164results about How to "Improve air stability" patented technology

The invention discloses a carbon-coated sodium ferrous sulfate phosphate positive electrode material as well as a preparation method and application thereof. The carbon-coated sodium ferrous sulfate phosphate positive electrode material is square flaky particles formed by coating sodium ferrous sulfate phosphate with a conductive carbon material and irregular aggregates of the square flaky particles. The molecular formula of the sodium ferrous sulfate phosphate is Na (6-2x + y) Fex( SO4) (3-y) (PO4) y, x is more than 0 and less than 3, and y is more than 0 and less than or equal to 0.5. The invention also discloses a preparation method and application of the carbon-coated sodium ferrous sulfate phosphate positive electrode material. The positive electrode material has the advantages of phosphate and sulfate positive electrode materials, the voltage platform is high, the conductivity is excellent, the air stability is good, and the assembled battery has excellent chemical sodium storage performance, high discharge specific capacity, highly reversible charge-discharge reaction and good cycle performance. The method is simple in process, high in feasibility, low in raw material cost and easy to realize industrial production through a solution system.

The invention belongs to the technical field of batteries, and particularly relates to a lithium ferrite lithium supplement agent and a preparation method and application thereof. Compared with the prior art, a solid electrolyte coating layer is formed on the surface of the carbon-doped lithium iron oxide material through a low-temperature molten salt method, so that air can be effectively isolated, the air stability of the material is improved, the lithium removal phenomenon is reduced, and the structural integrity and lithium supplement performance of the material are kept; and the lithium ferrite lithium supplement agent combines the high theoretical lithium supplement capacity of Li5FeO4 and the excellent ionic conductivity of the solid electrolyte, so that the electrochemical performance of the material can be improved while the high lithium supplement capacity is maintained, and a new technical scheme is provided for commercial application of the high-energy-density lithium ion battery.

The invention discloses a double-layer coated lithium supplement agent as well as a preparation method and application thereof. The double-layer coated lithium supplement agent comprises a lithium supplement agent inner core and a first layer coated on the surface of the lithium supplement agent inner core, and the surface of the first layer is coated with a second layer; the first layer comprises a polymer and a lithium salt, the polymer has a polar group, the second layer comprises a hydrophobic material, a hydrogen bond and / or a coordinate bond is formed between the lithium salt and the polymer, and a coordinate bond is formed between the lithium salt and the hydrophobic material. According to the lithium supplement agent disclosed by the invention, through double-layer coating, the first layer has a lithium ion conduction enhancement function and the second layer has a hydrophobic protection function, and the two layers have a synergistic effect, so that the lithium ion conduction efficiency of the lithium supplement agent is improved, the air stability of the lithium supplement agent is improved, and the service life of the lithium supplement agent is prolonged. And good compatibility between the electrolyte and the first layer is also ensured, so that the problems that the safety of the battery is reduced and the cycle life of the battery is shortened due to side reaction are avoided.

The invention provides a preparation method of an electron-ion mixed conductor sulfide electrolyte material, which is characterized by comprising the following steps: taking a sulfide solid electrolyte as an inner core, taking a two-dimensional transition metal layered material MXene as a surface coating layer, and coating the surface of the inner core with the two-dimensional transition metal layered material MXene, and carrying out ball milling and calcining to obtain the electron-ion mixed conductor sulfide electrolyte material. The two-dimensional transition metal layered material MXene is used as a surface coating layer, the air stability of the sulfide solid electrolyte is improved, calcination treatment is carried out, S in the sulfide solid electrolyte is combined with metal ions in MXene, the sulfide solid electrolyte has high electronic conductivity, the appearance of a space charge layer can be inhibited, and the performance of the sulfide solid electrolyte is improved. The electronic conductivity of the positive electrode is improved, the multiplying power of a battery cell is improved, the content of conductive carbon is reduced, and the intrinsic ion conductivity of sulfide electrolyte can be kept to the maximum extent.

