44results about How to "Reduce interface side reactions" patented technology

The invention relates to the technical field of solid electrolyte, and discloses a double-layer solid electrolyte membrane, a preparation method thereof and an all-solid-state battery. The double-layer solid-state electrolyte membrane comprises a first solid-state electrolyte layer and a second solid-state electrolyte layer which are overlapped with each other, the first solid-state electrolyte layer comprises hydride solid-state electrolyte, and the second solid-state electrolyte layer comprises halide solid-state electrolyte; the hydride solid electrolyte comprises Li < 7-a > P (BH4) S < 6-a > and / or Li < 7-a-b > P (BH4) S < 6-a-b > X , a < = 2, 0lt; blt; 2. The interface between the double-layer solid-state electrolyte membrane and the positive electrode and the interface between the double-layer solid-state electrolyte membrane and the negative electrode have good interface stability, and the interface side reaction between the two solid-state electrolyte layers is less, so that the solid-state battery has high coulombic efficiency and cycling stability.

The invention relates to a preparation method of a silicon-carbon negative electrode material capable of reducing interface side reaction, which comprises the following steps: (S1) carrying out chemical vapor deposition on porous carbon by using organic silicon source gas to enable amorphous silicon to be attached in pores of the porous carbon to obtain a silicon-carbon composite material; and (S2) mixing a passivating agent with the silicon-carbon composite material, and then carrying out gradient heat treatment to obtain the silicon-carbon negative electrode material capable of reducing the interface side reaction, the passivating agent is compounded by ammonium carbonate and / or ammonium bicarbonate, C2-C8 aliphatic polybasic acid and organic salt of lithium according to the mass ratio of 1: (1.5-3): (0.8-1.5). All the components in the passivator cooperate with one another, surface amorphous silicon in porous carbon is partially passivated to form a uniform and compact passivation layer, and a small amount of carbon coating layers coating the surface of the porous carbon are formed in the passivation process, so that the interface side reaction of the material is obviously reduced.

The invention relates to the field of sodium ion battery positive electrode materials, in particular to an rGO-coated Mn-Ti co-doped sodium ferric fluorophosphate material as well as a preparation method and application of the rGO-coated Mn-Ti co-doped sodium ferric fluorophosphate material. The chemical formula of the catalyst is Na2FexMnyTizPO4F (at) rGO, wherein 0.05 < = y < = 0.10, 0.02 < = z < = 0.05, and x + y + z = 1; by optimizing the raw material proportion and sintering conditions and adopting the two-time sintering process of low-temperature pre-sintering-ball milling in the inert atmosphere-secondary sintering, the raw materials are uniformly mixed on the premise that the raw materials are not oxidized and deteriorated by air, the contact area is increased, efficient ion migration and lattice formation among reactants are facilitated, and the purity of the product is improved. The anion F with strong electronegativity is successfully introduced to form a relatively strong binding force with a phosphate group, so that the generation of pyrophosphoric acid is inhibited, and the crystal structure is optimized; through Mn-Ti co-doping, the stability of a voltage platform and a material structure is effectively improved, so that the material has relatively high energy density and relatively long cycle life; meanwhile, a stable interface layer can be formed on the surface of the material through two-dimensional rGO coating, interface side reactions are reduced, and the cycling stability is improved.

The invention discloses a lithium negative electrode with a multi-layer composite artificial SEI film and a preparation method and application of the lithium negative electrode, and relates to the technical field of lithium batteries. Comprising a porous material, a lithium-loving layer, lithium metal and an inorganic composite material, a lithium-loving layer and lithium metal are sequentially deposited on one side of the porous material, and an inorganic composite material is deposited on the other side of the porous material; the porous material is at least one of a porous carbon material and a porous silicon material; the inorganic composite material is at least five of LiF, Li2O, Li3N, Li2CO3, Li2S, Li10GeP2S12 and Li3PO4, and the inorganic composite material is at least five of Li2CO3, Li2S, Li10GeP2S12 and Li3PO4. According to the invention, the lithium-loving sponge-like porous structure is constructed, the lithium deposition space is increased, the growth of lithium dendrites is effectively inhibited, the SEI layer is prevented from being punctured, and meanwhile, the artificial SEI layer with high stability, excellent ionic conductivity and mechanical strength is constructed by adopting the multifunctional inorganic composite material, so that the cycle performance, the safety and the overall efficiency of the lithium battery are improved.

