271results about How to "Improve Interface Stability" patented technology

The invention belongs to the technical field of perovskite solar cells, and particularly discloses a self-assembly monomolecular film hole transport material based on diphosphoric acid and a preparation method and application thereof.The diphosphoric acid serves as an anchoring group, the chelation between the material and a conductive base can be effectively enhanced, the self-assembly characteristic of the material on the surface of a substrate is improved, and the hole transport efficiency is improved. The compact and smooth self-assembled monomolecular film is formed. Meanwhile, the electron and space effects of alkyl chains or benzene ring connecting units are regulated and controlled, so that the molecular stereo configuration and energy level matching are optimized. The material disclosed by the invention is simple in synthesis steps and low in preparation cost, and industrial synthesis of the material can be realized. When the material is applied to an inverted perovskite solar cell as a hole transport layer, photoelectric conversion efficiency exceeding 24.7% and excellent device stability performance can be obtained, and huge commercial prospects are shown.

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 provides a high-performance all-solid-state sodium ion battery, and belongs to the technical field of power batteries, the sodium ion battery comprises a Prussian white positive electrode, a metal sodium negative electrode and an NASICON type solid electrolyte; preparation raw materials of the Prussian white positive electrode comprise Prussian white, the general formula of the Prussian white is NaxFe [Fe (CN) 6], and x is larger than or equal to 1.8 and smaller than 2.2; the composition of the NASICON type solid electrolyte is NaxZr2-yMySiuPvO12, x is more than 0 and less than or equal to 4, y is more than or equal to 0 and less than 2, u is more than 0 and v is less than 3; in the NaxZr2-yMySiuPvO12, M is at least one of a Zn element, a Mg element, a Cu element, an Al element, a Ni element, a Ga element, a Fe element and a K element. The sodium ion battery has excellent electrochemical performance at room temperature, is high in safety, and is beneficial to commercialized development and application of all-solid-state sodium ion batteries. The invention also provides a preparation method of the high-performance all-solid-state sodium ion battery.

The invention relates to a polymer-based composite solid electrolyte, a preparation method and a sodium solid-state battery, and belongs to the technical field of solid-state batteries. The polymer-based composite solid electrolyte is prepared from the following components in parts by mass: 8 to 12 parts of alkene polymer, 4 to 8 parts of sodium salt and 1 to 8 parts of filler, and the filler is nitrided nano TiO2. The polymer-based composite solid electrolyte can be prepared in a simple and efficient mode, the ionic conductivity is high, the electrochemical stability window is wide, the ionic conductivity reaches 0.3-1.2 mS / cm, and the electrochemical stability window reaches 4.3-5.5 V; and meanwhile, the formation of good SEI can be promoted in the sodium solid-state battery, and the interface stability between the electrolyte and the electrode is improved.

The invention relates to a low-temperature graphite negative electrode material and a preparation method thereof, and belongs to the technical field of high polymer materials. According to the prepared low-temperature graphite negative electrode material, firstly, the surface of graphite is pre-oxidized through potassium persulfate, phosphorus pentoxide and concentrated sulfuric acid, and then under the action of sodium nitrate, potassium permanganate and hydrogen peroxide, graphite oxide is prepared; then, ammonium molybdate hydrate and thioacetamide are used as a molybdenum source and a sulfur source, graphite oxide is used as a supporting material, a molybdenum disulfide-graphite compound is synthesized, and the conductivity and the cycling stability are improved; secondly, the surface of the negative electrode is coated with amorphous resin carbon / nickel oxide, so that the ion diffusion efficiency of the low-temperature graphite negative electrode material is enhanced, and the electrochemical lithium storage performance is improved in a low-temperature environment; and finally, the surface of the amorphous resin carbon / nickel oxide is coated with a layer of polythiophene film, so that the rate capability of the negative electrode material is improved due to large surface area and high pores.

The invention relates to the technical field of lithium batteries, in particular to a binder composition and application thereof, a negative electrode material, a negative electrode plate and a lithium ion battery. The binder composition comprises the following components in parts by weight: 100 parts of a binder; 0.1 to 10 parts of conductor polymer; 0-20 parts of a functional polymer; the conductor polymer is selected from one or more of imine covalent organic framework polymers; the functional polymer is selected from one or more of polymers capable of forming dynamic hydrogen bonds with the binder and / or the conductor polymer. The binder composition is used for the silicon-based lithium ion battery, can maintain the complete structures of the negative electrode of the lithium ion battery and an SEI membrane, and can improve the electrochemical performance of the lithium ion battery.

