146 results about "Solid-state lithium-ion battery" patented technology

The invention relates to the technical field of solid-state lithium ion batteries, in particular to a composite solid-state electrolyte diaphragm, a preparation method and an all-solid-state battery. According to the invention, a 3D ion / electron channel is constructed through a cellulose skeleton, an oxide electrolyte nanowire directional arrangement technology is adopted, and an in-situ interface lithium fluoride repairing layer is adopted, so that the industrialization bottleneck that high ion conduction-mechanical strength-interface stability is difficult to collaboratively optimize in the prior art is broken through; the common problems of insufficient bulk phase and interface ion conductivity, poor mechanical strength, poor compatibility with a high-nickel positive electrode / silicon carbon negative electrode and the like of a solid-state battery are effectively solved. The mass energy density of the prepared all-solid-state battery can reach 360 Wh / kg, the capacity retention ratio can still be maintained at 80% or above after 1100 times of circulation, and the all-solid-state battery successfully passes 190 DEG C thermal runaway and acupuncture tests and shows excellent safety performance and wide industrial application prospects.

The invention belongs to the technical field of solid-state batteries, and provides a lithium-ion solid-state electrolyte and a preparation method and application thereof. The lithium ion solid electrolyte comprises a polymer matrix, a lithium salt, a polar organic compound, a polymer monomer (comprising a first monomer and a second monomer) and an anion acceptor. The preparation method comprises the following steps: mixing a lithium salt and a polar organic compound to obtain a eutectic mixture; mixing a polymer matrix, a first monomer, a second monomer and an anion acceptor with the eutectic mixture to obtain a precursor solution; and coating a substrate with the precursor solution, curing and drying. The invention also discloses a solid-state lithium ion battery comprising the lithium-ion solid-state electrolyte and a manufacturing device of the solid-state lithium ion battery. The lithium ion solid electrolyte disclosed by the invention is high in room-temperature ionic conductivity, excellent in tensile strength, tensile elongation and high in breaking strength and incombustibility, and the lithium ion transference number is increased; therefore, the battery has long-term cycle stability, and the problem of electrode stress failure under low stacking pressure is solved.

The invention discloses a modified lithium-rich manganese-based positive electrode material, a preparation method thereof and application of the modified lithium-rich manganese-based positive electrode material in a solid-state lithium battery, and belongs to the field of lithium ion battery materials. The modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material and a coating layer LiAl thereof, the molecular formula of the lithium-rich manganese-based positive electrode material is xLi2MnO3. (1-x) LiMO2, M is one or more of transition metals Ni, Co and Mn, and x is more than 0 and less than 1; and the coating layer LiAl is formed by decomposing LiAlH4. The preparation method comprises the following steps: uniformly mixing a lithium-rich manganese-based positive electrode material xLi2MnO3. (1-x) LiMO2 and LiAlH4 through a solid phase method or a liquid phase method, and then annealing in an inert atmosphere to prepare the modified lithium-rich manganese-based positive electrode material. The problems of unstable interface and poor transmission kinetics in the sulfide-based all-solid-state lithium ion battery are solved at the same time, and the first-circle charge-discharge specific capacity and cycle stability of the solid-state lithium ion battery can be improved.

The invention provides a single-crystal cobalt-free lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a cobalt-free lithium-rich manganese-based precursor material, a lithium source and a grain boundary separation auxiliary agent to obtain a mixed material; the mixed material is subjected to two-stage sintering, the two-stage sintering comprises first sintering and second sintering in sequence, and the single-crystal cobalt-free lithium-rich manganese-based positive electrode material is obtained, wherein primary crystal grains of the cobalt-free lithium-rich manganese-based precursor material are of a sheet structure. According to the invention, the cobalt-free lithium-rich manganese-based precursor material of which the primary crystal grains are of a sheet structure is taken as a raw material, and under the action of the grain boundary separation auxiliary agent, a two-stage sintering process is cooperatively matched, so that the single-crystal cobalt-free lithium-rich manganese-based positive electrode material which is uniform in grain size, high in dispersity, complete in crystal grains and continuous in interface is obtained, and the cobalt-free lithium-rich manganese-based positive electrode material is not only suitable for a liquid lithium ion battery, but also suitable for a lithium ion battery. The material is more suitable for a solid-state lithium ion battery, and the electrochemical performance of the battery is effectively improved.

