3362 results about "Lithium metal" patented technology

Embodiments described herein relate generally to electrochemical cells having pre-lithiated semi-solid electrodes, and particularly to semi-solid electrodes that are pre-lithiated during the mixing of the semi-solid electrode slurry such that a solid-electrolyte interface (SEI) layer is formed in the semi-solid electrode before the electrochemical cell formation. In some embodiments, a semi-solid electrode includes about 20% to about 90% by volume of an active material, about 0% to about 25% by volume of a conductive material, about 10% to about 70% by volume of a liquid electrolyte, and lithium (as lithium metal, a lithium-containing material, and / or a lithium metal equivalent) in an amount sufficient to substantially pre-lithiate the active material. The lithium metal is configured to form a solid-electrolyte interface (SEI) layer on a surface of the active material before an initial charging cycle of an electrochemical cell that includes the semi-solid electrode.

The invention discloses a pre-lithiated silicon-carbon negative electrode material as well as a preparation method and application thereof. The pre-lithiated silicon-carbon negative electrode material comprises composite particles and a surface coating layer coating the outer surfaces of the composite particles, the mass of the composite particles accounts for 85%-99% of the total mass of the pre-lithiated silicon-carbon negative electrode material; the composite particles are compounds of pre-lithiated porous carbon and nano silicon particles; the composite particles are obtained by uniformly depositing nano silicon particles in pores of pre-lithiated porous carbon; the mass of the pre-lithiated porous carbon accounts for 15-95% of the total mass of the composite particles; the pre-lithiated porous carbon comprises lithium metal particles and porous carbon, and the lithium metal particles are attached to the surfaces of pores of the porous carbon; the mass of the lithium metal particles accounts for 0.1-10% of the total mass of the pre-lithiated silicon-carbon negative electrode material; when the pre-lithiated silicon-carbon negative electrode material is applied to the lithium battery, the first-circle coulombic efficiency of the lithium battery can be improved.

The invention belongs to the technical field of batteries, and discloses a negative pole piece and a preparation method thereof, a non-negative lithium battery and a lithium battery. The negative pole piece comprises a current collector and a lithium-loving active layer, the lithium-loving active layer is arranged on at least one side of the current collector, the lithium-loving active layer comprises nanowires and conductive particles dispersed on the nanowires, and when lithium metal is deposited, the nanowires provide nucleation sites for the lithium metal. According to the negative pole piece provided by the invention, the coulombic efficiency and the cycling stability of the negative-electrode-free lithium battery can be improved.

A negative electrode-free lithium metal battery, and a preparation method therefor and a use thereof. The negative electrode-free lithium metal battery comprises: a positive electrode, comprising a positive electrode current collector and a positive electrode active material layer containing a lithium supplementing additive; a negative electrode current collector; an electrolyte, comprising at least one boron-containing lithium salt and a fluorinated amide compound solvent; and a separator. The fluorinated amide electrolyte and the lithium supplementing additive are used in combination, so that a thin lithium layer having a dense deposition structure can be formed in situ on the negative electrode current collector when the negative electrode-free lithium metal battery is charged for the first time, and is taken as additional stored lithium to make up for irreversible lithium loss, thereby remarkably prolonging the cycle life of the negative electrode-free lithium metal battery while keeping high energy density.

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

The invention discloses a phosphonic acid-based metal organic framework solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolyte materials. The method comprises the following steps: mixing a metal salt, an organic phosphonic acid ligand and an organic solvent, carrying out a coordination reaction, and treating to obtain MOF powder; heating and activating the MOF powder to obtain activated MOF powder; the method comprises the following steps: mechanically grinding lithium salt and MOF powder to form a mixture, heating to enable the molten lithium salt to permeate and fill MOF channels, and cooling to obtain solid electrolyte powder. The ionic conductivity of the solid electrolyte at 30 DEG C reaches 1.01 * 10 <-4 > S cm <-1 >, and the solid electrolyte is kept stable in a 4.4 V high-voltage window. The symmetrical battery based on the phosphonic acid-based MOF solid electrolyte can stably operate, and shows excellent compatibility and stability of the electrolyte and a lithium metal negative electrode. The method has the advantages of simple operation, cheap and easily available components, and is expected to be suitable for large-scale preparation.

