221 results about "Electrochemical window" patented technology

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 discloses a solid electrolyte, a preparation method thereof and an all-solid-state battery, and belongs to the technical field of solid electrolytes. According to the preparation method, a nano inert oxide and a solid electrolyte raw material are compounded through mechanical grinding, and the solid electrolyte with a core-shell structure is prepared; the device comprises an inner core, an interface layer and a shell from inside to outside, the inner core is a solid electrolyte matrix, the interface layer is a transition layer generated by reaction of the solid electrolyte matrix and a nano inert oxide, and the shell is a nano inert oxide layer. The material combines the advantages of high moisture resistance and wide electrochemical window of the nano inert oxide and the characteristics of high ionic conductivity and excellent mechanical property of the solid electrolyte, and the comprehensive performance of the material is remarkably improved through the synergistic effect of the components. The composite structure design not only solves the problem of performance limitation of a single material system, but also realizes collaborative optimization of ionic conductivity, environmental adaptability and electrochemical stability while ensuring the material stability.

The invention discloses a biosynthetic bacterial cellulose-based solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolytes. The solid electrolyte is prepared by taking modified bacterial cellulose prepared by fermenting acetobacter xylinum, rhizobium, pseudomonas, azospirillum, alcaligenes and other bacteria as a substrate, introducing a low-molecular-weight polymer to regulate and control the arrangement of cellulose molecular chains to serve as a conductive ion framework, and then compounding a conductive ion high-molecular-weight polymer and a lithium salt. According to the invention, cellulose molecular chains are modified by modified glucose, and a network structure is regulated and controlled by a low-molecular-weight polymer, so that the problems of small spacing, lack of ion coordination sites and weak ion transmission capability of pure cellulose molecular chains are effectively solved, the ionic conductivity of the prepared solid electrolyte can reach 10 <-4 > S cm <-1 >, the electrochemical window width reaches 5V, and the solid electrolyte has a good application prospect. The material can tolerate high critical current density, is suitable for various positive electrode materials, and is suitable for high-voltage and long-cycle-life energy storage devices.

The invention discloses a fast-charging lithium ion battery electrolyte, a preparation method thereof and a lithium ion battery containing the fast-charging lithium ion battery electrolyte. The fast-charging lithium ion battery electrolyte comprises the following components: electrolyte salt, an organic solvent and an electrolyte additive, the electrolyte additive comprises a first additive and a second additive; the first additive is a multi-element sulfate ester additive, and the mass percentage of the multi-element sulfate ester additive is 0.05%-2% based on the total mass of the electrolyte being 100%. By adding the polybasic sulfate additive with a specific structure, adopting a composite solvent system and cooperating with the synergistic effect of other additives, lithium salt and other components, dual stability of positive and negative electrode interface films is realized, the electrochemical window of the electrolyte is widened, and the thermal stability and cycling stability of the electrolyte are improved; and finally, the battery has the advantages of fast charging capability, high voltage compatibility, long cycle life and high thermal safety at the same time.

The invention belongs to the technical field of polymer electrolyte membrane materials, and particularly relates to a high-ionic-conductivity polymer electrolyte membrane and a preparation method thereof.The preparation method comprises the steps that 1, PEO and lithium salt are added into a polar aprotic solvent, and the mixture is rapidly and violently stirred to be completely dissolved; (2) adding a cross-linking agent and a photoinitiator into the mixed solution, and violently stirring to obtain a mixed solution; and (3) coating the mixed solution in a polytetrafluoroethylene template, heating to remove the solvent, and performing ultraviolet radiation. According to the invention, a three-dimensional cross-linked network is formed by photocuring of an acrylate group of the cross-linking agent, PEO chain segment crystallization is inhibited, and lithium salt anions (such as TFSI-) are physically embedded. A benzene ring structure in a cross-linked network endows the electrolyte membrane with flexibility, mechanical property deterioration caused by a plasticizer or a diluent is avoided, the compact structure of the electrolyte membrane can inhibit lithium dendrite growth, the ionic conductivity reaches 1.7 * 10 <-4 > S / cm, and the electrochemical window reaches 4.9 V. The method is simple in process and suitable for large-scale preparation of the high-energy-density solid-state lithium battery.