The invention discloses a diaphragm-coated MOFs glass in-situ polymerization solid electrolyte and a preparation method and application, and relates to the technical field of composite solid electrolytes.The diaphragm-coated MOFs glass in-situ polymerization solid electrolyte comprises a polymer monomer, MOFs glass, metal salt and a binder, MOFs glass powder, the binder and a solvent are evenly mixed according to the proportion, then the two faces of a diaphragm are coated with the mixture, the diaphragm coated with the MOFs glass is obtained through drying, and the diaphragm coated with the MOFs glass is obtained. And adding a polymer monomer with a certain concentration, a metal salt and an initiator solution to the diaphragm coated with the MOFs glass, and carrying out in-situ polymerization on the monomer in the battery on the MOFs glass diaphragm under the condition of thermal initiation or photo-initiation, so as to obtain the diaphragm-coated MOFs glass in-situ polymerization solid electrolyte. By adding the MOFs glass, the ionic conductivity of the polymer is remarkably improved, and the mechanical strength of the composite solid electrolyte is enhanced, so that the metal dendritic crystal inhibition capability is improved, and the problems of poor interface contact, poor ionic conduction capability, low mechanical strength and the like of the existing solid electrolyte at present are solved.

The invention belongs to the technical field of battery materials, and particularly relates to an MXene material composite nickel-iron-manganese-based positive electrode material and a preparation method and application thereof. The chemical formula of the MXene material composite nickel-iron-manganese-based positive electrode material is NaNiaFebMncTMdO2 (at) MXene, TM is one or more of Mg, Al, Ti, Zn, Zr, Cu, Nb, W and Mo, values of a, b, c and d depend on charge balance, M in MXene is one or more of Ti, Nb, V, Mo, Ta, Cr and Hf, X is C or N, and ene represents a structural unit of graphene. MXene is compounded with the nickel-iron-manganese-based positive electrode material, so that the situation that the nickel-iron-manganese-based positive electrode material is in contact with water and CO2 in air to inhibit the interface side reaction between electrolyte and the nickel-iron-manganese-based material can be reduced, and excellent cycling stability is shown under high voltage.

The invention relates to the technical field of positive electrode materials, and discloses a preparation method of a carbon-coated fluorine-doped sodium ferric sulfate positive electrode material, which comprises the following steps: step 1, adding an iron source, a sodium source, a sulfur source, a carbon source and a fluorine source into deionized water, and heating and stirring to completely dissolve the raw materials to obtain a solution A; 2, converting the solution A into precursor powder B by using a spray drying method; and 3, calcining the precursor powder B in an inert atmosphere, and crushing and grinding the obtained product to obtain the carbon-coated fluorine-doped Na2Fe2 (SO4) 3 positive electrode material. The F element with higher electronegativity than the S element is introduced, so that the overall electron distribution of the material is changed, the structural stability is improved, and the high-conductivity carbon protection layer is coated on the surface of the active material to form a conductive network, so that the resistance is reduced, the volume expansion is relieved, and the battery capacity and the cycling stability can be obviously improved.

The invention relates to the technical field of batteries, in particular to a sodion positive electrode precursor material and a preparation method and application thereof. The chemical formula of the sodium ion positive electrode precursor material is Ni F Mn < c > M < d > (O < H >) < 2 > (at) Ni < a-x > F Mn < c > M < d + x > (O < H >) < 2 >, and M is an element doped according to a preset gradient concentration and comprises one of Zn, Cu and Mg; 0.2 < = a < = 0.8, 0lt; b < = 0.5, 0lt; c < = 0.5, 0 < = d < = 0.1, and a + b + c + d = 1, 0lt; x is less than or equal to 0.2, and the morphology is a sphere-like morphology; the invention also provides a preparation method of the sodion positive electrode precursor material, and the prepared sodion positive electrode precursor material has the structural characteristics of uniform phase, high tap density and gradient concentration increase of doped elements from the inner core to the shell, so that the inner core has high specific capacitance, and the shell has high stability; and the preparation process is simple and easy for large-scale production.