The invention discloses application of a 2, 4-thiazolidinedione compound in a solid-state lithium ion battery electrolyte, the solid-state lithium ion battery electrolyte and a preparation method of the solid-state lithium ion battery electrolyte. The 2, 4-thiazolidinedione compound disclosed by the invention is used for preparing a solid-state lithium ion battery electrolyte, and the structure of the 2, 4-thiazolidinedione compound is as follows: # imgabs0 #, in which R1 to R7 are independently a sulfonic group, a cyano group, an ionic liquid group, a borate group, a polyether chain segment, an amino group and an ether group. The 2, 4-thiazolidinedione compound is used as a functional additive of an electrode material, the structural stability is improved through chemical bonding or physical coating, volume expansion is relieved, or an electron / ion conduction network is enhanced; a functional interface layer is formed on the surface of the electrode, so that side reaction (such as electrolyte decomposition) is inhibited, interface impedance is reduced, and the lithium metal negative electrode is stabilized (such as dendrite growth is inhibited); through an electrochemical decomposition or pre-passivation strategy, a stable solid electrolyte interface (SEI) is constructed, and the cycle life is prolonged.

The invention provides a solid-state battery electrolyte material, a preparation method thereof and a solid-state lithium ion battery. The preparation method comprises the following steps: S1, carrying out first reaction on a first raw material comprising an organic ligand, zircon salt, a first acid solution and a first organic solvent to obtain a metal organic framework material; and step S2, carrying out a second reaction on a second raw material comprising dimethyl 2, 6-dipicolinate and a metal organic framework material to obtain the solid-state battery electrolyte material. The solid-state battery electrolyte material obtained by adopting the preparation method disclosed by the invention has good mechanical properties, a wider electrochemical window and higher ionic conductivity, so that the initial efficiency, the capacity and the cycle performance of the battery are improved, and the internal resistance of the battery is reduced at the same time.

The invention provides a modified solid electrolyte, a preparation method thereof and an all-solid-state lithium ion battery, and belongs to the technical field of all-solid-state lithium ion battery manufacturing. The modified solid electrolyte is of a core-shell structure, an inner core is made of inorganic solid electrolyte, a shell is made of lithium-free metal sulfide, and the modified solid electrolyte can effectively solve the problem that the inorganic solid electrolyte is poor in air stability, so that the corresponding all-solid-state lithium ion battery has relatively excellent cycle performance.

The invention discloses a 3D printing all-solid-state lithium ion battery negative electrode for energy storage and a preparation method thereof, and relates to the technical field of solid-state batteries. The 3D printing lithium ion battery negative plate comprises a current collector, wherein a first 3D printing layer and a second 3D printing layer are sequentially arranged on the current collector; wherein the first 3D printing layer is composed of a structure unit and a gap unit; the second 3D printing layer covers the first 3D printing layer; the first 3D printing layer and the second 3D printing layer respectively comprise a silicon-based material and / or a hard carbon material. According to the 3D printing lithium ion battery negative plate, the negative electrode with the porous structure is combined with the chemical stability of the silicon-based material and / or the hard carbon material layer on the negative electrode, so that the technical problems of poor solid-solid interface contact and volume expansion of an electrode material of an existing all-solid-state battery are solved. The preparation method solves the interface contact problem of a traditional coating process, does not need to depend on a high-cost surface modification technology, reduces the process cost and is suitable for large-scale production.

