449results about How to "Improve electrochemical stability" patented technology

The invention relates to semi-bio-based polyamide containing a cross-linked structure as well as a preparation method and application of the semi-bio-based polyamide, and belongs to the technical field of polyamide preparation. The semi-bio-based polyamide containing the cross-linked structure contains a structure shown in a formula (I), 2, 5-furandicarboxylic acid taken from a bio-based material, a derivative monomer of the 2, 5-furandicarboxylic acid and aromatic diamine are used as raw materials for polycondensation, and aromatic triamine is used as a cross-linking agent. The semi-bio-based polyamide with the cross-linked structure provided by the invention has excellent thermal stability, excellent mechanical property, excellent wettability to electrolyte and outstanding chemical stability and electrochemical stability, can be applied to a lithium ion battery diaphragm, and can be used as a lithium ion battery diaphragm coating material with excellent performance and durability. The performance of the diaphragm is further improved, so that the battery capacity, the cycle and rate discharge performance, the safety and the like are improved.

The invention discloses a method for preparing a composite iron-based polyanion positive electrode material. The structural formula of the positive electrode material is represented as Na4Fe3 (PO4) 2 (P2O7) (at) Camp, mXenes are sodium ferric pyrophosphate compositely coated by an MXenes material and a carbonaceous precursor, and the preparation method comprises the following steps: weighing a sodium source, a ferrous source, a phosphorus source and a carbon source according to a stoichiometric ratio, uniformly mixing, grinding, spray-drying and sintering at high temperature to obtain the composite iron-based polyanion positive electrode material, and the carbon source comprises iron-nickel doped polyethylene glycol. The composite iron-based polyanion positive electrode material provided by the invention is remarkably improved in the aspects of energy density, rate capability and cycle life, and the preparation process is simple to operate, reliable in flow, quick in preparation process and easy for industrial production, so that an ideal scheme is provided for commercialized sodium ion battery positive electrode materials.

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.

The invention provides an electrolyte composition, a secondary liquid injection method and a battery. The electrolyte composition suitable for secondary liquid injection comprises a first electrolyte for primary liquid injection and a second electrolyte for secondary liquid injection, the first electrolyte comprises 0.01 to 5 weight percent of vinylene carbonate, 0.05 to 3 weight percent of a first additive, 0.01 to 5 weight percent of a second additive, 5 to 15 weight percent of lithium salt, 0.01 to 5 weight percent of a film-forming additive and the balance of a non-aqueous organic solvent; the second electrolyte comprises 5 to 30 weight percent of vinylene carbonate, 0.01 to 10 weight percent of first additive, 5 to 15 weight percent of lithium salt and the balance of non-aqueous organic solvent; wherein the first additive comprises a compound as shown in a formula 1; the second additive comprises a compound as shown in a formula 2. The electrolyte composition provided by the invention can enable the battery to present low gas yield, low initial DCR and normal-temperature and high-temperature cycle performance.

The invention relates to the technical field of lithium ion batteries, in particular to a modified cobalt-free lithium-rich manganese-based positive electrode material doped with anions and cations and a preparation method of the modified cobalt-free lithium-rich manganese-based positive electrode material. According to the method, a modified lithium-rich manganese-based precursor is prepared from a metal salt solution, a precipitator, a fluorine source and a complexing agent, and the anion-cation co-doped cobalt-free lithium-rich manganese-based positive electrode material is prepared from the modified lithium-rich manganese-based precursor and a lithium source. The metal salt solution contains manganese salt, nickel salt and aluminum salt. According to the method, by doping Al and F, the voltage attenuation is effectively reduced, the long cycle performance of the material is improved, the rate capability of the material is improved, and in addition, mixed arrangement of lithium and nickel cations is effectively inhibited, so that the cycle stability is improved.

