube-doped porous graphite; and adding the obtained material into a lithium sulfonate solution, adding a lithium supplement agent, uniformly mixing, and carrying out spray drying to obtain the graphite composite material. According to the obtained material, the electronic conductivity of the material is improved by using the carbon nanotubes grown on the inner core, and the lithium sulfonate coated on the outer shell has relatively strong solvation capability, so that the transmission rate of lithium ions is improved, and the rate capability is improved; meanwhile, the lithium supplement agent releases lithium ions in the charging and discharging process, the first efficiency is improved, and the low-temperature and fast-charging performance is improved.

A cathode active material, a cathode including the cathode active material, an all-solid secondary battery including the cathode, and a method of preparing the cathode active material are provided. The cathode active material includes primary particles including a Li2S-containing composite, secondary particles including the primary particles agglomerated therein, wherein a D10 size of the secondary particles is 5 µm or more.

The present invention relates to a method for co - processing and resource utilization of overhaul slag, fly ash, and desulfurized gypsum. The method comprises the following steps: Step 1) dehydrate and then dry the desulfurized gypsum, add calcium carbonate to the dried desulfurized gypsum, and collect SO3 gas; Step 2) carry out an autoclave reaction on the SO3 gas obtained in Step 1, water, and fly ash. After solid - liquid separation, silicon dioxide and an aluminum sulfate solution are obtained; Step 3) crush and ball - mill the overhaul slag, and carry out first - stage roasting with a peroxide at high temperature to obtain clinker 1; leach out sodium fluoride from clinker 1 by water immersion, and then add it to the aluminum sulfate for second - stage roasting to obtain clinker 2; Step 4) mix clinker 2 with water for leaching to obtain a filtrate and a filter residue; Step 5) calcine calcium oxide and the filter residue to obtain calcium aluminate. The beneficial effect of the present invention aims to synergistically utilize the sodium, aluminum, fluorine, and lithium elements, the aluminum and silicon elements of fly ash, and the calcium element in desulfurized gypsum to achieve the purpose of resource conversion.

The invention discloses a preparation method of a rapid adsorption conductive lithium ion sieve membrane, and relates to the field of preparation of lithium ion sieve membranes. The invention aims to solve the problems that the traditional lithium ion sieve is too slow in adsorption rate, easy to dissolve and damage in the regeneration process and incapable of meeting industrial requirements. According to the invention, SP-PDA-coated PVDF is used as a base membrane to prepare a PTH-coated HMO conductive polymer, and the PTH-coated HMO conductive polymer is applied to an ESIX process to develop a conductive lithium ion sieve membrane which is good in conductivity, low in manganese dissolution loss and capable of rapidly adsorbing. The method comprises the following steps: 1, preparing an SP-PDA coated PVDF membrane; 2, preparing a PTH-HMO conductive polymer; and 3, preparing the PTH-HMO-SP-PDA-PVDF conductive polymer. The prepared rapid adsorption conductive lithium ion sieve membrane has longer service life, and the replacement frequency and the maintenance cost are reduced. According to the invention, the rapid adsorption conductive lithium ion sieve membrane can be obtained.

The invention discloses a lithium adsorbent particle and a preparation method and application thereof, and the lithium adsorbent particle internally contains lithium adsorbent precursor powder, polypeptide, a polymer binder and a pore-foaming agent. The precursor powder, the polymer binder and the pore-foaming agent are crosslinked into a network structure through chain entanglement and hydrogen bond interaction between the polypeptide and the polymer binder and the pore-foaming agent and a self-crosslinking effect. The invention aims to solve the problems of large use amount of a binder, low proportion of an effective component lithium adsorbent precursor, low surface hydrophilicity of adsorbent particles, low adsorption capacity after granulation, low lithium extraction efficiency and the like in the existing molding granulation technology.

The utility model discloses a salt lake lithium extraction adsorbent scrubbing system which comprises a scrubbing tower and an adsorption tower, and a sunken water distributor is arranged at the bottom end in the scrubbing tower; the middle position of the bottom of the concave water distributor penetrates through the bottom of the scrubbing tower and is connected with a runner opening; a water replenishing opening is formed in the middle of the bottom of the scrubbing tower; two feed ports are formed in the positions, close to the water inlet, of one side of the scrubbing tower, and a water outlet is formed in the position, close to the top, of one side of the scrubbing tower; the flow channel port is sequentially connected with a pneumatic valve j, a diaphragm pump B and an adsorption column through a pipeline; according to the system, crushed resin particles and impurities are effectively removed by cleaning an adsorbent, so that the adsorption performance and the flowability of a resin bed layer are recovered, and it is ensured that the resin bed layer is always in the optimal working state. In the process of scrubbing the adsorbent, the adsorbent does not need to be manually carried except for necessary adsorption tower pipeline connection operation, so that the scrubbing efficiency is remarkably improved.

A solid electrolyte according to one aspect of the present invention is a solid electrolyte containing lithium, phosphorus, sulfur, aluminum, nitrogen, bromine, and iodine as constituent elements and having a crystal structure, wherein the solid electrolyte satisfies conditions (a), (b), or (c) below when a molar ratio of the lithium to the phosphorus is represented by r1, a molar ratio of a sum of the bromine and the iodine to the phosphorus is represented by r2, and a molar ratio of a sum of the bromine and the iodine to the nitrogen is represented by r3. 3.00≤r1−r2≤3.60and1.5≤r3≤100 2.80≤r1−r2<3.00and2.0≤r3≤100 2.60≤r1−r2<2.80and2.5≤r3≤100

The invention relates to a lithium hexafluorophosphate solution and a preparation method thereof. The method comprises the following steps: introducing phosphorus pentafluoride into a lithium fluoride suspension dispersed in an organic solvent for reaction to generate a lithium hexafluorophosphate reaction solution; and after the reaction is finished, carrying out gas stripping by using inert gas, adding lithium carbonate powder to further react with residual hydrogen fluoride in the system after the gas stripping is finished, and after the reaction is finished, filtering and deacidifying to obtain a qualified product. The lithium hexafluorophosphate solution provided by the invention has high storage stability, and has no obvious acidity and color number increase after being stored at room temperature for 6 months.

The invention relates to the technical field of electrochemistry, and provides a sulfide solid electrolyte and an all-solid-state lithium battery, the chemical formula of the sulfide solid electrolyte is Li < 7-2x-y > PMxS < 6-x-y > OxCl < 0.7-y > Br < 0.3 y >, M is at least one of Ca, Mg and Cu, x is more than or equal to 0.01 and less than or equal to 0.3, y is more than or equal to 0.5 and less than or equal to 2, x / y is more than or equal to 0.008 and less than or equal to 0.24, the molar ratio of the element M to the element O is 1: 1, and the molar ratio of the element Cl to the element Br is 7: 3; the grain boundary impedance of the sulfide solid electrolyte at 25 DEG C is 20 Omega to 100 Omega. Through the arrangement, the sulfide solid electrolyte disclosed by the invention has relatively low grain boundary impedance while maintaining high ionic conductivity and good air stability. Furthermore, when the sulfide solid electrolyte is applied to the all-solid-state lithium battery, the electrochemical performance of the all-solid-state lithium battery can be improved.