The invention provides a solid-state battery which comprises a positive electrode, a negative electrode and a solid-state electrolyte layer, and the solid-state electrolyte layer is arranged between the positive electrode and the negative electrode; the positive electrode comprises a positive electrode active material and a first inorganic solid electrolyte; the positive electrode active material comprises a positive electrode active material and a polymer electrolyte coating the surface of the positive electrode active material; the solid electrolyte layer comprises a second inorganic solid electrolyte and an organic solid electrolyte compound; the organic electrolyte compound comprises a porous material and an organic electrolyte. Polymer electrolyte is introduced into the positive electrode, the prepared solid-state lithium ion battery is good in thermal stability, good in oxidation resistance and high in thermal stability, high electrical performance and low-pressure forming can be achieved, the working pressure of the solid-state battery is 3-10 MPa, and low-pressure working can be achieved.

The invention belongs to the technical field of solid-state batteries, and particularly discloses an active halide solid-state electrolyte material and a preparation method and application thereof, the active halide solid-state electrolyte material comprises an active halide solid-state electrolyte represented by the following formula: xLia A.MyN (1-y) B (ym + n-yn), and carrying out solid-phase reaction on the LiaA and the MBm or carrying out solid-phase reaction on the LiaA, the MBm and the NBn in an inert atmosphere to obtain the active halide solid electrolyte. The active halide solid electrolyte material has relatively high ionic conductivity, can be used as an electrolyte material, can also be used as an electrolyte additive self-sacrifice material to be applied to an electrolyte layer, can also be applied to a positive electrode of a solid-state lithium ion battery to provide capacity for the battery, and is beneficial to improving the energy density of the solid-state battery.

The invention belongs to the technical field of lithium metal solid-state batteries, and discloses a method for modifying the performance of a solid-state lithium ion battery under the induction of a high-voltage electric field, which comprises the following steps: carrying out polarization pretreatment on solid-state electrolyte matrix powder in a 1-5kV high-voltage electric field for 1-5 hours; the obtained independent solid electrolyte is placed in a 5-10 kV high-voltage electric field again for polarization treatment for 1-5 h; and assembling the battery by adopting the independent solid electrolyte subjected to high-voltage electric field polarization treatment. Solid electrolyte matrix powder is pretreated by a high-voltage electric field, dissociation of a lithium salt is promoted through the electrostatic force effect between a monomer and the lithium salt, and more free lithium ions are obtained to promote ion transmission in the solid electrolyte; and then, the finally prepared independent solid electrolyte is subjected to reversible high-voltage electric field polarization, so that conduction of lithium ions in the independent solid electrolyte is promoted, and the performance of the solid-state lithium metal battery is improved. In general, the invention provides a novel and simple method for modifying the performance of the solid-state lithium ion battery through high-voltage electric field induction.

The invention discloses a high-flux interface modification method of an oxide-based all-solid-state battery and a lithium ion battery, and belongs to the technical field of solid-state lithium ion batteries. The method comprises the following steps: mixing LTFSI, PVDF-HFP, m-fluorobenzamide and LLZO powder, and adding dimethylformamide to obtain a mixed raw material; adding an organic wet grinding solvent into the mixed raw material, and carrying out ball milling to obtain interface modification slurry; and coating one side of an LLZO electrolyte sheet with the interface modification slurry, and drying to complete interface modification. According to the interface modification method disclosed by the invention, the solid electrolyte has a lithium-loving property, can be in good contact with a metal lithium negative electrode, and can generate LiFamp through an in-situ reaction; and Li3N fills up interface defects and pores, and meanwhile, lithium dendrite growth and electron permeation can be inhibited, so that the interface structure of the obtained modified layer is stable. In addition, the lithium ion conductivity at the interface is further improved, the lithium ion flux at the interface is enhanced, the cycle life of the lithium battery is prolonged, and the preparation method is simple and suitable for industrial large-scale production.