The invention belongs to the technical field of lithium ion batteries, and discloses a polycarbonate copolymer solid electrolyte with a sulfur-containing main chain and a preparation method thereof. The polycarbonate copolymer with the sulfur-containing main chain is obtained by catalyzing polymerization of carbon dioxide, epoxide and episulfide by using a cheap, easily available, simple and efficient nonmetal Lewis acid and an organic amine / organic ammonium salt / organic phosphorus bi-component catalytic system, and the copolymer has excellent mechanical properties, thermal stability and chemical stability. Uniformly mixing the copolymer, a lithium salt and a plasticizer in a solvent to obtain an electrolyte solution; and preparing a membrane from the electrolyte solution on a porous support material, and carrying out vacuum drying to obtain the solid electrolyte. The room-temperature ionic conductivity of the solid electrolyte is 3.4 * 10 <-7 >-7.2 * 10 <-4 > S / cm, and the solid electrolyte has an electrochemical oxidation window of 4.5 V-5. 5V. The solid electrolyte shows excellent cycle performance and interface stability when being used for the lithium ion battery, and can effectively inhibit the growth of negative electrode lithium dendrites.

The invention relates to the technical field of capacitor electrolyte manufacturing, in particular to an ultrahigh-conductivity capacitor electrolyte formula and a preparation method thereof.The ultrahigh-conductivity capacitor electrolyte formula comprises a main solvent, a solute and an additive, an organic solvent in the main solvent and a low-viscosity organic solvent are mixed according to a specific proportion, the dielectric property and the ion migration environment of the solvent can be effectively balanced, and the conductivity of the capacitor is improved; and a good condition is created for ion transmission. And through reasonable matching and concentration control of high-dissociation-degree salts and organic salts in solutes, sufficient dissociation and efficient transmission of ions are ensured, and the conductivity of the electrolyte is greatly improved. A plurality of additives are added according to a specific proportion and properties, the conductivity enhancing additive forms a conductive network, the electrode protection additive forms a uniform protection film on the surface of an electrode to improve the interface stability, the electrolyte stabilizing additive inhibits decomposition and oxidation reactions in a wide temperature range, and stable performance and high conductivity of the electrolyte are guaranteed through a synergistic effect.

The invention provides a lithium ion gel electrolyte, a preparation method and application. Relates to the field of lithium ion battery electrolyte preparation. The polymer monomer in the lithium ion gel electrolyte provided by the invention is pentaerythritol tetraacrylate with a fluorine group, a silane group or a siloxane group, so that the interface stability, the mechanical strength and the chemical stability of the battery can be remarkably improved on a micro level, and the cycle performance and the storage performance of the lithium ion battery are effectively improved.

The invention relates to an electrode pole piece and a lithium ion battery in the technical field of lithium batteries, the electrode pole piece comprises an electrode pole piece and a diaphragm, the electrode pole piece comprises a current collector and an active material layer at least arranged on one side of the current collector, the electrode pole piece further comprises a functional layer, one side of the functional layer is attached to the active material layer, and the diaphragm is arranged between the active material layer and the functional layer. The other side of the functional layer is attached to the diaphragm, and the functional layer comprises an inorganic solid electrolyte, a polymer and a conductive agent. The functional layer is arranged on the electrode plate, so that the interface stability and the electrochemical working window of the diaphragm and the active substance layer are improved, and the inorganic solid electrolyte, the polymer solid electrolyte and the conductive agent in the functional layer act together, so that the internal resistance of the battery can be reduced, and the lithium ion cycle performance is improved; and thus, the fast charge and high-rate discharge performance of the battery is improved.

The invention discloses a high-voltage fast-charging electrolyte and a preparation method and application thereof, the electrolyte comprises an electrolyte lithium salt, an organic solvent and an additive, the organic solvent comprises a carbonic ester organic solvent and a carboxylic ester organic solvent, and the additive comprises a film-forming additive, a resistance-reducing additive and a high-voltage additive; wherein the mass content of the film-forming additive is recorded as W1, the mass content of the resistance-reducing additive is recorded as W2, and the mass content of the carboxylic ester organic solvent is recorded as Ws by taking the electrolyte as a reference, so that W1 / Ws is more than or equal to 0.003 and less than or equal to 0.125; and / or 0.01 < = W2 / Ws < = 0.25. The formula composition and the content of the electrolyte are optimally designed, and the fast charging performance of the battery under high voltage is greatly improved through the synergistic effect of the solvent and the additive; in addition, the electrolyte is good in interface stability, and the overall performance of the battery is improved.