The invention relates to the field of energy materials and secondary batteries, and discloses a preparation method of an in-situ interface residual alkali conversion stable secondary battery positive electrode material. The chemical expression is AMxTMO2, and the material is of a polymer / layered structure. Wherein x is more than 0.5 and is a layered oxide positive electrode material; aM is one or more of Li and Na; and TM is one or more of transition metal elements of Ni, Co, Mn, Fe, Cu, Zn, Cr and Ti. The process comprises the steps of precursor material preparation, positive electrode material sintering, coating treatment and low-temperature calcination. Wherein the coating treatment comprises the following steps: 1, inorganic fluoride treatment; and 2, organic solvent treatment. According to the process disclosed by the invention, residual alkali on the surface of the layered oxide positive electrode material is subjected to in-situ conversion to form a heteroepitaxial organic polymer coating, so that the layered oxide positive electrode material with a stable interface for the secondary battery is obtained. The process is simple and controllable, the air stability of the positive electrode material after in-situ conversion can be effectively improved, and the actual production application of the layered oxide positive electrode material is promoted.

The invention relates to a sulfide solid-state electrolyte and a preparation method thereof, an all-solid-state battery and electric equipment, the sulfide solid-state electrolyte comprises an inner core and N shell layers sequentially coating the surface of the inner core, N is an integer greater than or equal to 2, the inner core and the shell layers are sulfide solid-state electrolytes doped with doping elements, the crystal structures of the inner core and the shell layers are the same, the inner core is used as the innermost layer, and in the direction from the innermost layer to the Nth shell layer, the molar weight of the doped element is increased layer by layer, and the total molar weight of the phosphorus element and the sulfur element is reduced layer by layer. The ionic conductivity of the sulfide solid electrolyte cannot be reduced, the air stability of the sulfide solid electrolyte can be remarkably improved, the electrochemical performance of an all-solid-state battery can be remarkably improved when the sulfide solid electrolyte is used for assembling the all-solid-state battery, and the service life of the all-solid-state battery is prolonged. And the all-solid-state battery does not need to be assembled in a protective atmosphere.

The invention provides a solid electrolyte and a preparation method thereof, a diaphragm, a battery and power-related equipment, and relates to the technical field of lithium batteries. The solid electrolyte is of a core-shell composite structure with LATP as a core and Mg-Sn alloy as a shell wrapping the outer surface of the core. According to the solid electrolyte with the core-shell structure, the LATP serves as the core, the Mg-Sn alloy serves as the shell, air stability is enhanced, Li2CO3 impurities are prevented from being generated, high ionic conductivity and a wide electrochemical window are kept, and stability and mechanical strength are improved. The corrosion resistance and tear resistance of the alloy enhance the safety of the battery, and the aluminum element in the LATP improves the strength of the alloy and optimizes the performance and charge-discharge efficiency of the battery.

The invention relates to the technical field of hydrogen storage materials, and discloses a polymer-doped aluminum hydride hydrogen storage material and a preparation method thereof, comprising a composite hydrogen storage material, wherein the composite hydrogen storage material is composed of a light metal hydride and a polymer, wherein the light metal hydride comprises at least one of LiH, MgH2 or AlH3, and the polymer comprises at least one of PMMA, ABS or PVP, wherein the mass ratio of the light metal hydride to the polymer is 1:0.1-100, and the composite hydrogen storage material is composed of AlH3 and PMMA, and the composition expression of the composite hydrogen storage material is AlH 3 + x wt.%PMMA, where x represents the mass fraction of PMMA in the composite hydrogen storage material, and 1

The invention provides a halide solid-state electrolyte and a preparation method and application thereof. The halide solid-state electrolyte comprises a halide solid-state electrolyte inner core and a halide solid-state electrolyte outer core, and the hydrophobic layer is uniformly coated on the halide solid electrolyte core, and the hydrophobic layer comprises bis-hexadecyl phosphate. According to the halide solid electrolyte as well as the preparation method and the application thereof, the air stability of the halide solid electrolyte can be remarkably improved, the cycle performance of an all-solid-state lithium ion battery is improved, the manufacturing process is simple, and the cost is relatively low.