The invention discloses a composite solid electrolyte material with a core-shell structure and a preparation method and application thereof, and belongs to the technical field of solid-state batteries. The material consists of a solid-state electrolyte core and a halide solid-state electrolyte lithium indium chloride shell layer coated on the surface of the solid-state electrolyte core. The excellent water stability and viscoelasticity of the halide electrolyte are utilized to effectively protect the inner core of the solid electrolyte from being eroded by humid air and improve the interface contact with the electrode; meanwhile, the material cost is greatly reduced by using the cheap solid electrolyte core as the main body. The preparation method adopts a simple ball-milling coating process, and is high in controllability. The composite electrolyte material is excellent in comprehensive performance, low in cost and suitable for preparing the high-performance and high-safety solid-state lithium ion battery.

Provided are a cathode active material for a lithium-ion battery having good battery characteristics, a cathode, a battery, and a method for manufacturing the cathode active material. 【Solution means】 A cathode active material represented by the composition shown in the following formula (1), Li a Ni b Co c Mn d Ta e O f (1) (In formula (1), 1.0 ≤ a ≤ 1.07, 0.8 ≤ b ≤ 0.9, b + c + d + e = 1, 1.8 ≤ f ≤ 2.2, 0.001 ≤ e / (b + c + d + e) ≤ 0.005.) Regarding the magnitudes of the coefficient of variation CV1, which is the value obtained by dividing the standard deviation of the average Ta element concentration inside the primary particles by the average Ta element concentration obtained by TEM-EDX analysis, and the coefficient of variation CV2, which is the value obtained by dividing the standard deviation of the average Ta element concentration at the grain boundaries of the primary particles by the average Ta element concentration at the grain boundaries of the primary particles, CV2 > CV1, and the average Ta element concentration at the grain boundaries obtained by TEM-EDX analysis is higher than the Ta element concentration of the cathode active material for a lithium-ion battery analyzed by ICP, a cathode active material for a lithium-ion battery.

The invention belongs to the technical field of solid-state batteries, and provides a lithium-ion solid-state electrolyte and a preparation method and application thereof. The electrolyte comprises a polymer matrix, a lithium salt and a polar organic compound, the polymer matrix includes a first monomer and a second monomer. The preparation method comprises the following steps: mixing a lithium salt and a polar organic compound to obtain a eutectic mixture; mixing a first monomer and a second monomer with the eutectic mixture to obtain a precursor solution; and coating a mold with the precursor solution, and curing. The invention also discloses a solid-state lithium ion battery comprising the electrolyte. The lithium ion solid electrolyte disclosed by the invention is high in room-temperature ionic conductivity, excellent in stretchability, high in breaking strength and tensile elongation and incombustibility. And by introducing the composite material into a porous electrode and tightly combining the composite material with active material particles in the electrode, the problem of stress failure of the electrode under low stacking pressure is solved, and good cycling stability of the all-solid-state battery under the low stacking pressure or even under the condition that no external pressure is applied is realized.

The application discloses a high lithium ion conductivity flame-retardant interface modifier and a preparation method thereof. The material is synthesized by one-pot one-step reaction of phosphorus oxychloride, diamine and alcohol ether compound, and is used in combination with lithium salt to form a flame-retardant interface modifier with high lithium ion conduction function. The molecular structure is rich in ether bonds, which can effectively coordinate with lithium ions, promote the efficient migration of lithium ions at the electrode interface, and significantly improve the cycle stability and rate performance of the solid-state battery. At the same time, the nitrogen and phosphorus elements introduced in the material endow it with excellent flame-retardant properties, which helps to improve the safety of the battery system. In addition, the modifier has good flowability and wettability, which can enhance the interface compatibility between the components in the solid-state battery. The preparation process of the application is simple, controllable, reproducible and low in cost, and is suitable for interface modification of solid-state lithium ion batteries, and has important prospects for promoting the development of high-safety, high-energy-density and low-cost solid-state batteries.