The invention relates to the technical field of solid-state secondary batteries, and provides a solid-state secondary battery positive electrode, a solid-state secondary battery positive electrode preparation method and a solid-state secondary battery. A first layer on the positive current collector; the first layer comprises positive electrode small particles, solid electrolyte small particles, a conductive agent and a binder; a second layer on the first layer; the second layer further comprises positive large particles, solid electrolyte small particles, a conductive agent and a binder; a third layer on the second layer; the third layer comprises positive electrode small particles, solid electrolyte large particles, a conductive agent and a binder; the micron-sized holes are distributed in the first layer, the second layer and the third layer; the micron-sized holes are filled with solid electrolyte small particles, a conductive agent and a binder; the millimeter-level holes penetrate through the first layer, the second layer and the third layer, and the millimeter-level holes are filled with small solid electrolyte particles, a conductive agent and a binder. The flexibility of a lithium ion transmission path is reduced, and the rate capability is improved.

The invention belongs to the technical field of electrochemical energy storage materials, and particularly relates to a titanium-oxygen cluster electrolyte additive as well as a preparation method and application thereof. The titanium-oxygen cluster and the polycaprolactone derivative are jointly placed in an organic solvent and subjected to an exchange reaction, a modified titanium-oxygen cluster solution is obtained, and after the solvent is volatilized, the titanium-oxygen cluster electrolyte additive is obtained. The preparation method provided by the invention is simple to operate and easy to popularize, and the titanium-oxygen cluster electrolyte additive can be oxidized and decomposed in situ on the surface of an electrode in the battery cycle process to form a TiO2-rich inert interface protection layer only by being mixed into the electrolyte. The titanium-oxygen cluster electrolyte additive can act on a positive electrode interface and a negative electrode interface at the same time, and a formed TiO2 interface protection layer can inhibit surface reactivity, prevent surface reconstruction and impedance accumulation, protect a positive electrode material structure from being damaged, inhibit non-uniform growth of negative electrode lithium dendrites and improve the service life of the lithium ion battery. And the cycling stability and safety of the lithium metal battery under high voltage are effectively improved.

The invention provides an all-solid-state battery and application thereof. The all-solid-state battery comprises a positive pole piece and a negative pole piece, a protective layer is arranged on the surface of the lithium metal negative electrode; and the solid-state electrolyte membrane is arranged between the positive pole piece and the lithium metal negative pole, and the solid-state electrolyte membrane comprises sulfide solid-state electrolyte. According to the all-solid-state battery and the application thereof provided by the invention, the interface stability between the lithium metal negative electrode and the solid electrolyte can be enhanced, side reactions can be reduced, and the all-solid-state battery with long cycle performance can be obtained by combining the all-solid-state battery with the sulfide solid electrolyte provided by the invention.

The invention relates to a core-shell solid electrolyte material, a preparation method thereof and an all-solid-state lithium metal battery. The core-shell solid electrolyte material takes a chloride solid electrolyte as a core, and a fluoride coating layer serving as a shell is formed on the surface of the chloride solid electrolyte through in-situ fluorination. The core-shell solid electrolyte material provided by the invention can avoid contact between the chloride electrolyte core and water vapor and can inhibit side reaction between the chloride electrolyte core and metal lithium and growth of lithium dendrites, so that excellent stability of the chloride electrolyte to humid air and metal lithium is realized.

The invention discloses a nanometer silicon-based negative electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium ion battery negative electrode materials. The invention relates to a preparation method of a nano silicon-based negative electrode material, which comprises the following steps: uniformly mixing silicon nanoparticles, a surface modifier and a solvent to prepare a surface modification reaction suspension of nano silicon, carrying out stirring reaction, centrifugally separating out bottom precipitate, and drying to obtain surface-modified nano silicon; dispersing the surface-modified nano silicon into a methanol solution, adding zinc nitrate and 2-methylimidazole, dissolving the zinc nitrate and the 2-methylimidazole to obtain a uniform suspension, performing stirring reaction, performing centrifugal separation to obtain bottom precipitate, and washing and drying the precipitate to obtain composite material powder; and sintering the composite material powder in a reducing atmosphere to obtain the nano silicon-based negative electrode material. The problems of poor structure uniformity, insufficient pore structure optimization, high cost and complexity, weak interface bonding and the like are solved.