The invention discloses an electrolyte and a lithium battery, which are used for solving the technical problem that the cycle life of the lithium battery is worsened due to the fact that the negative electrode of the existing lithium battery is easy to expand in the charging and discharging process. The electrolyte comprises a lithium salt, a solvent and an additive, and the additive comprises a compound as shown in a structural formula 1. In the design, by adding the compound as shown in the structural formula 1, a stable interfacial film can be formed on the surface of the negative electrode, the consumption of electrolyte is inhibited, and meanwhile, the negative electrode has the effects of removing water and acid, reducing side reaction of an interface, effectively improving cycle thickness expansion and prolonging the cycle life of the lithium battery.

The application relates to the technical field of battery materials. Disclosed are a lithium nickel-manganese acid positive electrode material, a preparation method thereof, a positive electrode and a battery. The lithium nickel-manganese acid positive electrode material comprises a base material and a first coating layer and a second coating layer successively coated on the surface of the base material; the chemical general formula of the base material is Li(Li a Ni b Mn c Fe d Sb e )O 4‑x , wherein a+b+c+d+e=2, 0<=x<=0.2, 0<=a<=0.1, 0.4<=b<=0.5, 1<=c<=1.5, 0.1<=d+e<=0.4; the first coating layer comprises NbTi(PO4)3, and the mass ratio of the first coating layer to the base material is 0.1-5:100; the second coating layer comprises a carbon material, and the mass ratio of the second coating layer to the base material is 0.1-5:100. The lithium nickel-manganese acid positive electrode material provided by the embodiment of the application has excellent electrochemical performance.

The invention provides a pre-lithiated silicon oxide composite material as well as a preparation method and application thereof, belongs to the technical field of lithium ion batteries, and is used for solving the technical problems of poor initial coulombic efficiency and stability of pre-lithiated silicon monoxide. The preparation method comprises the following steps: carrying out disproportionation reaction on silicon oxide at high temperature; and cooling to a relatively low temperature, introducing inert gas and carbon source mixed gas, and carrying out carbon coating through a chemical vapor deposition technology to form the SiOx / Si-C composite material. And mixing the treated silicon oxide with a lithium supplement agent, heating in an inert gas environment to pre-lithium, and washing and drying the product to prepare the high-performance silicon-oxygen composite material. According to the invention, the initial coulombic efficiency of the lithium ion battery is remarkably improved, and a more stable carbon-coated structure is formed, so that the capacity retention ratio and the cycling stability of the battery are enhanced. In addition, the technology has lower preparation cost, and is suitable for wide application in the battery manufacturing industry.

The invention provides an electrolyte, a secondary battery and a device. The electrolyte comprises a lithium salt, a solvent and an additive, wherein the additive comprises an unsaturated cyclic carbonate additive and a sulfonate additive; the unsaturated cyclic carbonate additive comprises at least one of compounds shown in a formula I, the sulfonate additive comprises at least one of compounds shown in a formula II-A and a formula II-B, the mass percentage content of the unsaturated cyclic carbonate additive is P1% based on the total mass of the electrolyte, and P1 is larger than or equal to 0.01 and smaller than or equal to 10. According to the electrolyte, a layer of special CEI interface film can be formed on the surface of the positive electrode active material, so that the electrochemical performance of the positive electrode active material is improved.