The embodiment of the invention provides a solid electrolyte and a preparation method and application thereof, and relates to the technical field of battery materials. The solid electrolyte comprises a halide electrolyte and a composite coating layer arranged on the surface of the halide electrolyte, wherein the composite coating layer comprises lithium fluoride and aluminum oxide in a mass ratio of (1-9): (9-1). The solid electrolyte has excellent ionic conductivity, oxidation potential and air stability, and is beneficial to realizing high-rate charge-discharge performance of the battery.

The invention provides a solid electrolyte membrane and a preparation method and application thereof. The solid electrolyte membrane comprises a binder; the molecular formula of the sulfide solid electrolyte is Li < f > P < 1-g > Eg < S < w > O < g > Q < z >; wherein, 5lt; flt; 10; 0 lt; glt; 1, 3lt; wlt; 6, 4lt; w + glt; 6, 0lt; zlt, zlt; 2; e is selected from one or more of Mg, Ca, Sr, Ba, Zn, Cr, Sn or Pb; q is selected from one or more of Cl, Br or I; the ionic conductivity of the solid electrolyte membrane is 1 * 10 <-3 > S / cm to 2 * 10 <-2 > S / cm. According to the solid-state electrolyte membrane and the preparation method and application thereof, the stability of the conductivity of the solid-state electrolyte membrane can be improved, the air stability is enhanced, the service life of an all-solid-state lithium ion battery is prolonged, and the safety of the all-solid-state lithium ion battery is improved.

The invention discloses a sodium ion battery single crystal positive electrode material and a preparation method and application thereof, and the material realizes high working voltage, excellent cycling stability and rate capability by accurately controlling chemical composition and microstructure. According to the preparation method, the problem that part of doped metal ions cannot be synthesized into the precursor through a coprecipitation method or synthesized into the precursor in a high proportion can be solved, the microstructure and element distribution uniformity of the material can be effectively controlled, and the performance is more excellent than that of a conventional multi-component oxide mechanical solid-phase synthesis method; the addition of the molten salt can optimize the single crystal morphology and reduce the sintering temperature, the doping of the M element can stabilize the structure and improve the air stability and the cycling stability under high voltage, and the coating of the oxygen-containing compound can reduce the side reaction of the positive electrode material and an electrolyte interface and the electrochemical performance under high voltage. The first-circle discharge specific capacity is 173.34 mAh / g, and the capacity retention ratio is still 91.5% after 100 times of cyclic charge and discharge.

The invention discloses a micro-nano composite sulfide solid electrolyte and a preparation method and application thereof. The micro-nano composite sulfide solid electrolyte comprises the following raw materials: a micron-scale sulfide solid electrolyte, a nano-scale sulfide solid electrolyte and a modified additive, the modified additive comprises modified zirconium oxide and / or modified zirconium oxide aluminum oxide; the micron-sized sulfide solid electrolyte is used as a structural main body of the micro-nano composite sulfide solid electrolyte, and the nano-sized sulfide solid electrolyte and the modified additive are distributed in the micron-sized sulfide solid electrolyte in a penetrating manner; the micron-sized sulfide solid electrolyte is prepared by adopting a ball-milling solid-phase synthesis method, and the nano-sized sulfide solid electrolyte is prepared by adopting a liquid-phase synthesis method. The micro-nano composite sulfide solid electrolyte provided by the invention has excellent high-temperature performance, rate performance, cycle performance and mechanical performance, and can be widely applied to the field of battery manufacturing.