The invention provides a preparation method and application of an all-solid-state lithium ion battery, the all-solid-state lithium ion battery comprises a positive electrode, a negative electrode and a solid electrolyte, and the preparation method comprises the following steps: adding an interface modifier into raw materials of the positive electrode and / or the solid electrolyte, the fluoro anhydride is selected from at least one of difluoroacetic anhydride, trifluoroacetic anhydride, pentafluoropropionic anhydride or heptafluorobutyric anhydride. According to the preparation method and application of the all-solid-state lithium ion battery provided by the invention, the interfacial compatibility of the solid electrolyte with the positive electrode and the negative electrode can be remarkably improved, and the cycle performance of the high-voltage all-solid-state lithium ion battery is improved.

The invention relates to the technical field of solid-state lithium ion battery electrode materials, in particular to a negative electrode plate as well as a preparation method and application thereof. A first laminated structure of the negative pole piece comprises a current collector, an amorphous carbon material layer, a metal lithium layer, a silicon material layer and a lithium alloy layer which are sequentially laminated; the second laminated structure comprises a current collector, a metal lithium layer, an amorphous carbon material layer, a silicon material layer and a lithium alloy layer which are sequentially laminated. According to the negative pole piece, two equivalent laminated structure arrangement modes are provided, an amorphous carbon layer is used as a buffer matrix, a metal lithium layer compensates irreversible capacity, a silicon layer is used as a capacity main body, and a lithium alloy layer is used as an interface stabilizing and dendritic crystal resisting functional layer, so that partition collaboration and interface stress regulation and control of functional components are realized; therefore, the overall volume expansion of the electrode is remarkably inhibited while high specific capacity is ensured, the first-week coulombic efficiency is improved, lithium dendrite growth is effectively prevented, the structural stability of the negative electrode is enhanced, and the cycle life of the negative electrode is prolonged.

Solid-state lithium-ion cells described herein can operate at pressures. In some embodiments, the solid-state lithium-ion cells undergo little or no volume change during cycling. A conditioning process that that significantly improves the performance of a cell at reduced pressures can involve cycling the cell at high pressure.

The invention belongs to the technical field of lithium battery production, and relates to a solid-state lithium ion battery and a preparation method thereof.The solid-state battery comprises a positive electrode, a negative electrode and a solid-state electrolyte membrane, and a functional layer is arranged between the positive electrode and the solid-state electrolyte membrane; the positive electrode comprises a substance A; the solid electrolyte membrane comprises a substance A; the functional layer comprises a substance B; the substance A is a lithium salt, and the substance B is a lithium salt ligand; the substance A is a lithium salt ligand, and the substance B is a lithium salt. The problem that in the prior art, a eutectic electrolyte formed by directly mixing a substance A and a substance B is too high in viscosity, so that the battery forming process is complex is solved. According to the invention, the interface structure is dynamically regulated and controlled by using the eutectic reaction, so that the interface impedance is reduced, the solid-solid interface contact is enhanced, and the lithium ion mobility of the solid-state battery is improved through an ion conduction network formed by eutectic.

The application discloses a method for improving the performance of oxide solid electrolyte by calcium doping, and belongs to the technical field of solid-state batteries. The method comprises the following steps: mixing raw materials containing a calcium source, a sodium source, a rare earth source and a phosphorus source to obtain a precursor; sintering the precursor to obtain a calcium-doped sodium superionic conductor precursor; and performing ion exchange on the precursor and a lithium salt to obtain a calcium-doped oxide solid electrolyte with a chemical formula of Li 3+ x La 1‑x Ca x (PO4)2, and 0 < x <= 0.1. By partially replacing lanthanum ions with calcium ions, lithium vacancies are introduced, the crystal lattice is relaxed, and the lithium ion migration path is optimized by using the charge compensation mechanism, so that the room-temperature ionic conductivity of the material is significantly improved. The method has low raw material cost, simple process and strong universality, can be expanded to various oxide solid electrolyte systems such as NASICON and garnet, and has good application prospect in the field of solid-state lithium ion batteries.