The invention provides a double-layer polymer solid electrolyte, a preparation method thereof and a lithium ion battery, and belongs to the technical field of solid electrolyte manufacturing. The first polymer solid electrolyte layer comprises the following raw materials in parts by weight: 4-30 parts of a first reactive monomer A, 5-25 parts of a first reactive monomer B, a first cross-linking agent, a first photoinitiator, a first lithium salt, 1-20 parts of a first carbonic ester plasticizer and 20-45 parts of a nitrile plasticizer; the second polymer solid electrolyte layer comprises the following raw materials in parts by weight: 4-30 parts of a second reactive monomer A, 5-25 parts of a second reactive monomer B, a second cross-linking agent, a second photoinitiator, a second lithium salt, 1-35 parts of a second carbonic ester plasticizer and 10-35 parts of a fluorine-containing plasticizer; the double-layer polymer solid electrolyte has the advantages of relatively high ionic conductivity and compatibility of a high-voltage battery positive electrode and a low-voltage lithium metal negative electrode, so that the corresponding battery has relatively excellent cycle performance and relatively high capacity.

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

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

The invention relates to the technical field of all-solid-state lithium metal batteries, in particular to a cellulose paper-based polymer solid electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing N-methylacetamide and lithium bis (trifluoromethanesulfonyl) imide to obtain a eutectic solvent; the preparation method comprises the following steps: mixing a eutectic solvent, polyethylene glycol oxalate, acrylamide and a thermal initiator to obtain a eutectic polymer electrolyte precursor; and soaking cellulose paper in the eutectic polymer electrolyte precursor, and carrying out hot-pressing polymerization to obtain the cellulose paper-based polymer solid electrolyte. The cellulose paper-based polymer solid electrolyte prepared by the invention is soft in texture and can be better attached to an electrode, the problem of poor contact between the electrode and an electrolyte interface is solved, and the interface impedance is reduced by fusing the characteristics of low viscosity and high conductivity of the eutectic solvent and the supporting effect of the cellulose paper; the ion transmission efficiency is improved, and conditions are provided for long-term stable circulation of the battery.

The invention relates to an integrated carbonaceous honeycomb framework lithium metal composite negative electrode and a preparation method thereof, and belongs to the technical field of lithium metal batteries, the integrated carbonaceous honeycomb framework lithium metal composite negative electrode is formed by depositing lithium metal in an integrated carbonaceous honeycomb framework host, and the host is constructed by adopting metal salt-colloidal crystal microsphere template precursor preparation, compression molding and controllable carbonization processes. The structure has a highly ordered three-dimensional integrated macroporous skeleton, and can realize rapid transmission and uniform electric field distribution of lithium ions and electrons, so that dendrite-free homogeneous lithium deposition under ultrahigh capacity is realized, volume expansion is remarkably inhibited, and the reversible stability of lithium metal deposition / stripping is improved. The invention provides an efficient and stable negative electrode solution for a high-energy-density lithium battery, and has an important application prospect.

The invention discloses a composite solid electrolyte membrane, a solid lithium metal battery and a preparation method thereof, the composite solid electrolyte membrane comprises a fast ion conductor filler, a PVDF polymer matrix, a lithium salt and an amide additive, and the amide additive can perform weak coordination with lithium ions. According to the composite solid-state electrolyte membrane, the solid-state lithium metal battery and the preparation method of the solid-state lithium metal battery, disclosed by the invention, the room-temperature ionic conductivity of all-solid-state composite electrolyte can meet room-temperature operation of the battery, and the solid-state lithium metal battery is suitable for large-scale production and application.

The invention relates to an in-situ polymerized flame-retardant perfluorogel electrolyte, a lithium metal battery and a preparation method, the in-situ polymerized flame-retardant perfluorogel electrolyte is prepared from a fluorinated organic solvent, a lithium salt, a fluorine-containing polymer precursor and a thermal initiator, and the fluorine-containing polymer precursor further comprises a fluorine-containing polymer and a cross-linking agent. Compared with the prior art, the composite material has a high electrochemical window and excellent flame retardant property, and can realize matching with a high-voltage high-nickel positive electrode at room temperature and stable circulation of a high-voltage lithium metal battery; the preparation method is simple, the interface performance is optimized, and large-scale preparation is easy to realize.

The invention relates to the technical field of solid electrolyte, in particular to normal-temperature surface modified flexible oxide solid electrolyte and a preparation method and application thereof. The normal-temperature surface-modified flexible oxide solid electrolyte is prepared from the following raw materials: a monomer, polyethylene oxide, a solvent, an initiator, a modified oxide ceramic electrolyte and electrolyte salt, wherein the mass of the monomer is 1-10% of the total mass of the components; the molar ratio of the initiator to the monomer is 0.01%-0.1%; the molar ratio of the electrolyte salt to the monomer is 1: (6-12); the mass ratio of the electrolyte salt to the modified oxide ceramic electrolyte is 1: (2.5-5). The flexible oxide solid electrolyte has high conductivity, wide temperature tolerance range and high structural stability, and when the flexible oxide solid electrolyte is applied to an all-solid-state lithium metal battery, the ionic conductivity, safety and cycle performance of the battery are improved.