The invention provides a sulfide solid electrolyte as well as a preparation method and application thereof. The molecular formula of the sulfide solid electrolyte is LifP1-gEgSwOgQz, wherein, 5lt; flt; 10; 0 lt; glt; 1, 3lt; wlt; 6, 4lt; w + glt; 6, 0lt; zlt, zlt; 2; e is selected from one or more of Mg, Ca, Sr, Ba, Zn, Cr, Sn or Pb; q is selected from one or more of Cl, Br or I. According to the sulfide solid electrolyte and the preparation method and application thereof, the stability of the conductivity of the sulfide solid electrolyte can be improved, the air stability can be enhanced, the electrolyte / active substance interface property can be improved, the service life of an all-solid-state lithium ion battery can be prolonged, and the safety of the all-solid-state lithium ion battery can be improved.

The invention belongs to the technical field of lithium batteries, and particularly relates to a high-temperature-resistant all-solid-state lithium battery and a preparation method and application thereof. The high-temperature-resistant all-solid-state lithium battery provided by the invention comprises a negative electrode layer, an electrolyte layer and a positive electrode layer which are sequentially stacked, the component of the negative electrode layer is lithium indium alloy; the electrolyte layer comprises a sulfide layer and a halide layer which are stacked in sequence; the component of the sulfide layer is sulfide solid electrolyte; the component of the halide layer is a first halide solid electrolyte; the sulfide layer is located between the halide layer and the negative electrode layer to form a structure of the negative electrode layer, the sulfide layer, the halide layer and the positive electrode layer; and the positive electrode layer comprises a positive electrode active material and a second halide solid electrolyte. The high-temperature-resistant all-solid-state lithium battery provided by the invention has good high-temperature stability.

The embodiment of the invention discloses a positive electrode material, a preparation method thereof and application of a sodium battery. The positive electrode material is characterized in that the positive electrode material comprises a layered oxide core and a shell coating the surface of the core, the core comprises Na [alpha] FexMnyMzO2, the shell comprises tunnel-type Na [beta] MnO2, M comprises at least one of Li, Ni, Cu, Mg, Zn, Al or Ti, and 0.66 lt; alpha < = 1, x + y + z = 1, and beta < = 0.30 < = 0.66. According to the positive electrode material disclosed by the invention, the Na [beta] MnO2 with the tunnel type structure is coated outside the inner core with the layered structure, and the positive electrode material is applied to a sodium battery (such as a sodium ion battery), so that the air stability of the inner core with the layered structure can be effectively improved, the internal structure change can be effectively inhibited, the reaction kinetics can be improved, and a stable protection interface can be constructed on the surface; the cycle life is prolonged, and the cycle stability of the battery is enhanced.

The invention relates to the technical field of sodium ion batteries, in particular to a sodium ferric sulfate positive electrode material and a preparation method thereof, a positive electrode plate and a sodium ion battery, the sodium ferric sulfate positive electrode material comprises a sodium ferric sulfate matrix, the surface of the sodium ferric sulfate matrix is coated with a carbon coating layer, the sodium ferric sulfate matrix is doped with a P element, and the carbon coating layer is coated with a carbon coating layer. And an N element is doped on the carbon coating layer. The sodium ferric sulfate matrix is doped with the P element, and the carbon coating layer is doped with the N element, so that the rate capability and the cycling stability of the sodium ferric sulfate positive electrode material are improved.

The invention relates to a metal and non-metallic element co-doped high-entropy sulfide solid electrolyte and a preparation method and application thereof. The general formula is Li < 10 + a-b-c > NabX < c > M < 1-d > Q < d > Te < e > O < f > P < 2 > S < 12-e-f-g > Z < g >, wherein X is K, Mg, Ca, Al, Fe or Zn; m is one or more of Ge, Sn and Si; q is at least one of Sb, Bi, As, Y and La; z is at least one of F, Cl, Br and I; wherein 0 lt; b < = 3, 0 < = c < = 1, 0 < = dlt; 1, 0lt; e < = 2, 0lt; f < = 1, 0lt; g < = 3; when the valence of the X element is + 1, a = 2e + d-g; when the valence of the X element is + 2, a is equal to 2e + d-c-g; and when the valence of the X element is + 3, a is equal to 2e + d-2c-g. The high-entropy sulfide solid electrolyte has relatively high ionic conductivity, the room-temperature ionic conductivity of the high-entropy sulfide solid electrolyte can reach 1.85 * 10 <-2 > S cm <-1 >-3.5 * 10 <-2 > S cm <-1 >, and the high-entropy sulfide solid electrolyte has excellent air stability.