The invention discloses a preparation method of a polymer-sulfide solid electrolyte based on multi-scale interface design and application of the polymer-sulfide solid electrolyte in an all-solid-state lithium battery, sulfide electrolyte particles with three complementary functions of Li10SiP2S12, Li7P2S8I and Li3PS4 are utilized, and a compact and ion transmission path optimized structure is formed in a polymer matrix through a gradient distribution technology; the micron-sized particles construct a high-speed ion conduction trunk, the nano and submicron particles are tightly filled to greatly reduce the interface impedance, meanwhile, the introduction of Li7P2S8I widens an electrochemical window from the source of the material, the self-repairing functional component on the outermost layer endows the interface with dynamic intelligent response capability, and when the interface generates microcracks, the self-repairing functional component on the outermost layer can repair the surface of the material. Dynamic bonds contained in the material can be reversibly broken and reconstructed, self-repairing of damage is achieved, the endurance capacity of an interface to mechanical and chemical strain caused by temperature change and long-term circulation is enhanced, and finally high ionic conductance, excellent interface stability and wide temperature range adaptive capacity are successfully and cooperatively achieved.

The invention discloses a polymer electrolyte composite material for a high-temperature-resistant solid-state battery and a preparation method of the polymer electrolyte composite material, and belongs to the technical field of solid-state battery materials. The preparation method comprises the following steps: preparation of key functional components, preparation of a precursor solution, dispersion and compounding of the filler, film casting and heat treatment, and post-treatment. A dynamic thioether bond is introduced into a main chain to construct an oxygen-sulfur synergistic coordination network, and a multi-component interface chemical bonding and gradient curing process is combined, so that the problems that the ionic conductivity and the mechanical strength of the traditional polymer electrolyte cannot be considered at a high temperature, the filler is easy to agglomerate, the membrane has many defects and the like are solved; the obtained material still keeps high ionic conductivity and excellent mechanical stability at 150 DEG C, has a wide electrochemical window, and is suitable for high-safety and high-energy-density solid-state batteries.

The application relates to the technical field of solid-state batteries, in particular to a halide oxyde and a preparation method and application thereof. The application takes a molten salt Li a M b X c as raw material, reacts with an oxide A d O f in a molten state, removes steam impurities by means of high-temperature vacuum extraction, and obtains the halide oxyde solid-state electrolyte after cooling; the molten salt raw material is melted into an ionic melt at high temperature, oxygen elements are introduced to replace part of halogens, the hardness of the target electrolyte is reduced after cooling, the deformation ability at room temperature is improved, the obtained electrolyte has high conductivity, a wide oxidation electrochemical window, and the like. The prepared halide oxyde solid-state electrolyte is used for preparing a positive electrode, and the adhesion, actual micro contact area and ion migration rate between the electrolyte and positive electrode material particles are improved through melt infiltration, the positive electrode interface problem is effectively relieved, and the electrochemical performance of the full solid-state battery is improved.

The invention provides a negative plate of a solid-state battery. The negative plate comprises a current collector, a lithium-loving coating compounded on the current collector and a conductive layer compounded on the lithium-loving coating, the lithium-loving coating contains a lithium-loving element; the lithium-loving element comprises one or more of Mg, Pt, Sn, Ag, Al and Zn; and the conductive layer comprises a carbon material. By introducing the lithium-loving element and the high-potential material and utilizing a synergistic mechanism of the lithium-loving element and the high-potential material, the electrochemical window is further widened and the metal lithium deposition risk is reduced while the lithium deposition uniformity is improved. According to the negative electrode plate provided by the invention, the nucleation potential of the lithium-metal negative electrode plate and the resistance of the conductive material are controlled within a specific range, so that nucleation of lithium ions on the surface of the negative electrode current collector can be facilitated, meanwhile, the nucleation uniformity of the lithium ions on the surface of the negative electrode current collector can be improved, and the cycle life of the battery is further prolonged.