The invention belongs to the technical field of lithium ion batteries, and discloses a carbon compatible binder for a silicon-carbon negative electrode of a lithium ion battery and a preparation method and application of the carbon compatible binder for the silicon-carbon negative electrode of the lithium ion battery. Then N-hydroxysuccinimide and 1-ethyl-(3-dimethylaminopropyl) carbodiimide are added to activate carboxyl of sodium carboxymethyl cellulose, finally 1-pyrene methylamine hydrochloride is added, N2 is introduced at the room temperature, and a reaction is performed under stirring. According to the binding agent, sodium carboxymethyl cellulose is used as a main chain to be subjected to amidation reaction with 1-pyrene methylamine hydrochloride, pi-pi conjugation can be formed by introduced pyrene groups and graphite in a silicon-carbon material, the interface compatibility of the binding agent and the silicon-carbon material can be effectively improved, the dispersity and the binding property of the silicon-carbon material are enhanced, and the binding agent can be used for preparing the silicon-carbon material. And the electrochemical performance of the silicon-carbon negative electrode of the lithium ion battery is obviously improved.

The invention discloses an anti-phosphoric-acid platinum-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of fuel cells. The preparation method of the anti-phosphoric acid platinum-based catalyst comprises the following steps: mixing a carbon-supported platinum catalyst and molybdate in ethylene glycol, and carrying out condensation reflux to obtain a molybdenum oxide modified carbon-supported platinum catalyst; mixing the molybdenum oxide modified carbon-supported platinum catalyst and dopamine hydrochloride in a buffer solution, stirring for the first time, adding transition metal salt, stirring for the second time, performing suction filtration, and drying to obtain a pretreated molybdenum oxide modified platinum-based alloy catalyst; and carrying out annealing treatment on the pretreated molybdenum oxide modified platinum-based alloy catalyst to obtain the anti-phosphoric acid platinum-based catalyst. The anti-phosphoric acid platinum-based catalyst has excellent oxygen reduction initial activity, anti-phosphoric acid performance and electrochemical stability, and can effectively solve the problem of phosphoric acid poisoning of a platinum-based catalyst of a high-temperature proton exchange membrane fuel cell.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of an ultrahigh nickel positive electrode material, which comprises the following steps: S1, mixing a ternary precursor with a cerium source and a lithium source, and obtaining Ce-NCM by a high-temperature solid-phase method; s2, carrying out ball-milling mixing on a lanthanum source, a zirconium source and other metal sources, carrying out heat treatment after mixing to obtain doped La2Zr2-xMxO7, and carrying out ball-milling to obtain nanoscale La2Zr2-xMxO7 ion conductor powder; s3, uniformly mixing and stirring the Ce-NCM and the organic coating medium solution, adding the mixture into a second solvent for mixed precipitation, filtering, washing and drying to obtain a positive electrode material Ce-PNCM; and S4, mixing the nanoscale La2Zr (2-x) MxO7 ion conductor powder prepared in S2 with a positive electrode material Ce-PNCM through a high-speed mixer, and carrying out secondary heat treatment under the condition of protective gas to obtain the cerium-doped double-coating-layer ultrahigh nickel positive electrode material. The positive electrode material prepared by the method disclosed by the invention is low in surface soluble lithium residual quantity, high in surface coating uniformity, good in electrochemical stability, good in cycle performance and high in charge-discharge capacity.

The invention belongs to the technical field of flow batteries, and discloses a nano-carbon layer modified graphite felt electrode for an all-vanadium flow battery, and a preparation method and application of the nano-carbon layer modified graphite felt electrode. The preparation method comprises the following steps: carrying out heat treatment on a graphite felt to form runner structures which are arranged in parallel on the surface of the graphite felt; and then glow discharge cleaning treatment is conducted under the vacuum condition, a closed field unbalanced magnetron sputtering ion plating technology is adopted, a HiPIMS power source is adopted for sputtering the graphite target material, a functional nano carbon layer is deposited on the surface of the flow channel structure arranged in parallel, and therefore the nano carbon layer modified graphite felt electrode with the multi-stage active structure on the surface is obtained. The preparation method has the advantages of mild conditions, simple process, easy operation, easily available raw materials, low preparation cost, and easy industrial production; the nano carbon layer modified graphite felt electrode has excellent electrochemical reaction activity, electrochemical reaction reversibility, conductivity, wettability to electrolyte and electrochemical performance stability.