The invention discloses a negative electrode structure and an all-solid-state battery containing the same, the negative electrode structure comprises a halide solid electrolyte and a metal negative electrode, and a thin film layer with the thickness less than or equal to 5 microns is arranged between the halide solid electrolyte and the metal negative electrode; the thin film layer is a composite sulfide thin film or a polymer thin film formed by in-situ curing. According to the negative electrode structure, the uniform thin film layer with high ionic conductivity, thin thickness and certain mechanical strength is arranged between the halide solid electrolyte and the metal negative electrode, and the thin film layer, the metal negative electrode and the halide solid electrolyte are assembled into the integrated negative electrode structure, so that the halide solid electrolyte and the negative electrode can be completely separated, and an interface reaction is inhibited; the interface impedance is reduced, a relatively thick sulfide transition layer is avoided, and the safety of the battery can be improved while a high-voltage positive electrode material can be matched, so that the energy density and the performance of the all-solid-state battery are remarkably improved.

The invention discloses a high-entropy porous ferric sodium phosphate pyrophosphate positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion battery positive electrode materials, the positive electrode material takes ferric sodium phosphate pyrophosphate-transition metal as a base material, and the surface is coated with a carbon layer; the specific surface area of the high-entropy porous ferric sodium pyrophosphate positive electrode material is 20-30m < 2 > / g; the chemical formula of the ferric sodium pyrophosphate-transition metal is Na < 4 > Fe < 3-x > M < x > (PO4) < 2 > P < 2 > O < 7 >, the transition metal M comprises at least five of Ti, Cr, Mn, Co, Ni, Cu, Zn, Y, Zr, Ag and Mo. The high-entropy porous ferric sodium phosphate pyrophosphate positive electrode material is prepared by adopting high-entropy porous construction and interface carbon coating synergistic treatment for the first time, so that the structural stability and the specific surface area of the ferric sodium phosphate pyrophosphate are greatly improved; compared with other ferric sodium phosphate pyrophosphate, the high-entropy porous ferric sodium phosphate pyrophosphate is higher in electron transmission speed, shorter in ion diffusion distance, richer in electroactive reaction sites, high in gram volume, stable in electrochemical performance and excellent in rate capability.

The invention provides a three-dimensional composite solid electrolyte membrane, a preparation method thereof and an all-solid-state lithium metal battery. Comprising a homogeneous gel buffer layer, a porous middle layer and a polymer substrate layer which are stacked. In the three-dimensional composite solid electrolyte membrane, the homogeneous gel buffer layer has relatively high mechanical strength and elastic modulus, and can prevent lithium dendrites from puncturing the diaphragm to cause short circuit of the battery; the porous middle layer can increase the contact area between the film layers on the two sides and the electrode, more transmission channels are provided for lithium ions, transmission resistance is reduced, the ionic conductivity is improved, the battery can be charged and discharged more rapidly, the rate performance of the battery is improved, meanwhile, the excellent mechanical stability is achieved, and the cycle life of the battery is prolonged; the polymer substrate layer has excellent mechanical strength and interface stability. The three film layers cooperate to effectively inhibit chemical side reactions between the three-dimensional composite solid electrolyte film and the positive and negative electrodes, reduce the interface impedance and improve the overall electrochemical performance of the battery.

The invention relates to the technical field of electrolyte preparation, and discloses a lithium ion battery electrolyte capable of ensuring low-temperature discharge characteristic, which comprises the following components in percentage by mass: 25% of propylene carbonate (PC), 35% of dimethyl carbonate (DMC), 20% of gamma-butyrolactone (GBL), 20% of ethyl acetate, 1.0 mol / L of lithium salt bis (trifluoromethanesulfonimide) (LiTFSI), 3% of additive 1, 3-propane sultone (PS) (mass fraction: 0.1% of sodium hydroxide (mass fraction: 0.1% of sodium hydroxide), and the balance of water. According to the present invention, the low temperature performance of the solution is improved, the unique solvent formula and the unique solvent ratio enable the electrolyte to have good fluidity in the low temperature environment, and the freezing point of the electrolyte is effectively reduced so as to ensure that the lithium ions can smoothly migrate between the electrodes at the low temperature, such that the lithium ion battery performance is improved, and the lithium ion battery performance is improved. The discharge performance of the battery under a low-temperature condition is obviously improved, and the application scene of the lithium ion battery is expanded.