The invention belongs to the field of batteries, and particularly relates to a solid-state polymer electrolyte composite membrane, a preparation method thereof and a solid-state battery. The solid polymer electrolyte composite membrane comprises an MOF functional layer, an anti-reduction coating and an anti-oxidation coating, wherein the anti-reduction coating and the anti-oxidation coating are arranged on the two sides of the MOF functional layer respectively; the MOF functional layer comprises an intermediate layer base material formed by an organic polymer, and an inorganic solid electrolyte and an MOF-based ionic conductor MOF-ILE which are dispersed in the intermediate layer base material; the MOF-based ionic conductor MOF-ILE comprises an MOF material, an ionic liquid and a lithium salt. The electrolyte membrane can meet the multifunctional requirements of all-solid-state batteries, including high ionic conductivity of the electrolyte membrane, good electrode-solid electrolyte membrane interface compatibility, high electrochemical window, excellent mechanical strength and electrochemical stability, so that the electrical performance of the all-solid-state batteries is remarkably improved.

The invention discloses a sulfide solid electrolyte and a preparation method thereof, and relates to the technical field of batteries. The sulfide solid electrolyte comprises a Li6PS5Cl inner core and a Li3PO4 coating layer, wherein the surface of the Li6PS5Cl inner core is coated with the Li3PO4 coating layer. And the Li3PO4 coating layer can effectively block moisture and oxygen and inhibit the hydrolysis reaction of Li6PS5Cl. Compared with traditional Al2O3 coating, the Li3PO4 coating layer and Li6PS5Cl are high in lattice matching degree, the interface bonding force is high, and secondary reaction caused by falling can be effectively avoided. The introduced Li3PO4 can be used as a barrier layer or redox reaction of Li6PS5Cl is inhibited through a surface chemical passivation mechanism, the electrochemical window of the Li6PS5Cl material is improved, electron leakage can be reduced, and the material is very suitable for a high-voltage positive electrode material system and can significantly improve the energy density of a battery.

The invention discloses a sulfur-containing all-solid-state polymer electrolyte membrane, a preparation method and a lithium metal battery, and belongs to the technical field of polymer electrolytes.The method comprises the steps that 1, 4-phenylene-diacrylate and dimethyl tetrasulfide are evenly mixed and cooled to the room temperature after a reverse vulcanization reaction, and a polymer solid is obtained; the preparation method comprises the following steps: dissolving a polymer solid in dimethyl sulfoxide, adding bis (trifluoromethanesulfonyl) lithium imide, uniformly stirring and mixing, casting in a PTFE (Polytetrafluoroethylene) mold, uniformly spreading, and carrying out vacuum drying to obtain the sulfur-containing all-solid-state polymer electrolyte membrane. The ion transmission function of a liquid electrolyte is replaced by the solid ion conduction property, and the physical isolation function of a diaphragm is replaced by a compact and firm physical structure, so that the Li < + > diffusion energy barrier is reduced, the electrochemical window is widened, the interface impedance is reduced, and the interface compatibility between the positive and negative electrode materials and the solid electrolyte is improved; the lithium metal battery assembled by the electrolyte has excellent electrochemical performance and cycle performance.