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

The invention relates to a rare earth oxyhalide solid electrolyte and a preparation method and application thereof, the structure of the rare earth oxyhalide solid electrolyte is an amorphous structure, and the chemical general formula is Li < 3-y > MOX < 4-y >, wherein M comprises any one or a combination of at least two of Sc, Y or lanthanide elements; x comprises any one or a combination of at least two of F, Cl, Br and I; 0 < = y < = 1. The amorphous rare earth oxyhalide solid electrolyte provided by the invention has relatively high room-temperature ionic conductivity, low electronic conductivity, excellent electrochemical stability and good moisture resistance, and has a relatively great application prospect in lithium batteries.

The invention belongs to the field of organic electroluminescence, and discloses an organic electroluminescence material as well as a preparation method and application thereof. The structure of the organic electroluminescent material is as shown in a chemical formula I: # imgabs0 #. According to the organic electroluminescent material compound provided by the invention, an aryl-substituted dibenzofuran group and a triarylamine group are bridged through a naphthylene group to form a mother nucleus main body, the rigid dibenzofuran structure can effectively enhance the structural stability, and the existence of the triarylamine group can improve the hole transport efficiency of the material; furthermore, the naphthylene group is bridged between the two main body structures, so that a more efficient conjugated system can be formed, the electron mobility of the whole material is improved, and the device has high luminous efficiency and long service life, and can maintain lower driving voltage at the same time.

The invention belongs to the technical field of ammonia synthesis and electro-catalysis, and particularly relates to a preparation method and application of high-entropy alloy aerogel for electro-catalysis. The preparation method comprises the following steps: mixing an inorganic metal salt in a solvent to obtain a precursor solution, quickly adding a reducing agent, standing, and washing and drying the obtained product to obtain the high-entropy alloy aerogel catalyst, the inorganic salt is selected from five or more of copper salt, cobalt salt, iron salt, nickel salt, palladium salt, gold salt, ruthenium salt, platinum salt and silver salt. The three-dimensional continuous porous reticular high-entropy alloy aerogel is obtained through one-step reduction of the inorganic metal salt and standing assembly, the high-entropy alloy aerogel prepared through the method is high in reduction assembly speed, phase separation of multi-component alloy can be effectively inhibited, an amorphous alloy structure is obtained, and therefore when the high-entropy alloy aerogel is applied to ammonia production through electro-catalysis nitrate reduction, the high-entropy alloy aerogel can be used for preparing the high-entropy alloy aerogel. And excellent electrochemical activity and stability can be presented in an ultra-low overpotential range of-0.2 to + 0.2 V vs.RHE.

The invention relates to a double-layer coated silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: adding a porous carbon precursor with a particle size D50 of 5-10 [mu] m into a chemical vapor deposition furnace, and introducing monosilane for 100-800 min for silicon deposition to obtain a silicon-carbon composite material; introducing acetylene gas, and reacting for 50 to 500 minutes to obtain a primary carbon-coated silicon carbon composite material; dissolving lithium nitrate in absolute ethyl alcohol, adding the primary carbon-coated porous silicon-carbon composite material, stirring and dispersing, dropwise adding an ammonium dihydrogen phosphate solution into the solution, and reacting at 60-80 DEG C for 1-3 hours; and carrying out suction filtration, cleaning and drying on the reacted material to obtain the porous silicon-carbon composite material with the double-layer coating structure. Through the double-layer coating structure, the electrochemical stability and mechanical stability of the material are improved, and meanwhile, the application scene of the silicon-carbon negative electrode material at low temperature is expanded.

The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery diaphragm containing modified halloysite nanotubes, a preparation method of the lithium ion battery diaphragm and a lithium ion battery, and the preparation method comprises four steps which are shown in Figure 1 in Figure 1 in Figure 1 in the specification. According to the invention, the sulfonated lithiated halloysite nanotube (sHNT-Li) is introduced into the battery diaphragm, so that the affinity between the diaphragm and an electrolyte is increased, and more sites and channels are provided for lithium ion transmission; and sHNT-Li is utilized to change the diffusion force in the process of a non-solvent phase conversion method, so that the high-temperature-resistant lithium ion battery diaphragm with a microscopic pore channel structure consisting of regular finger-shaped pores and spongy pores is obtained. The diaphragm electrolyte is good in wettability, high in conductivity, good in electrochemical stability and good in lithium dendrite inhibition effect. The battery assembled by the diaphragm shows excellent specific discharge capacity, cycling stability and rate capability, and especially has excellent charge-discharge stability at high temperature; in addition, the electrode polarization degree of the battery is improved.