Systems, devices, and methods described herein relate to electrolyte formulations and the incorporation thereof into batteries. In some aspects, an electrolyte composition can comprise between about 10 wt % and about 42 wt % of an electrolyte solvent, between about 13 wt % and about 59 wt % of a fluoroether. In some embodiments, the electrolyte solvent can make up between about 26 wt % and about 39 wt % of the composition. In some embodiments, the fluoroether can make up between about 18 wt % and about 36 wt % of the composition. In some embodiments, the composition can include between about 0.5 wt % and about 1.5 wt % of a first additive. In some embodiments, the composition can include between about 0.5 wt % and about 5 wt % of a second additive.

Methods are proposed for manufacturing dendrite-resistant lithium metal electrodes suitable for incorporation into lithium metal batteries. In an embodiment, the method involves first electroplating a copper sheet onto a surface of a single crystal of silicon, the silicon being doped to form a p-type or an n-type semiconductor, and then further electroplating the copper sheet with lithium metal. The lithium-electroplated copper sheet thus manufactured provides a lithium electrode that is resistant to dendrite formation during cycling of lithium metal batteries when compared to conventionally manufactured lithium electrodes. Methods are further provided of manufacturing lithium sheets by directly electroplating lithium metal onto single crystals of doped silicon, the lithium sheets configured for incorporation into lithium metal electrodes that are resistant to dendrite formation during cycling of lithium metal batteries.

The lithium secondary battery is characterized in that the negative electrode is a lithium metal element or an alloy containing the same, and the lithium secondary battery uses an electrolyte solution for lithium secondary batteries containing an acrylic acid ester represented by general formula (1): # imgabs0 # formula (1) in which X is a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, or a CFX1X2 group (wherein X1 and X2 are the same or different and are hydrogen atoms, fluorine atoms, or chlorine atoms). ), a cyano group, a linear or branched fluoroalkyl group having 1-21 carbon atoms, a substituted or unsubstituted phenyl group, or a linear or branched alkyl group having 1-20 carbon atoms; y represents a directly linked bond, a C1-10 hydrocarbon group which may have an oxygen atom or a sulfur atom, or a-CH2CH2N (R1) SO2-group (wherein R1 represents a C1-4 alkyl group); ),-CH2CH (OY1) CH2-(In the formula, Y1 represents a hydrogen atom or an acetyl group. ), or-(CH2) nSO2-group (n is 1-10); and Rf is a linear or branched perfluoroalkyl group having 2 to 7 carbon atoms.

The invention discloses an anion-regulated weak-solvation sulfuryl electrolyte and a preparation method thereof, and belongs to the technical field of battery electrolytes. The electrolyte comprises a common lithium salt, a high-donor-number lithium salt and a sulfone solvent. The coordination of lithium ions and sulfone solvents is effectively weakened through anions of the lithium salt with the high donor number, and the interaction between the lithium ions and common lithium hydrochloride ions is enhanced. By constructing the weak solvation structure, the lithium ion desolvation process and the decomposition of common lithium salt are promoted, and meanwhile, the solid electrolyte interface SEI layer rich in inorganic matters is formed through the oxidation reduction of negative ions of the weak solvation structure, so that the problem of poor compatibility of a sulfone solvent with lithium metal and a graphite negative electrode is solved; meanwhile, good electrochemical performance and wide temperature range adaptability are achieved. The electrolyte has wide application prospects in the aspects of lithium ion batteries, energy storage lithium battery systems and the like.

The invention relates to the field of lithium metal batteries, and provides a lithium metal battery, a manufacturing method thereof and electric equipment, which are at least beneficial to improving the interface stability and safety of the lithium metal battery. The manufacturing method comprises the following steps: preparing an initial battery cell, injecting a first electrolyte into the initial battery cell, and then carrying out a first formation process, the first electrolyte comprising the following components: 8-23 wt% of a lithium salt, 0.01-5 wt% of carbon dots, 0.1-10 wt% of lithium nitrate and an ether solvent; a second formation process is carried out after a second electrolyte is injected into the initial battery cell, the second electrolyte comprises the following components: 8-23 wt% of a lithium salt, 5-40 wt% of a film-forming additive and an ionic liquid, and the ionic liquid comprises pyrrolidinium cations.