The invention provides a single crystal-polycrystal composite positive electrode material and a preparation method thereof, a solid-state battery positive electrode layer and a solid-state battery, the single crystal-polycrystal composite positive electrode material comprises a single crystal positive electrode material, a polycrystal positive electrode material and a solid electrolyte material, the particle size D50 of the polycrystalline positive electrode material is larger than the particle size D50 of the single crystal positive electrode material and is larger than the particle size D50 of the solid electrolyte material; the mass ratio of the polycrystal positive electrode material to the single crystal positive electrode material is less than or equal to 1. According to the invention, through three-level grain composition and control of the mass ratio of the single-crystal positive electrode material to the polycrystalline positive electrode material, the single-crystal particles construct a rigid framework, and the polycrystalline particles and the electrolyte fill gaps, so that the contact area of the active material and the electrolyte is increased, the stack pressure is reduced, and the compaction density is improved; and meanwhile, the problems of poor interface stability, poor rate capability and high cost are solved.

The invention provides a high-safety high-voltage halogenated ether-phosphate cosolvent electrolyte and a lithium battery. The electrolyte is composed of a lithium salt, a non-aqueous organic solvent and an additive, the lithium battery is obtained by assembling a positive plate, a negative plate, a diaphragm and the electrolyte. The prepared electrolyte can form a compact and stable interface passivation film on the surfaces of the positive electrode and the negative electrode of the lithium battery, oxygenolysis of the electrolyte is effectively inhibited, and interface side reaction is reduced, so that the electrochemical window and the safety of the battery are improved, and the cycle life of the battery at normal temperature and high temperature is prolonged.

The utility model relates to an insulating film structure, a battery and an electric device. An insulating film structure is used for coating a battery cell, the battery cell comprises a plurality of stacked roll cores, and the insulating film structure comprises an insulating film base body, a plurality of insulating layers and a plurality of insulating layers, flame retardant is arranged in the bag bodies, and the bag bodies are arranged on the side, used for being in contact with the battery cell, of the insulating film base body. The bag body is accommodated in the insulating film, when the battery cell is impacted, the bag body is broken, or when the battery cell is abnormally high in temperature, the bag body melts, and the flame retardant can be released into the battery cell, so that the conductivity of the battery is reduced, and short circuit and delay of the battery or thermal runaway of the battery are avoided.

This invention discloses a multi-level carbon-coated ternary composite material and its preparation method, comprising the following steps: S1: Nanoscale wet grinding of single-crystal NCM and expanded graphite, allowing NCM to be inserted between the expanded graphite layers, followed by drying to obtain mixture 1; S2: Mixing mixture 1 from S1 with medium-temperature pitch to obtain mixture 2; S3: Low-temperature sintering of mixture 2 obtained in S2, followed by crushing to obtain the multi-level carbon-coated ternary composite material. This invention embeds single-crystal NCM into the expanded graphite layers through grinding, improving the electronic conductivity of NCM and enhancing rate performance. The expanded graphite adapts to the volume expansion of single-crystal NCM during charge and discharge, maintaining close contact between materials, thereby improving cycle life. The secondary coating of the material with low-softening-point medium-temperature pitch further reduces the contact area between single-crystal NCM and the electrolyte, improving cycle stability. The medium-temperature pitch can complete carbonization at a lower temperature, avoiding the collapse of the NCM structure during high-temperature carbonization.

The invention discloses a polyurea-based gel polymer electrolyte, a synthesis method thereof and application of the polyurea-based gel polymer electrolyte in a lithium battery, and belongs to the technical field of lithium batteries. A mixture containing a polyureido polyalkenyl monomer, an electrolyte and an initiator is subjected to thermal initiation polymerization reaction to obtain the polyureido gel polymer electrolyte, and the polyureido gel polymer electrolyte integrates ureido functional groups, flame-retardant structural units and coordination polar groups and has a covalent cross-linked network and a dynamic hydrogen bond network at the same time. The composite material shows excellent mechanical properties and ion transmission capability, has intrinsic flame-retardant characteristics, and is especially suitable for preparing high-safety gel-state lithium metal batteries, lithium ion batteries and other electrochemical devices.