The invention provides a wide-temperature-range high-specific-energy fluorinated gel electrolyte and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. Comprising a lithium salt, a (methyl) acrylate monomer and a fluorinated sulfonate plasticizer, the molar concentration of the lithium salt relative to the total volume of the fluorinated sulfonate plasticizer and the (methyl) acrylate monomer is 2-5 mol / L, and the volume ratio of the (methyl) acrylate monomer to the fluorinated sulfonate plasticizer is (2-4): (8-6). The gel electrolyte not only has the characteristics that the ionic conductivity at room temperature exceeds 2 mS / cm and the electrochemical window exceeds 5 V, but also has good stability matched with a high-voltage positive electrode and stability matched with a lithium metal negative electrode and a silicon carbon negative electrode, and shows good cycle performance in a wide temperature range (-20 to 60 DEG C).

The invention relates to a solid electrolyte membrane and a preparation method thereof, and belongs to the technical field of lithium battery solid electrolyte. According to the invention, after the selected acrylate monomer as shown in the formula I is polymerized, the crystallinity of the fluorine-containing polymer is reduced, more space is provided for ion conduction, the dissociation effect of the lithium salt is enhanced, and the free ion concentration is increased; the precipitation-method white carbon black limits anion movement through abundant hydroxyl groups, so that the lithium ion transference number is increased; under the combined action of the three factors, the ionic conductivity of the solid electrolyte membrane is greatly improved. The fluorine-containing polymer has good toughness and self-supporting effect and wide electrochemical window and thermal stability, so that the application range of the solid electrolyte and the energy density, rate capability and service life of a battery using the electrolyte are improved on the whole.

The invention provides a composite electrolyte film and a preparation method thereof and a secondary battery, and belongs to the field of lithium battery, the composite electrolyte film comprises a polymer matrix, and a lithium salt and a composite material distributed in the polymer matrix, the composite material comprises a porous oxide solid electrolyte and a halide solid electrolyte filled in pores of the porous oxide solid electrolyte. The invention aims to provide the solid electrolyte with high ionic conductivity, wide electrochemical window and good mechanical property.

The invention discloses a novel sodium ion battery halide solid electrolyte, and belongs to the technical field of electrolyte materials, the molecular formula of the halide solid electrolyte is NaXTaCl5FX, X is equal to 1-3, the halide solid electrolyte is weighed according to the molar ratio of tantalum chloride to sodium fluoride under the protection of argon, and electrolyte matrix mixed powder is obtained through high-energy ball milling; carrying out ball milling on nano silicon dioxide and zinc bromide according to a molar ratio to prepare a sintering aid; the electrolyte matrix mixed powder is pressed into a biscuit piece, and the biscuit piece is subjected to heat treatment in argon to obtain a halide electrolyte matrix; and finally, grinding the halide electrolyte matrix, doping a sintering aid, tabletting, sintering and ball-milling to obtain the novel sodium-ion battery halide solid electrolyte. And densification and structural stability of the material are synergistically realized, and finally the solid electrolyte with high ionic conductivity and wide electrochemical window is obtained.

The invention belongs to the technical field of solid-state battery systems, and particularly discloses a high-voltage-resistant cross-linked polymer solid-state electrolyte and a preparation method thereof.The preparation process of the solid-state electrolyte comprises the steps that a polymer and lithium salt are weighed and added into a solvent to be dissolved, then a certain amount of a high-voltage additive, a certain amount of a cross-linking agent and a certain amount of a plasticizer are added, the mixture is stirred to be uniform, and the high-voltage-resistant cross-linked polymer solid-state electrolyte is obtained; and then pouring the solution to form a membrane, and obtaining the high-voltage-resistant cross-linked network polymer-based electrolyte membrane by combining a thermal cross-linking technology. The high-voltage resistance of the electrolyte is remarkably improved by forming the CEI layer rich in elements such as P and F, the mechanical property of the polymer solid electrolyte is improved through thermal crosslinking, the ionic conductivity of the solid electrolyte is improved through the plasticizer, and the prepared high-voltage polymer electrolyte has a wide electrochemical window and the lithium dendrite inhibiting capacity and can be used for preparing the high-voltage polymer electrolyte. The material can be matched with a high-voltage nickel-cobalt-manganese ternary positive electrode material, so that the energy density of a solid-state battery can be improved, and the obtained solid-state battery has relatively good long-cycle stability.