The invention discloses a sodium ion halide solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of batteries, the sodium ion halide solid electrolyte realizes optimization of a sodium ion transmission path and a microstructure by doping BH4 anions and O anions into a structure and regulating and controlling the doping amount; the sodium ion migration activation energy is reduced, the ionic conductivity of the product is effectively improved, and meanwhile, the product has oxidation resistance and high electrochemical stability and can be compatible with a high-voltage positive electrode material during application.

The invention belongs to the technical field of sodium ion layered oxide positive electrode materials, and relates to a method for reducing residual alkali of a sodium ion battery positive electrode material through weak acid oxide composite coating, which comprises the following steps: 1, uniformly mixing a sodium source, a nickel-iron-manganese precursor, a lithium source and an oxide; 2, calcining the mixture in stages; 3, crushing the primary sintering material, and sieving; 4, uniformly mixing the obtained material with an acidic compound and a metal oxide compound; 5, carrying out secondary sintering on the obtained mixture; and 6, crushing the secondary sintered material, and sieving to obtain the acid / oxide composite coated sodium ion battery layered oxide positive electrode material. According to the invention, a dry mixing process is used, sintering is only needed in an air environment, and compared with a wet coating process, the process is simpler, the cost is lower, and the consumed time is shorter; through composite coating of boric acid and aluminum oxide, multiple effects of reducing residual alkali on the surface and improving the electrochemical performance of the material can be achieved while the structure and morphology of the material are not damaged.

The invention discloses a reflecting device, a reflecting device manufacturing method and a vehicle. The reflecting device comprises a first transparent substrate, a transparent conductive layer, a second transparent substrate, a reflecting layer, a sealant and a dimming composition, the reflecting layer faces the transparent conducting layer; the dimming composition is arranged between the reflecting layer and the transparent conductive layer, the sealant is connected between the first transparent substrate and the second transparent substrate, and a cavity is defined by the sealant, the transparent conductive layer and the reflecting layer; the dimming composition is arranged in the cavity, and the sealant comprises filling particles with the dielectric constant larger than or equal to 20. The breakdown voltage of an electric field formed by the reflecting layer and the transparent conducting layer can be improved, then the electrochemical stability of the filling particles under the action of the electric field can be improved, the reflecting reliability of the reflecting device can be further improved, and the service life of the reflecting device is prolonged.

The invention discloses a low-temperature electrolyte as well as a preparation method and application thereof, belongs to the technical field of battery electrolytes, and solves the problem of non-ideal battery performance in a low-temperature environment due to non-ideal compatibility of linear carboxylic ester and nitrile solvents and graphite in a lithium ion battery electrolyte in the prior art. The low-temperature electrolyte disclosed by the invention comprises the following components: electrolyte solute lithium salt, an organic solvent, an electrolyte additive and 3-fluorotoluene, wherein the organic solvent is a mixture of linear carboxylic ester and nitriles in a volume ratio of 1: (0.25-4). According to the electrolyte provided by the invention, the reversible charge-discharge performance of the lithium ion battery in a low-temperature environment is effectively improved.

The invention discloses a high-compaction-density porous silicon-carbon composite material and a preparation method and application thereof, and the preparation method comprises the following steps: step 1, carrying out dealloying treatment on a micron silicon-based material to obtain a porous silicon skeleton; 2, filling pores, and filling the pores formed by the silicon-based material with a nano silicon material to obtain an intermediate product; and step 3, carrying out carbon coating, forming a carbon coating layer on the surface of the intermediate product by using a carbon material, and sintering to obtain the composite material. The three-dimensional porous silicon skeleton is filled with nano Si, on one hand, the micron porous silicon skeleton can effectively relieve the volume expansion problem caused by insertion and separation of lithium ions (Li < + >) in the charging and discharging process; and on the other hand, the nanometer Si is filled in the micron porous Si framework, so that the compaction density of the negative electrode material can be effectively improved, and the volume energy density is remarkably improved.