An electrolyte for a rechargeable lithium battery, according to embodiments of the present disclosure, comprises: a lithium salt; an organic solvent; and a fluorine-based additive of a specific chemical formula. The rechargeable lithium battery comprises: an electrode assembly which comprises a positive electrode comprising a lithium-transition metal oxide having a lithium molar ratio of 1.1 or more, and a negative electrode facing the positive electrode; and an electrolyte which is impregnated in the electrode assembly and comprises a fluorine-based additive of a specific chemical formula. Through the fluorine-based additive, electrolyte side reactions can be prevented, and the high-voltage charging stability and high-temperature lifespan characteristics of a positive electrode active material can be improved.

An anode-free lithium metal battery, a manufacturing method therefor and a use thereof. The anode-free lithium metal battery comprises: a cathode, the cathode comprising a cathode current collector and a cathode active material layer; an anode current collector, a lithium seed implantation layer being formed on the surface of the anode current collector corresponding to the cathode; an electrolyte; and a separator. By using the in-situ seed implantation technology, an ultra-thin lithium seed implantation layer is constructed in situ on an anode current collector before the first charging and discharging of a battery completing electrolyte injection and packaging, thereby solving the problem of non-uniform nucleation of metal lithium on the anode current collector, forming in situ, on the current collector after subsequent charging, a dense and uniform lithium deposition layer having strong bonding strength to the current collector, and significantly prolonging the cycle life while maintaining high energy density; and the use of a lithium supplementing additive and a fluorinated amide electrolyte realizes longer cycle life.

The invention discloses a sulfide-based composite solid-state electrolyte, a preparation method thereof and a lithium metal solid-state battery, sulfide is subjected to specific bifunctional surface grafting modification by using a silane coupling reagent with sulfydryl and epoxy bonds, then the sulfide is introduced into a polymer precursor liquid, and the sulfide-based composite solid-state electrolyte is prepared through light-heat curing reaction synergy. A flexible and rigid cross-linked network is formed, the sulfide-based composite solid-state electrolyte with high ionic conductivity and high mechanical strength is obtained, the interface stability of the sulfide-based composite solid-state electrolyte in the charge-discharge process is ensured, for example, the sulfide-based composite solid-state electrolyte in the embodiment 1 has high ionic conductivity (3.81 mS / cm), and the interface stability of the sulfide-based composite solid-state electrolyte in the embodiment 2 is ensured. The lithium-lithium symmetric battery prepared by the method has the advantages of excellent flexibility, high tensile strength (7.9 Mpa) and wide electrochemical window (5.1 V), the lithium-lithium symmetric battery can stably circulate for 2000h, and the whole battery can stably circulate for 2000 circles at the room temperature at the rate of 4C, so that the lithium-lithium symmetric battery has great industrial application value.

The invention relates to the technical field of lithium ion battery electrolyte additives, in particular to a porous lithium metal organic framework composite lithium supplement agent and a preparation method and application thereof. A porous lithium metal organic framework composite lithium supplementing agent comprises a lithium metal organic framework (Li-MOF), a three-dimensional porous structure is formed by Li and a biphenyldicarboxylic acid (BPDC) ligand through a coordinate bond, the pore diameter is 2-5 nm, and the specific surface area is larger than or equal to 500 m / g; the LiF nano-particles are loaded in the pore channels of the Li-MOF, the particle size is less than or equal to 5 nm, and the LiF nano-particles are uniformly distributed in the pore channels of the Li-MOF. According to the porous lithium metal organic framework composite lithium supplement agent and the preparation method thereof, the problems of an existing lithium supplement agent in the aspects of lithium supplement efficiency, interface stability, safety and the like can be effectively solved, and meanwhile the porous lithium metal organic framework composite lithium supplement agent has wide adaptability and remarkable commercial potential.

A lithium secondary battery according to the embodiments of the present disclosure comprises: a positive electrode comprising positive active material containing lithium metal oxide particles; a negative electrode facing the positive electrode; and a non-aqueous electrolyte solution comprising a non-aqueous organic solvent, lithium salt, and an additive containing a difluorophosphite-based compound, the molar ratio of lithium in the lithium metal oxide particles to the overall metal excluding the lithium in the lithium metal oxide particles is 1.05 or greater.

The invention discloses a deep eutectic-based polymer semi-solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid-state lithium metal batteries. The method comprises the following steps: mixing and melting lithium salt and succinonitrile to obtain a deep eutectic solution; dissolving a polymer monomer and a thermal initiator in the deep eutectic solution at normal temperature to obtain a precursor solution; the method comprises the following steps: soaking a lithium metal negative electrode in fluoroethylene carbonate, and airing to obtain a pretreated negative electrode; and assembling the battery according to the sequence of the negative electrode shell, the pretreated negative electrode, the cellulose membrane, the positive electrode and the positive electrode shell, and performing in-situ polymerization reaction in a heating state to obtain the lithium ion battery. The semi-solid electrolyte obtained through in-situ polymerization has relatively good interfacial compatibility with the lithium metal negative electrode, so that the battery performance is remarkably improved; the addition of a small amount of polyester containing a plurality of urea groups not only retains the high electrochemical performance of a liquid electrolyte, but also has the high safety of a solid electrolyte.