The invention discloses an ultrathin electrolyte membrane and a preparation method thereof, and belongs to the field of all-solid-state lithium ion batteries. The method comprises the following steps: Li salt preparation: mixing and stirring dichloromethane and LiTFSI in proportion; preparing a mixed binder solution, namely mixing and stirring nitrile rubber (NBR binder) and dichloromethane; electrolyte slurry is prepared, wherein the mixed binder solution, LPSCl solid electrolyte, PEGDA and Li salt are mixed and stirred according to the specific mass fraction; and preparing an electrolyte membrane, adding AIBN into the slurry, and blade-coating the slurry on a heating plate for curing. According to the invention, through the dispersion effect of the NBR binder and the ductility of the PEGDA polymer, the flexibility and mechanical properties of the electrolyte membrane are significantly improved, the interface impedance is reduced, the preparation of the ultrathin and large-area electrolyte membrane is realized, and the preparation method is suitable for soft package batteries and large-scale production.

A lithium-based solid-state anode assembly for use in a lithium-ion battery. The anode is formed from an open-pore fibrous ceramic or polymer framework and a lithium-affine active surface material. The open space within the fibrous framework and a lithium-affine coating deposited on the surface of the fibrous framework allow free transport of solid-state lithium ions within the anode. In the solid state, the lithium battery can achieve higher capacity per unit weight, faster charging, and greater durability against harsh handling and temperature. A method for producing a solid-state lithium battery having such an anode is also provided.

An assembly of solid lithium-based anodes for forming a lithium-ion battery. The anodes are formed with a fibrous ceramic or polymer framework containing open spaces and an active surface material with lithophilic properties. The open spaces within the fibrous framework and the lithophilic coatings deposited on the framework surface allow for the free transport of solid lithium ions into the anodes. In the solid state, lithium batteries can achieve higher capacity per weight, charge faster, and be more resistant to handling and extreme temperatures. A method for manufacturing a solid-state lithium battery having such an anode.

The present application discloses a battery pack having a double-layer structure, a solid-state lithium-ion battery, and an electric vehicle. The battery pack having a double-layer structure comprises a lower-layer module structure, an upper-layer module structure, modules, same-layer connection copper bars, and cross-layer connection copper bars. The lower-layer module structure is divided, by a middle transverse beam and a middle longitudinal beam, into three regions for placing modules: a first region, a second region, and a third region; the first region is located on one side of the middle transverse beam, and the second region and the third region are located on the other side of the middle transverse beam and are respectively located on two sides of the middle longitudinal beam; the upper-layer module structure is divided, by a side transverse beam, into two regions for placing modules: a fourth region and a fifth region; the connection sequence of the modules in the regions is: the first region, the second region, the fifth region, the third region, and the fourth region; the first region and the second region are connected by using a same-layer connection copper bar; and the second region and the fifth region, the fifth region and the third region, the third region and the fourth region, the fourth region and the first region are all connected by using cross-layer connection copper bars, and the module in the fourth region that is close to a BDU is connected back to the positive electrode of the BDU in the first region by using a cross-layer connection copper bar.

The application discloses a high-safety semi-solid lithium ion battery and a preparation method thereof. The core structure of the battery comprises a positive electrode, a positive electrode side electrolyte in contact with the positive electrode, an ion selective barrier, a negative electrode side electrolyte in contact with the ion selective barrier, and a negative electrode. The positive and negative electrode side electrolytes are independent gel / quasi-solid state systems with differentiated components and functions, and respectively contain functional additives for high voltage stability and negative electrode interface optimization. The key component ion selective barrier is a dense inorganic or composite film that can conduct lithium ions but effectively block the mutual diffusion of electrolyte components on both sides. The application fundamentally solves the performance compromise problem of a single electrolyte by constructing independent optimal electrochemical environments for the positive and negative electrodes of the lithium ion battery, and cooperatively realizes excellent high voltage stability, cycle life and intrinsic safety, and is particularly suitable for high energy density and high safety requirement application scenarios.