The invention belongs to the technical field of battery materials, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. The preparation method of the modified high-nickel ternary positive electrode material provided by the invention comprises the following steps: 1) mixing a lithium source, a precursor, a tellurium source and a divalent metal compound, and performing first calcination to obtain a first calcined product; (2) dissolving tellurate in an organic solvent, mixing and grinding the formed tellurate organic solvent solution and the first burning product obtained in the step (1), and then carrying out second burning to obtain a second burning product; the tellurate is selected from at least one of potassium tellurite and sodium tellurite; and (3) washing the secondary calcined product obtained in the step (2) with water, mixing with boric acid, and carrying out third calcination to obtain the modified high-nickel ternary positive electrode material. Through the specific preparation method and the synergistic effect among the steps, the obtained modified high-nickel ternary positive electrode material has good specific capacity, first effect and cycle performance.

The invention relates to the technical field of sodium electric materials, and discloses a composite sodium iron sulfate positive electrode material and a preparation method thereof, a positive electrode and a sodium ion battery. The composite sodium iron sulfate positive electrode material, the particles of the positive electrode material include a sodium iron sulfate matrix, a three-dimensional conductive network embedded in the sodium iron sulfate matrix, and a conductive coating layer coated outside the sodium iron sulfate matrix; the three-dimensional conductive network and the conductive coating layer are both formed by PEDOT. The preparation method comprises mixing PSS, EDOT, sodium sulfate, ferrous sulfate and an oxidant as an initiator in an aqueous solution to fully react to obtain a precursor solution; drying the precursor solution, and then heat treating to obtain a composite sodium iron sulfate positive electrode material. The positive electrode is prepared using the above-mentioned positive electrode material. The sodium ion battery comprises the above-mentioned positive electrode. The positive electrode material has good conductivity, capacity, rate and interface stability.

The invention relates to the technical field of preparation of a sodium ion battery positive electrode material, in particular to a method for activating oxidation reduction of layered oxide oxygen ions by adopting ZrO2 coating and adopts a resonance mode of gradient rotation and revolution (gradient rotation resonance) to enable a very small amount of ZrO2 to be uniformly dispersed in layered oxide particles. Therefore, ZrO2 is uniformly coated on the surface of the layered oxide; the synergistic effect of ZrO2 coating and Zr < 4 + > doping can catalyze the oxidation-reduction reaction of oxygen ions of the layered oxide within the voltage range of 2-4 V, the dissolution of the oxygen ions is inhibited while the extra discharge gram specific capacity is provided, and the interface stability of the material is improved.

The invention provides a positive electrode lithium supplementing material and a preparation method and application thereof. The positive electrode lithium supplementing material is a non-stoichiometric ratio compound, the chemical composition of the positive electrode lithium supplementing material is Li (2-x) Mn (1-y) MyO3, M is a doping element, x is more than 0 and less than or equal to 0.2, and y is more than or equal to 0 and less than or equal to 0.2; the valence state of M is not + 4, or the pure-phase lithium oxide of M and the layered Li2MnO3 material are isomerized. The positive electrode lithium supplementing material has a good lithium supplementing effect, and also has relatively low activation difficulty and excellent interface stability.

The invention discloses a perovskite solar cell which comprises a conductive glass layer, an electron transport layer, a perovskite layer, a hole transport layer and a metal electrode layer which are stacked, and the perovskite layer is made of FAPbI3; the perovskite solar cell is characterized by further comprising a 2D perovskite seed layer arranged between the electron transport layer and the perovskite layer, and the 2D perovskite seed layer provides a nucleation site for formation of an alpha-FAPbI3 phase of the perovskite layer; the 2D perovskite seed layer is prepared by the following steps: 1) dissolving organic amine, PbO and MACl in a mixed aqueous solution of HI and H3PO2, heating while stirring to react, and then cooling and separating out to obtain a 2D perovskite seed single crystal; and 2) preparing the 2D perovskite seed single crystal into a seed precursor solution, coating the surface of the electron transport layer with the seed precursor solution, and annealing to obtain the 2D perovskite seed layer.