The invention provides a composite positive electrode material, a preparation method thereof and an all-solid-state lithium battery containing the composite positive electrode material. The composite positive electrode material comprises positive electrode active material particles, sulfide solid electrolyte particles and a lithium fluoride layer, the lithium fluoride layer is located between the positive electrode active material particles and the sulfide solid electrolyte particles. The composite positive electrode material is prepared by carrying out a calcination reaction on a fluorine-containing compound and a positive electrode active material and / or sulfide solid electrolyte. The composite positive electrode material provided by the invention has the lithium fluoride layer, so that the interface contact reaction of the positive electrode active material and the sulfide solid electrolyte can be inhibited while the interface area of the positive electrode active material and the sulfide solid electrolyte is increased, and the residual alkaline lithium compound in the positive electrode active material can be consumed when the lithium fluoride layer is formed; therefore, the all-solid-state lithium battery adopting the composite positive electrode material has good cycling stability and rate capability.

The application discloses an organic-inorganic composite structure for storing metal lithium and a preparation method and application thereof, relates to the technical field of battery materials, and comprises an organic film containing a polymerized ionic liquid and a three-dimensional inorganic frame structure, wherein the organic film is formed by compounding a polymerized ionic liquid, a lithium salt and an organic polymer; the polymerized ionic liquid is formed by photo-polymerization or thermal polymerization of an ionic liquid monomer composed of an imidazole ring cation containing a polymerizable functional group with a carbon-carbon double bond or a triple bond and a functional anion; and the mass ratio of the precursor monomer of the polymerized ionic liquid to the organic polymer is 1:1-1:10. The organic-inorganic composite structure for storing metal lithium and the preparation method and application thereof can provide deposition storage space for metal lithium, effectively inhibit lithium dendrite growth and volume expansion, and improve the internal structure stability and safety in the battery cycle process.

The invention relates to the field of lithium iron phosphate, in particular to a composite solid electrolyte synergistically modified lithium iron phosphate positive electrode material and a preparation method thereof. The preparation method is used for solving the problems that existing lithium iron phosphate is poor in electronic conductivity, high in interface impedance and poor and low in interface stability. The lithium iron phosphate positive electrode material synergistically modified by the composite solid electrolyte comprises COF / neodymium-doped lithium titanium aluminum phosphate modified lithium iron phosphate, acetylene carbon black, polyethylene glycol and N-methyl pyrrolidone, according to the preparation method, firstly, lithium iron phosphate is prepared, neodymium ions are doped in the process of preparing lithium titanium aluminum phosphate to serve as a first modification layer, cyanophenothiazine COF is synthesized to serve as a second modification layer, two layers of solid electrolyte are modified on the surface of the lithium iron phosphate to achieve a synergistic effect to form a protective film, and formation of lithium dendrites can be effectively reduced; the interface stability and the cycle performance of the material are remarkably improved, and the safety of the battery is enhanced.

The application discloses a negative-electrode-free sodium battery diaphragm, a preparation method and application thereof, and relates to the technical field of negative-electrode-free sodium batteries. The application forms a sandwich structure by using a positive electrode side polymer layer, a heat conduction layer and a negative electrode side polymer layer, introduces polyolefin elastomer POE into the negative electrode side polymer layer, enhances the elasticity of the diaphragm, buffers the expansion and contraction of the negative electrode side in the charging and discharging process, guarantees the close adhesion of the interface, the heat conduction layer quickly conducts heat, reduces the interface side reaction caused by the heat accumulation, avoids the loss of elasticity of the elastic layer due to high temperature aging, and the positive electrode side polymer support layer guarantees the overall mechanical strength, avoids the deformation of the diaphragm in the cycle process, and prevents the short circuit condition. The sandwich structure can effectively solve the core problems of the interface buffer adhesion and the low heat dissipation efficiency of the negative-electrode-free battery, provide sufficient mechanical strength to prevent the deformation of the diaphragm and the short circuit of the battery, and can simultaneously improve the expansion buffer effect, the heat dissipation capacity, the electrochemical performance and the gas production inhibition effect.