The invention discloses an oxygen element doped sulfide electrolyte, a preparation method and application thereof, the surface of the sulfide electrolyte contains a uniform oxide coating layer, and the interior of the sulfide electrolyte is doped with an oxygen element; the thickness of the oxide surface coating layer is 1-50nm, the oxygen element of the oxide-doped sulfide electrolyte is in gradient distribution, the structure can improve the air stability of the sulfide electrolyte, and the structure also can ensure that the oxygen coating shell is not easy to fall off because the doped oxygen element is less in amount and less in ionic conductivity loss, so that the performance of the sulfide electrolyte is improved. And the air stability of the sulfide electrolyte is further improved.

The invention provides a carbon coating method of lithium-rich lithium ferrite, an obtained material and a lithium ion battery, and belongs to the technical field of lithium ion battery materials. According to the method, a physical vapor deposition method is adopted for carrying out carbon film deposition treatment on lithium ferrite particles which circularly flow in a physical vapor deposition coating device; and after deposition is completed, turning off a device power supply, and cooling to room temperature to obtain the carbon-coated lithium ferrite material. The obtained carbon-coated lithium ferrite material can effectively make up for active lithium lost in the first charging and discharging process of a lithium battery, the energy density of the lithium battery is improved, and the carbon-coated lithium ferrite material has good storage stability and conductivity in air.

The invention discloses a modified sodium ion battery positive electrode material, a preparation method thereof and a sodium ion battery. The modified sodium ion battery positive electrode material is of a core-shell structure, takes NaxTMO2 as a core, and takes an A-rich spinel phase compound as a coating layer; the chemical formula is NaxTMO2 (at) A, NaxTMO2 is a layered oxide, x is larger than or equal to 0.5 and smaller than or equal to 1.2, TM is an electrochemical active and / or non-active metal element, and A is an A-rich spinel phase compound. A uniform A-rich spinel phase compound is formed on the surface of the layered oxide NaxTMO2 by adopting a high-temperature solid-phase sintering method, so that the interface conductivity of particles can be effectively improved, the air stability of the positive electrode material can be improved, and the rate capability and the cycling stability of the sodium ion battery can be further improved; and at a high temperature, sodium carbonate, sodium hydroxide and other residual alkalis are decomposed, and free Na < + > on the surface enters a material body phase again, so that structural recombination is realized, the residual alkali content is reduced, the capacity of the sodium ion battery is improved, and the processing performance is improved.

The invention discloses a nanoscale lithium oxalate / carbon composite lithium supplement agent, a preparation method and application of the nanoscale lithium oxalate / carbon composite lithium supplement agent in a lithium ion battery. The lithium oxalate powder is prepared into the lithium oxalate saturated aqueous solution, then the amphiphilic surfactant is added, overgrowth of crystals of the lithium oxalate in the drying process can be limited, the particle size of the lithium oxalate is effectively reduced, and therefore the ion transmission path is shortened. Besides, after the carbon material is added, the polar group of the amphiphilic surfactant promotes the uniform distribution of the carbon material, so that a three-dimensional conductive network structure is constructed, the electron transmission path is effectively shortened by the structure, and the conductivity of the material is remarkably improved. The lithium supplement agent prepared by the invention has remarkable electrochemical performance, and the decomposition potential of the lithium supplement agent is successfully reduced to about 4.33 V, which conforms to the working voltage range of a positive electrode material and an electrolyte of a commercial lithium ion battery. The method provided by the invention has the advantages of simple operation and no need of additional introduction of a metal catalyst, and can effectively reduce the raw material cost.