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a wide-temperature-range sodium-ion battery electrolyte, a sodium-ion battery and a preparation method of the sodium-ion battery. The wide-temperature-range sodium-ion battery electrolyte comprises a sodium salt, an organic solvent, a first additive and a second additive, the first additive is a benzocrown ether compound as shown in a formula (1) and / or a formula (2); the second additive is a film-forming agent. The key of the invention lies in that the benzocrown ether compound with a specific structure is introduced into the sodium-ion battery electrolyte as an additive, so that anions are promoted to participate in a solvation structure, the migration rate of sodium ions is enhanced, side reaction is inhibited, formation of an SEI film is promoted, the working temperature window (-30-45 DEG C) of the electrolyte is expanded, and the service life of the electrolyte is prolonged. And the sodium ion battery (SIBs) has good electrochemical stability and good cycle performance in a working temperature window, so that the electrochemical performance of the SIBs under all-weather conditions is improved. # imgabs0 #

The invention belongs to the technical field of electrochromic materials, and provides a red-transparent display electrochromic polymer and a preparation method thereof. The method disclosed by the invention comprises the following steps: carrying out ring formation reaction on N-(2, 5-dibromophenyl)-2-ethylhexyl thioamide, potassium ferricyanide and sodium hydroxide to obtain 4, 7-dibromo-2-(heptane-3-yl) benzothiazole; the preparation method comprises the following steps: carrying out substitution reaction on EDOT, n-butyllithium and tributyltin chloride to obtain EDOT-Sn; the preparation method comprises the following steps: carrying out Stille coupling reaction on 2, 4, 7-dibromo-2-(heptane-3-yl) benzothiazole and EDOT-Sn, and then carrying out electrochemical polymerization reaction to obtain the electrochromic polymer. A pure donor (D) type organic molecule is obtained by the method, a corresponding electrochromic film is prepared by electrochemical polymerization, reversible switching between red and transparency is realized, and the electrochromic film has good cycle stability and high color change response speed.

The invention discloses a red phosphorus and graphdiyne composite material as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The preparation method comprises the steps that the carbon paper and the red phosphorus are placed in a vacuum closed reactor to be subjected to heat treatment, in the heat treatment process, the red phosphorus is sublimated and desublimated, and desublimated red phosphorus nanoparticles cover the surface of the carbon paper; carrying out electrochemical deposition on the obtained carbon paper covered with red phosphorus on the surface, so that the surface of the carbon paper is covered with a copper simple substance as a catalyst for graphdiyne growth; and adding the obtained carbon paper into a hexaalkynyl benzene solution, reacting in a dark environment, and washing off unreacted copper elementary substance by using an acidic ferric salt mixed solution to obtain the red phosphorus and graphdiyne composite material. The obtained composite material has wide application prospects in lithium ion batteries and other ion battery negative electrode materials.

The invention relates to a high-entropy iron-manganese-based transition metal layered oxide positive electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries, and the preparation method comprises the following steps: dissolving an iron source, a copper source, a manganese source and a nickel source in an aqueous solution of ethanol and ethylene glycol to form a first solution; dissolving a precipitator in an aqueous solution of methanol and ethanol to form a second solution; heating a methanol solution in an oil bath, dropwise adding the first solution and the second solution, introducing Ar and H2, adjusting the pH value of the solution, reacting, standing and aging, carrying out solid-liquid separation, washing and drying a product, fully mixing and grinding the product with a sodium supplementing agent, titanium dioxide and an organic solvent, heating in Ar and N2, cooling and rapidly grinding to obtain the positive electrode material. The method is simple in process, good in controllability, cheap in raw material and wide in raw material source, the prepared material is uniform in particle size, uniform in distribution and high in crystallinity, the electronic and ionic conductivity of the material is improved, high reversible capacity and excellent cycling stability are obtained, the cost is reduced, and meanwhile the electrochemical performance of the material is improved.