The invention discloses a preparation method and application of a gradient polymerized solid-state battery electrode, and belongs to the technical field of chemical power sources. The method specifically comprises the following steps that NASICON type inorganic solid-state electrolyte Na3Zr2Si2PO12 is distributed in an electrode material in a gradient mode to prepare a pole piece, an electrolyte precursor solution containing cyclic ether monomers and an initiator is injected into the pole piece, the NASICON type inorganic solid-state electrolyte Na3Zr2Si2PO12 distributed in the gradient mode inhibits the action of the initiator and the cyclic ether monomers, and the cyclic ether monomers and the cyclic ether monomers are separated from each other. The gradient polymerization of the cyclic ether-based polymer electrolyte in the electrode is realized, the gradient polymerized solid-state battery electrode is obtained, and the additive amount gradient of the NASICON type inorganic solid-state electrolyte Na3Zr2Si2PO12 is reduced in the direction from the near current collector to the far away from the current collector. The invention provides an innovative electrode scheme for the realization of a high-power and high-cycle-stability solid-state battery.

This invention belongs to the technical field of lithium battery anode materials, specifically relating to a highly conductive graphite electrode material and its preparation method. The preparation method includes: pre-dissolving sodium carboxymethyl cellulose into a gel solution, then ball-milling and mixing graphite and conductive carbon black, dispersing them together with a cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and hafnium diboride nanomaterials in the gel solution, adjusting the acidity, adding styrene-butadiene rubber emulsion to obtain a uniform slurry, and then coating, drying, and compacting to obtain the anode sheet. This invention significantly improves the conductivity and structural stability of the graphite anode through the synergistic effect of the interface modification of the cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and the conductive framework of the hafnium diboride nanomaterials. The process is safe and controllable, and suitable for industrial production of lithium-ion batteries.

The present invention discloses a reinforced polyethylene oxide solid electrolyte and a preparation method thereof. Part of the thiol groups in the thiol polyethylene glycol thiol group reacts with the propenyl group in the three-dimensional framework LLZAO containing a propenyl group, and the remaining part of the thiol groups in the thiol polyethylene glycol thiol group reacts with the propenyl group in cerium acrylate to play a cross-linking role. The multi-level solid electrolyte structure design effectively isolates the direct contact between succinonitrile and the lithium anode, prevents adverse reactions at the interface, and thus prolongs the service life and stability of the battery. The solid electrolyte prevents the growth of lithium dendrites through its physical barrier effect, because its higher modulus can effectively inhibit the irregular diffusion of lithium in the electrolyte and improve the safety of the battery.

The invention provides application of polysulfide in a lithium metal battery, the lithium metal battery and a solid-state battery. Wherein the polysulfide is used as an electrolyte of a lithium metal battery or an additive of a polymer electrolyte; the structural general formula of the polysulfide is Li2Sn, and n is greater than 2 and less than or equal to 6. Polysulfide can react with lithium metal to generate Li2S2 / Li2S, so that chemical components of an SE I layer interface are changed, a sulfur-containing inorganic SE I layer is formed on the surface of a negative electrode, and the mechanical property of the SE I layer and the interface stability of electrolyte / electrolyte and metal lithium are improved; and the Li2S2 / Li2S can also reduce the transfer impedance of Li < + >, promote the uniform deposition of lithium ions and inhibit the growth of lithium dendrites. And on the other hand, the high polarizability between Li < + > and the polysulfide anion Sn < 2-> can weaken the combination of a solvent or a polymer substrate and Li < + >, accelerate the migration of Li < + > and promote the diffusion rate of Li < + > in the battery.

The invention belongs to the field of organic electrolytes and potassium ion batteries, and particularly relates to a low-concentration ionic liquid electrolyte for breaking the concentration balance of potassium ions and anions and a high-energy-density potassium ion battery. The potassium ion battery comprises a Prussian blue (PB) positive electrode, an electrolyte and a commercial ferrocene (Fc) negative electrode which is not subjected to any treatment, and the electrolyte is a low-concentration ionic liquid electrolyte (FSI-: K + (3.5 / 0.3 M)) of potassium bis (fluorosulfonyl) imide (KFSI). The low-concentration ionic liquid electrolyte developed by the invention has a high anion: K < + > concentration ratio (3.5: 0.3 M), increases the solvation proportion of rich anions, reduces the dissolution of an Fc organic metal compound, and ensures high interface stability and rapid K < + > storage kinetics of an Fc negative electrode. Meanwhile, the electrochemical window of the low-concentration electrolyte is widened, the PB positive electrode can stably circulate at 1.0-4.4 V, the long-period circulation and excellent rate capability of the PBFc total battery are also realized, and the total battery has the energy density of 246.7 Wh / kg under the current density of 20 mA / g.