The invention relates to a full-carboxyl biomass gel electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing Tempo oxidized nano-cellulose dispersion liquid with sodium alginate, pouring the mixture into a mold, immersing the mold into a divalent zinc salt solution, and standing to obtain the nano-cellulose / sodium alginate gel electrolyte. According to the invention, Tempo oxidized nano-crystalline cellulose dispersion liquid and sodium alginate are mixed, and the gel electrolyte with a dual-network structure is constructed through hydrogen-bond interaction between the Tempo oxidized nano-crystalline cellulose dispersion liquid and sodium alginate and rapid metal coordination between sodium alginate and zinc ions and is used for the zinc ion battery. The stable three-dimensional network structure and rich polar carboxyl functional groups of the gel electrolyte can accelerate the transmission rate of zinc ions and adjust interface zinc ion deposition, so that the effects of inhibiting zinc dendrites and reducing interface side reactions are achieved. The method is simple, the raw materials are easy to obtain, the repetition rate is high, and the prepared gel electrolyte has high ionic conductivity and good mechanical performance.

The application discloses a kind of solid electrolyte and preparation method thereof, solid-state battery, solid electrolyte is made of polymer, and lithium salt and additive dispersed in polymer, additive includes inorganic nano-particle, plasticizer and ionic liquid, polymer is one of polyvinyl ether of formula P1 to formula P7, the number average molecular weight of polymer is 1×10 4 -10×10 4 ;Wherein, m is positive integer, Cy is cyclohexyl, i Bu is isobutyl, n Bu is n-butyl, Bn is benzyl.The polyvinyl ether used in the application is a stereoregular polymer, the main chain and side chain do not contain active hydrogen chemical groups (such as hydroxyl), which can significantly reduce the tendency of electrolyte oxidation and decomposition under high pressure, and significantly improve the electrochemical window.The electrochemical window of the solid-state battery of the application is increased to 4.8V or more.

The application discloses a sodium ion battery positive electrode material and a preparation method thereof. By adding cheap, non-toxic, environment-friendly and easily-degradable water-soluble cellulose as an additive, the growth of a specific crystal direction can be inhibited. The hydrophilic group of the water-soluble cellulose can change the coordination environment of metal ions and reduce the entry of water molecules into the crystal lattice. In addition, by introducing the water-soluble cellulose, high-concentration reactant feeding can be realized, which is beneficial to reducing the consumption of industrial water. Meanwhile, compared with other existing additives, the water-soluble cellulose is environment-friendly, easily-degradable, low in production and separation cost, and free of toxic by-product generation. The prepared open three-face cubic Fe-based Prussian blue analogue material is good in dispersity, high in purity and uniform in morphology, and as a sodium ion battery positive electrode material, has a reversible capacity of 155.40 mAhg ‑1 at 0.1C (1C=170 mAhg ‑1 ) and a first discharge coulombic efficiency of 97.83%.

The application provides a battery electrolyte, comprising an additive component, the additive component comprising a nitrogen-containing heteroatom bridged ring structure, fluorine-containing acid root ions and / or fluorine-containing imine negative ions. The application modifies the electrolyte by selecting a specific additive component to form a stable and firm CEI film on the positive electrode surface to protect the electrode structure, and introduces fluorinated anions to enhance the association of anions and electrolyte solvent molecules, so as to improve the oxidation stability of the electrolyte. The modified electrolyte can be used to solve the instability of high-nickel ternary materials during the cycle process and the problem that the traditional electrolyte is prone to oxidative decomposition at high voltage, so as to improve the cycle life and rate performance of the ternary lithium battery at high voltage. The application is helpful to improve the oxidation stability of the electrolyte, reduce the charge transfer impedance and interface impedance, improve the ion diffusion rate, and enhance the stability of the electrode material structure.