The invention discloses application of metal phthalocyanine in polymer solid electrolyte and an all-solid-state lithium / sodium battery. Metal phthalocyanine is adopted to prepare a PVDF-based polymer solid electrolyte, and then the PVDF-based polymer solid electrolyte is used as a positive electrode component to be used in a polymer all-solid-state sodium battery, or metal phthalocyanine is adopted to prepare a PEO-based polymer solid electrolyte, and then the PEO-based polymer solid electrolyte is used as a negative electrode component to be used in an all-solid-state lithium battery. And the preparation of the high-performance polymer all-solid-state lithium / sodium battery at room temperature can be realized. A metal phthalocyanine network with a plane pi-conjugated structure is introduced into a PVDF or PEO matrix, metal in metal phthalocyanine is Zn, Co or Fe, preparation of the all-solid-state sodium / lithium metal battery is achieved, and the prepared all-solid-state sodium / lithium metal battery has high cycling stability.

The invention discloses an oxyhalide solid electrolyte, a preparation method thereof and an all-solid-state battery, and relates to the technical field of batteries. The solid electrolyte is LiaMbNcXdOe, M and N are the same elements or different elements, and M and N are at least one of Zn, Ba, Al, In, Y, Cr, Ti, Zr, Hf, Nb, Ta, La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; x is at least one of F, Cl, Br and I. The oxyhalide solid electrolyte with high ionic conductivity and cost advantage is prepared by selecting high-valence metal oxide, halide and lithium halide through a ball milling method and combining annealing and hot pressing processes, and the oxyhalide solid electrolyte can show good electrochemical performance when being applied to all-solid-state lithium metal batteries.

The present invention relates to a high-voltage lithium metal battery, characterized by its non-flammability due to the high flash point and high thermal stability of its specifically designed electrolyte, thereby ensuring its safe operation. In particular, the battery comprises an electrolyte with lithium salts and a novel diether compound with asymmetrical fluorination, developed based on electrolyte molecular design, synthesis and thermophysical properties characterization. The electrolyte with the asymmetrically fluorinated diether compound exhibits high thermal stability through high boiling point and high flash point, while also having a high working voltage, allowing high energy density designs and simultaneously optimizing operation safety by minimizing flammability and flash risks.

The invention provides an electrolyte and a lithium battery containing the same. The electrolyte comprises a lithium salt, a solvent and an inducer, the solvent comprises one or more of siloxane compounds as shown in a formula I; the inducer is selected from one or more of C1-C5 halogenated alkanes, C1-C5 halogenated cycloalkanes, C2-C6 halogenated aliphatic ethers and C6-C12 halogenated aromatic compounds. The electrolyte provided by the invention utilizes the intermolecular interaction force between the siloxane compound and the inducer, so that the dissolution of the lithium salt in the solvent is realized, and the electrolyte has high compatibility to a lithium metal negative electrode, has a wide electrochemical window, can be well matched with a high-voltage positive electrode material and a lithium metal negative electrode material, and has a good application prospect. And the cycle life and coulombic efficiency of the battery can be improved.

The invention discloses a mixed ion conductor layer for a lithium metal negative electrode, a preparation method of the mixed ion conductor layer and an all-solid-state battery, and belongs to the technical field of sulfide all-solid-state batteries. The preparation method comprises the following steps: synthesizing a sulfide electrolyte 70 (0.75 Li2S-0.25 P2S5)-30LiI through a liquid phase, introducing graphene oxide and a lithium salt precursor 2, 5-dihydroxy-1, 4-benzene diphosphate in the electrolyte preparation process, and carrying out heat treatment and pressing to obtain a mixed ion conductor layer; the graphene oxide can isolate the sulfide electrolyte layer from the lithium metal negative electrode, interface reaction is avoided, and a special porous and interlayer structure provides a transverse growth space for lithium metal deposition. And meanwhile, the lithium diphosphate-based MOF among the graphene layers ensures the rapid movement of lithium ions, enhances the bulk diffusion of lithium at the negative electrode end, reduces the local current density, plays a role in dredging the distribution of the lithium ions, and remarkably prolongs the cycle life of the sulfide all-solid-state battery.