The invention belongs to the technical field of solid-state lithium ion batteries, and relates to a preparation method of a pre-lithiated negative electrode for a solid-state battery and the solid-state battery. The method comprises the following steps: mixing liquid metal with a solvent, and adding a polymer to obtain a mixed dispersion liquid; preparing a polymer liquid metal fiber skeleton from the mixed dispersion liquid through an electrostatic spinning method; mixing and stirring an active material, a binder and a conductive agent to obtain negative electrode slurry; preparing a composite negative electrode active layer from the PET substrate, the polymer liquid metal fiber skeleton and the negative electrode slurry; and finally, rolling and compounding the composite negative electrode active layer and the lithium-copper composite belt to obtain the pre-lithiated negative electrode. A high-conductivity liquid metal polymer lithium-loving framework and a framework for buffering volume expansion are constructed in the negative electrode by adopting an electrostatic spinning technology, the framework can be used as lithium-loving sites of lithium ions to induce uniform deposition of the lithium ions, and the volume expansion in the charging and discharging process of the negative electrode can be effectively buffered by the self-healing capability of the liquid metal; the cycle life and the stability of the battery are improved.

This application discloses an all-solid-state sulfide electrolyte layer, its preparation method, and a solid-state lithium-ion battery. In this application, the all-solid-state sulfide electrolyte layer includes a porous framework layer and an electrolyte filling the pores of the porous framework layer; the porous framework layer is obtained by creating pores in the sulfide electrolyte material; the sulfide electrolyte material is Li6PS5Cl or Li 10 SnPS 12 Li6PS5Br or Li 10 GeP2S 12 The electrolyte is selected from Li6PS5Cl and Li 10 SnPS 12 Li6PS5Br and Li 10 GeP2S 12 In at least one of the following methods, the present application alleviates the mismatch between electrolyte particles during the dry preparation of the electrolyte layer by casting a sulfide skeleton layer with a sulfide electrolyte, reduces the porosity of the electrolyte particles, makes the connection between electrolyte particles tighter, and improves the conductivity of the electrolyte layer.

The application relates to a sulfide solid electrolyte for inhibiting dendrite growth, a preparation method and application, and belongs to the technical field of lithium ion solid-state batteries. The chemical general formula of the sulfide solid electrolyte is aMCl b -Li 7‑c PS 6‑c X c wherein M is one or more of Mg, Ca, Sr, Ba, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er and Tm, MCl b accounts for 1-40 wt.% of the whole electrolyte, X is one or more of Cl, Br and I, and 1<=c<=2. The sulfide solid electrolyte has high room-temperature ionic conductivity and good dendrite inhibition capacity, can greatly reduce the short-circuit risk of prepared lithium ion batteries in the process of high current density and long-time circulation, and has simple synthesis method, can be used for preparing full-solid-state lithium ion batteries, and has good practicability.

The invention discloses a sulfide solid-state electrolyte for inhibiting dendritic crystal growth, a preparation method and application, and belongs to the technical field of lithium ion solid-state batteries. The general chemical formula of the sulfide solid electrolyte is aMClb-Li7-cPS6-cXc, M is one or more of Mg, Ca, Sr, Ba, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er and Tm, MClb accounts for 1-40 wt% of the mass of the whole electrolyte, X is one or more of Cl, Br and I, and c is larger than or equal to 1 and smaller than or equal to 2. The sulfide solid electrolyte has high room temperature ionic conductivity and good dendritic crystal inhibition capability, can greatly reduce the short circuit risk of the prepared lithium ion battery in the high current density and long-time cycle process, is simple in synthesis method, can be used for preparing an all-solid-state lithium ion battery, and has good practicability.