The invention discloses a new energy lithium battery and a preparation method thereof, and relates to the technical field of new energy batteries, and the preparation method comprises the following steps: in an aprotic organic solvent, constructing a water-in-oil microemulsion system, and carrying out a reaction on an oil-water interface to synthesize a difunctional electrolyte additive; adding the difunctional electrolyte additive into the basic carbonic ester electrolyte, stirring and dissolving to obtain a functional electrolyte; assembling the high-nickel ternary positive electrode, the silicon-based negative electrode and the ceramic diaphragm by adopting a winding process, and injecting the functional electrolyte to obtain a to-be-formed battery cell; a to-be-formed cell is subjected to first charging and discharging treatment, and dynamic reversible cross-linked flexible solid electrolyte interfaces are formed on the surfaces of a positive electrode and a negative electrode through in-situ polymerization by accurately controlling an electrochemical window. The dynamic self-repairing interface is constructed on the surface of the electrode in situ, so that the contradiction among high energy density, high safety and long service life is fundamentally solved, and the cycle life, intrinsic safety and electrode structure stability of the battery are remarkably prolonged.

Provided in the present disclosure are a solid electrolyte, a preparation method therefor and a secondary battery. The solid electrolyte comprises an oxide solid electrolyte and a shell layer coating the surface of the oxide solid electrolyte, wherein the shell layer comprises a monomer polymer and an ionic liquid. The monomer polymer is obtained by copolymerizing a first polymeric monomer and a second polymeric monomer, wherein the first polymeric monomer comprises one or more of ethylene glycol monomethyl ether acrylic acid, ethylene glycol monomethyl ether methacrylate, ethylene glycol monoethyl ether methacrylate and ethylene glycol monopropyl ether methacrylate; and the second polymeric monomer comprises a fluoroacrylate. F doping is firstly selected to modify LATP in the present disclosure, thereby significantly improving the ionic conductivity of the LATP, and widening the electrochemical window thereof, which is beneficial to improving the hydrophobicity thereof. The inner structure selected in the present disclosure is an LATP material doped with F, which can form better attraction to a C-containing group in the coating layer and cations of the ionic liquid, thereby improving the coating effect of the outer layer.

The invention relates to a preparation method and application of an ethylene sulfite compound, and the preparation method comprises the step of reacting an epoxy compound with sulfur dioxide under the action of an immobilized organic base catalyst to obtain the ethylene sulfite compound. The immobilized organic base catalyst is formed by connecting organic base and chloromethylated resin through chemical bonds, and has good catalytic activity and chemical stability. According to the preparation method provided by the invention, the raw material cost is low, the product is easy to purify, the yield is relatively high, continuous automatic production is easy to realize, and the prepared ethylene sulfite compound is added into the lithium battery electrolyte as an additive, so that the electrochemical window of an electrolyte system can be widened, and the high-voltage interface stability and the cycle performance of the battery can be improved.

The invention discloses a sodium ion battery electrolyte and a sodium ion battery, the preparation raw materials of the electrolyte comprise an electrolyte, an organic solvent and a composite additive, the preparation raw materials of the electrolyte comprise a sodium salt and modified graphite, the preparation raw materials of the modified graphite comprise graphite, dopamine hydrochloride, polyethyleneimine, Sb2O3 and BiCl3, the composite additive is prepared from trimethylsilyl trifluoromethanesulfonate, N-methyl pyrrolidone, vinylene carbonate and nano silicon dioxide. Through synergistic compounding, a high-stability three-dimensional ionic conduction network is constructed, so that the electrolyte has a wide electrochemical window and high ionic conductivity.