The application discloses a vanadium pentoxide-based magnesium battery positive electrode material and a preparation method thereof. The application obtains flower-spherical vanadium pentoxide through a hydrothermal reaction of an ammonium metavanadate and a mixed solution of reactants and subsequent calcination; the method has high production efficiency, is convenient to produce, has short preparation time, is low in cost and has good repeatability. The flower-spherical vanadium pentoxide nanomaterial is used as a magnesium battery positive electrode material, more surface active sites can be exposed, ion transmission channels are increased, the problem of stacking and agglomeration of vanadium pentoxide nanosheets in a cycle process is solved, the exposed (001) crystal face reduces the interface side reaction of an electrode and an electrolyte surface, the storage capacity of vanadium pentoxide is greatly improved, the vanadium pentoxide has good cycle stability and is an excellent magnesium battery positive electrode material.

The invention discloses a Prussian blue electrode material, a potassium ion battery and a preparation method thereof.The preparation method comprises the steps that transition metal salt is dissolved in a solvent, a chelating agent and ascorbic acid are added, the mixture is violently stirred and dissolved, and a solution A is obtained; dissolving potassium ferrocyanide and potassium citrate in deionized water to obtain a solution B; slowly dropwise adding the solution A into the solution B under the conditions of normal temperature and continuous stirring for co-precipitation reaction, shading, standing and aging a product, centrifuging, washing and drying in vacuum to obtain a Prussian blue positive electrode material, uniformly mixing the Prussian blue positive electrode material with conductive black and a binder in proportion, grinding into slurry, coating a carbon-coated aluminum foil with the slurry to obtain a positive electrode plate, taking a potassium plate with the diameter phi of 14mm as a negative electrode, and taking a negative electrode plate with the diameter phi of 14mm as a negative electrode; 0.5%-5% of an additive is added into the organic electrolyte, and the potassium ion battery is assembled under the protection of filled argon. By adding the additive, the interface side reaction is effectively reduced, a relatively stable crystal structure is maintained, the cycling stability of the material is improved, and the electrochemical performance of the potassium ion battery is effectively improved.

The present application belongs to the technical field of lithium ion battery cathode material precursor, and particularly relates to a kind of tricobalt tetroxide and its preparation method and application, the preparation method includes the following steps: (1) solution containing carbonate ion and ammonium ion is used as bottom liquid, and is added into cobalt metal liquid, magnesium and / or aluminum containing cation doping liquid, precipitant solution and complexing agent solution to carry out nucleation reaction, the pH of reaction is adjusted to 7.8-8.2, and seed slurry is obtained after reaction;(2) the slurry obtained in step (1) is used as bottom liquid, and the cobalt metal liquid, phosphate ester doping liquid and the precipitant solution are added into to carry out shell forming reaction, and the pH of reaction is adjusted to 6.8-7.1, to obtain cobalt carbonate slurry;(3) after solid-liquid separation of the cobalt carbonate slurry, the solid phase is taken and calcined to obtain.

The application discloses an electrolyte applied to a lithium ion battery or a sodium ion battery, the electrolyte comprising a main salt, an organic solvent, and a first additive and a second additive, the first additive being a propargyl sulfonate compound with a structure shown in the following formula (A): the second additive being lithium difluorophosphate fluorophosphate with a structure shown in the following formula (B), lithium difluorophosphate fluorophosphate or sodium difluorophosphate fluorophosphate with a structure shown in the following formula (C); the definitions of the substituents in the formulas (A), (B) and (C) are shown in the specification; the first additive accounts for 0.1-3.0 wt% of the total mass of the electrolyte; and the second additive accounts for 0.1-5.0 wt% of the total mass of the electrolyte. The electrolyte disclosed by the application is beneficial to improving the high-temperature cycle stability and storage stability of the lithium ion battery or the sodium ion battery on the basis of taking into account the high-temperature and low-temperature performances.