The invention belongs to the technical field of perovskite batteries, and particularly relates to a perovskite precursor and a preparation method thereof. According to the invention, the perovskite precursor is prepared into an emulsion form, Ge < 4 + > is adopted to prepare the perovskite precursor, and the silicon dioxide nano oxide, the additive and the stabilizer are introduced into the emulsion precursor, so that the moisture resistance and hydrophobicity of the perovskite thin film are improved, and tiny liquid drops in the emulsion are used as a template for perovskite crystal growth, so that the perovskite thin film is prepared. The size and form of perovskite crystals are controlled, the silicon dioxide nano oxide can passivate defect states on the surface of perovskite and reduce recombination of electron-hole pairs, and a precursor in the emulsion is also beneficial to passivating surface defects in the curing process, reducing defect state density and improving device performance. The device prepared by using the perovskite precursor prepared by the invention has good photoelectric property and stability.

The invention relates to a sodium ferric sulfate material as well as a preparation method and application thereof, and belongs to the technical field of energy storage. The sodium ferric sulfate material provided by the invention comprises a sodium ferric sulfate crystal phase, and at least part of the surface of the sodium ferric sulfate crystal phase is coated with a sodium ferric sulfate amorphous phase. According to the invention, at least part of the surface of the sodium ferric sulfate crystal phase is coated with the high-stability sodium ferric sulfate amorphous phase, so that contact between internal sodium ferric sulfate crystal phase particles and air is effectively isolated, and the air stability of the sodium ferric sulfate material is improved; and the amorphous phase provides abundant vacancy defects, so that the metal migration is easier than that in the crystalline phase, and the electrode dynamics is promoted. The sodium ferric sulfate material provided by the invention has good air stability, rate capability and long cycle performance, the material can be placed in air for a long time, the electrochemical performance is not obviously degraded after the material is placed for 12 months, and the material can be used for preparing a sodium ion battery with high performance.

The invention relates to the technical field of batteries, in particular to a solid electrolyte, a preparation method thereof and a solid-state battery. A solid state electrolyte includes: a matrix including a halide electrolyte; the lithium ion battery comprises a substrate and a coating layer, the coating layer coats at least part of the surface of the substrate, the coating layer comprises a lithium element, a fluorine element, an oxygen element, a boron element and an M element, and the M element comprises at least one of Al, Nb, Ta or Zr. The preparation method of the solid electrolyte comprises the following steps: mixing a plurality of halide electrolyte synthesis raw materials in an inert atmosphere to obtain a precursor; mixing the precursor with fluoride and boride to obtain a mixture; and heating the mixture to obtain the solid electrolyte. The air stability of the halide electrolyte can be improved, the ionic conductivity of the electrolyte is ensured, and the cycle performance of the battery is improved.

The invention provides a composite positive electrode lithium supplementing material, the chemical general formula of the composite positive electrode lithium supplementing material is Li < x > M < y > N (1-y) O < z > (at) Li C O < c >, and the composite positive electrode lithium supplementing material comprises an inner core and a shell coating the surface of the inner core, the inner core is a doped inorganic ternary compound, the chemical general formula of the doped inorganic ternary compound is LixMyN (1-y) Oz, and the outer shell is an organic lithium supplement agent, and the chemical general formula of the organic lithium supplement agent is LiaCbOc. The composite positive electrode lithium supplement material has good stability and high gram volume, the coating of the shell can effectively prevent the material from being contacted with wet air, and doping is carried out in the core material, so that the conductivity of a positive plate is improved; meanwhile, the composite positive electrode lithium supplementing material has no gel condition in a conventional environment, and the prepared composite positive electrode lithium supplementing material can effectively supplement active lithium consumed by a negative electrode SEI membrane, so that the energy density and high-temperature cycle performance of the whole battery are improved.