The invention provides a lithiated clay mineral PVDF-based composite solid-state electrolyte membrane, a preparation method and application thereof, and a quasi-solid-state battery, and belongs to the technical field of solid-state lithium batteries. The preparation method comprises the following steps: mixing lithium halide, clay minerals and water for the first time, and carrying out ion exchange reaction to obtain lithiated clay minerals; mixing lithiated clay minerals, PVDF, organic lithium salt and an organic solvent for the second time to obtain composite slurry; and applying the composite slurry to the surface of a substrate, and carrying out thermocuring to obtain the lithiated clay mineral PVDF-based composite solid electrolyte membrane. The lithiated clay mineral is introduced into a mixed system of PVDF and organic lithium salt, so that the crystallinity of PVDF can be effectively reduced, an amorphous region is increased, conversion of PVDF crystals to beta-type PVDF is promoted, and the dissociation process of the lithium salt in the electrolyte is promoted; meanwhile, the lithiated clay mineral is introduced, so that the ionic conductivity can be obviously improved, an electrochemical window is widened, the mechanical property is improved, and the growth of lithium dendrites is inhibited.

The invention belongs to the technical field of flexible energy storage devices, and discloses a flexible wearable solid-state zinc battery based on a poly-zwitter ion hydrogel electrolyte and a preparation method thereof. According to the flexible wearable solid-state zinc battery, a poly-zwitterionic hydrogel electrolyte is used as an electrolyte, a current collector is coated with a zinc powder dispersion liquid to serve as a flexible negative electrode, and the current collector is coated with a vanadium-based or manganese-based material dispersion liquid to serve as a flexible positive electrode. The poly-zwitterionic hydrogel electrolyte is prepared by copolymerizing a zwitterionic monomer, an acrylate monomer, a lithium salt and a photoinitiator and soaking in a zinc salt solution, has the characteristics of good mechanical properties, high ionic conductivity, wide electrochemical window and the like due to the unique structure, and can be applied to special environments such as stretching, curling, bending and the like. The preparation process is simple in route, has excellent electrochemical and mechanical properties, is large in specific capacity, is beneficial to large-scale industrialization, and has a good application prospect in flexible electronic equipment, wearable equipment and skin equipment.

The invention discloses a preparation method of a self-repairing LATP composite solid electrolyte membrane, which comprises the following steps: S1, hydroxylating titanium aluminum lithium phosphate nanoparticles, and coating with an isocyanate polyurethane prepolymer to obtain porous PU-LATP particles; s2, carrying out copolymerization on adamantanediol diacrylate, acrylate and furfuryl acrylate, and then carrying out a Diels-Alder reaction with bismaleimide so as to form a reversible cross-linked precursor solution; and S3, mixing the PU-LATP particles with the precursor, a lithium salt and an auxiliary agent, carrying out vacuum defoaming, and drying to obtain the self-repairing LATP composite solid electrolyte membrane. According to the preparation method disclosed by the invention, the solid electrolyte membrane is endowed with the capability of quickly self-repairing microcracks at room temperature, and high ionic conductivity and a wide electrochemical window are considered at the same time; the mechanical strength is obviously improved, the thermal dimensional stability is excellent, and the strict requirements of the solid-state lithium battery on high safety and long cycle life can be met.

The present application relates to an in-situ generated electrolyte additive and its preparation method and application, the additive is a Lewis acid-base complex multifunctional additive; the Lewis acid-base complex multifunctional additive is prepared by adding Lewis acid and Lewis base in conventional electrolyte, and then by the Lewis acid-base coordination reaction between Lewis acid and Lewis base; the additive can be in-situ generated in electrolyte, and has the multifunction of widening the electrochemical window of electrolyte, flame retardation, inhibiting the decomposition and hydrolysis of electrolyte salt, removing harmful impurities of electrolyte, stabilizing electrode material and electrolyte interface and the like.The obtained multifunctional electrolyte containing the additive can be used to improve the working voltage, energy density, power density, cycle life and safety of electrochemical energy storage device, and is easy to popularize and apply.