This invention discloses a long-lasting, cyclic hydrogel-modified electrolyte and its preparation method, belonging to the field of aqueous zinc-ion battery technology. The electrolyte comprises a base electrolyte, additives, a crosslinking agent, and an initiator. The base electrolyte is prepared by mixing zinc salt, acrylamide, and a solvent to form a mixed solution, wherein the solvent is deionized water, and the concentration of zinc salt in the base electrolyte solution is 1-3 M. The additive is asiaticoside, with a concentration of asiaticoside in the electrolyte solution of 5-15 mM, a preferred concentration of 10 mM, and a molar ratio of asiaticoside to zinc salt of 66.7-600:1. The zinc salt is one or more of zinc sulfate, zinc chloride, zinc nitrate, zinc acetate, and zinc trifluoromethanesulfonate. This invention introduces asiaticoside as a functional additive into the electrolyte to construct a composite hydrogel electrolyte, effectively optimizing ion transport behavior, solving the problem of insufficient interfacial compatibility, and significantly improving the long-term cycle life and electrochemical stability of the battery.

This application discloses a secondary battery and an electrical device, belonging to the field of battery technology. By controlling the mass ratio of the first lithium supplementer and the second lithium supplementer, the mass ratio of cyclic carbonate to chain carbonate in the electrolyte, the mass percentage of sulfur-containing additives in the electrolyte, and the thickness of the ceramic layer in the separator to satisfy: 0.17≤W≤11.18, this application significantly improves the gas generation problem of the secondary battery, effectively improves the cycle life of the secondary battery, and reduces the DCR.

The invention discloses a zinc ion battery and a low-concentration hybrid electrolyte for electrochromism. The low-concentration hybrid electrolyte is composed of zinc trifluoromethanesulfonate, an organic solvent and deionized water. The side reaction of an electrode / electrolyte interface can be reduced, and the electrochemical performance of the device is improved. The preparation method of the low-concentration hybrid electrolyte for the zinc ion battery and the electrochromism comprises the following steps: step 1, at room temperature, weighing a solution according to a volume ratio of an organic solvent to deionized water of (9-1): 1, and uniformly mixing; 2, zinc trifluoromethanesulfonate is weighed and added into the mixed solution obtained in the step 1 to be vibrated and dissolved, the concentration of the zinc trifluoromethanesulfonate in the mixed solution ranges from 0.1 mol / L to 1.5 mol / L, and the L is metered only by the mixed solution of the organic solvent and the deionized water.

The application provides an NCM positive electrode material modified by a halide electrolyte and a preparation method, application and solid-state battery and power utilization device thereof, and relates to the technical field of solid-state batteries. A halide electrolyte layer is coated on the surface of the NCM positive electrode material. The halide electrolyte comprises Li3InCl6. The Li3InCl6 not only has excellent lithium ion transmission capacity, but also has good interface compatibility with the NCM positive electrode material, so that the interface stability of the positive electrode material and the electrolyte can be improved. The problem of poor compatibility of sulfide electrolyte with the positive electrode material, especially the problem of insufficient interface stability when in contact with a high-voltage positive electrode, is solved.

The application provides a lithium ion battery, which comprises a positive electrode sheet and an electrolyte; the positive electrode sheet comprises a positive electrode active material lithium iron phosphate; the electrolyte comprises an additive a and an additive b; the additive a comprises vinylene carbonate; and the additive b comprises a compound with a structure shown in formula (I) and a compound with a structure shown in formula (II). The two additives are used in combination, partially replace VC, reduce the addition amount of VC, and compared with the SEI formed by the reduction of VC, the SEI structure formed by the compound with the structure shown in formula (I) and the compound with the structure shown in formula (II) is more compact, the inhibition effect of the interface side reaction is stronger, and the effect of improving high-temperature cycle is better compared with VC.