The invention discloses lithiated cross-linked synanthrin, a preparation method thereof and application of the lithiated cross-linked synanthrin in an organic / inorganic composite solid electrolyte, and relates to the technical field of polymers and solid electrolytes. The lithiated cross-linked synanthrin provided by the invention is prepared by taking sodium hexametaphosphate and the like as a cross-linking agent to cross-link synanthrin and then adding lithium salt to lithiate the cross-linked synanthrin in an ion exchange manner, so that the stability of an organic / inorganic interface in an organic / inorganic composite solid electrolyte can be improved; the composite strength of the organic electrolyte and the inorganic electrolyte is improved, and meanwhile, the three-dimensional cross-linked structure can introduce an additional lithium ion transmission channel into an electrolyte matrix. Based on this, the composite electrolyte prepared by the invention can have significantly improved ionic conductivity and a wider electrochemical window.

The present application relates to an organic-inorganic composite solid electrolyte and a preparation method thereof, which is prepared by compounding an oxide solid electrolyte, an unsaturated polymer crosslinked in situ on the surface of the oxide solid electrolyte, and a polar organic solvent, so as to prepare an organic-inorganic composite solid electrolyte with higher room-temperature ionic conductivity and a wider electrochemical window. The composite solid electrolyte prepared by the present application has a room-temperature ionic conductivity of 0.1 mS / cm or higher, an electrochemical window of greater than 4.5 V, and an alkali metal cation transference number of greater than 0.9. In addition, the composite solid electrolyte is easy to be formed into a film, and the composite solid electrolyte film prepared has a thin thickness. A solid-state alkali metal battery assembled with the electrolyte film has good interface stability with the positive and negative electrodes, and can inhibit the growth of alkali metal dendrites, thereby significantly improving the performance of 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.

The invention relates to the field of a high-performance electrolyte preparation technology and a battery, and discloses a preparation method of a polymer electrolyte initiated by ionic liquid and adaptability of the polymer electrolyte to a high-voltage positive electrode. In order to solve the technical problems of low room-temperature ionic conductivity and narrow electrochemical window of the solid polymer electrolyte at the present stage, the solid polymer electrolyte is realized by taking treated high-purity ionic liquid as an initiator and adding a positive electrode film-forming additive. The ionic liquid is used as an initiator, so that rapid conduction of lithium ions is promoted, and meanwhile, the conductivity and the transference number of the electrolyte are effectively improved. By adding the positive electrode film-forming additive, the electrochemical window of the battery is obviously widened and reaches 5.0 V. The battery assembled through in-situ curing still shows stable cycle performance under high voltage, and has a wide research prospect in the field of solid-state lithium batteries.

The invention provides a three-dimensional multi-stage needle tip array type Bi-CuO integral electrode as well as a preparation method and application of the three-dimensional multi-stage needle tip array type Bi-CuO integral electrode. The integral electrode comprises foamy copper, a copper oxide needle tip array layer growing on the foamy copper and a bismuth nanosheet array layer uniformly covering the surface of a copper oxide needle tip. The integral electrode has a multi-stage self-supporting structure, so that catalyst aggregation or stacking is effectively avoided, and the specific surface area of exposed active sites is remarkably increased; and the electrode also has multiple heterogeneous interfaces, and shows excellent catalytic activity, selectivity and electrochemical window when being used as a working electrode for electrically reducing CO2 to prepare formate. The preparation method comprises the following steps: generating the copper hydroxide nanowire layer on foamy copper in situ by using a chemical oxidation method, performing annealing treatment in air to form the copper oxide needle tip array layer, and depositing the bismuth nanosheet array layer on the surface of the copper oxide needle tip by using a wet chemical method to obtain the integral electrode. The preparation method is novel and simple, the use of a binder is avoided, the operability is high, and the preparation method has a good application prospect.