The invention discloses a high-cycle-performance aqueous battery, which comprises an aqueous electrolyte, a negative electrode, a first positive electrode and a second positive electrode, wherein the first positive electrode and the second positive electrode are positioned on two sides of the negative electrode, and a first diaphragm and a second diaphragm are respectively arranged between the first positive electrode and the negative electrode and between the second positive electrode and the negative electrode; the battery is provided with an electromagnetic valve, the electromagnetic valve is electrically connected with the first positive electrode and the second positive electrode to control switching of the positive electrodes in the charging and discharging loop, and every time discharging and charging circulation are completed, the electromagnetic valve switches the electrode connection relation, and the first positive electrode and the second positive electrode are alternately connected into the charging and discharging loop. Switching of the two positive electrodes in the aqueous battery is accurately controlled through the electromagnetic valve, a positive-negative battery structure is formed in real time, the double positive electrodes alternately perform lithium removal-lithium intercalation reaction, excessive Li intercalation or insufficient positive electrode reduction caused by long-term charging and discharging of a single positive electrode is avoided, the structural stability of the positive electrode material is improved, and the service life of the battery is prolonged. The cycle life and the electrochemical performance stability of the aqueous battery are obviously improved.

The invention belongs to the field of batteries, and particularly discloses a polymer electrolyte membrane and a preparation method and application thereof, and the polymer electrolyte membrane comprises a nanofiber membrane, a polymer and electrolyte salt; the polymer and the electrolyte salt are distributed in the nanofiber membrane; the nanofiber membrane comprises polymer fibers and a metal organic framework material loaded with metal single atoms, the metal single atoms are loaded in the metal organic framework material through coordinate bonds, and the metal organic framework material is distributed in the polymer fiber. According to the polymer electrolyte membrane disclosed by the invention, the lithium ion conductivity, the thermal stability and the electrochemical stability at room temperature are remarkably improved by introducing metal single atoms into a metal organic framework material, specifically, the polymer electrolyte membrane still has relatively good stability when the temperature reaches 200 DEG C, an electrochemical stability window is 1-5V, and the electrochemical stability window is 1-5V; and the lithium ion conductivity is up to 1.25 mS cm <-1 >.

The invention belongs to the technical field of preparation of novel electrocatalysts, and particularly relates to preparation and application of an angstrom confinement electrocatalyst for selectively activating molecular oxygen to produce hydroxyl radicals. The preparation method comprises the following steps: taking 2H-phase MoS2 as a precursor, loading metal single atoms on the surface of the precursor, and intercalating alkali metal cations; the angstrom confinement catalyst is 1T-phase MoS2 loaded with metal single atoms. The angstrom confinement catalyst provided by the invention is high in three-electron selectivity, can remarkably expose catalytic active sites, accelerates mass transfer of reactants, generates active oxygen species in a penetrating reactor, realizes high hydroxyl radical generation rate and utilization efficiency in an angstrom channel, is simple in preparation method, and has good electrochemical stability. The method lays a foundation for Angstrom confinement catalysis, and reflects the importance of the Angstrom confinement strategy in the design of a high-efficiency catalyst for water pollution control.

The invention relates to the field of batteries, in particular to a preparation method and application of an iron-cobalt sulfide / nitrogen-doped carbon composite material based on a spray drying method. The method comprises the following steps: mixing a 2-methylimidazole solution and a cobalt salt solution, performing spray drying to obtain purple precursor powder, performing recrystallization and iron ion exchange to obtain Fe / ZIF-67, and finally forming the ZIF-67 skeleton derived iron-cobalt sulfide / nitrogen-doped carbon composite material by a gas-phase vulcanization method. The Fe / ZIF-67 provided by the invention has a nanoscale size and high structural stability. When the iron-cobalt sulfide / nitrogen-doped carbon composite material is used as a sodium-ion battery negative electrode material, a built-in electric field constructed by an iron-cobalt sulfide heterostructure can remarkably improve ion diffusion kinetics; meanwhile, the nitrogen-doped carbon matrix can effectively relieve the volume change of the iron-cobalt sulfide heterojunction in the electrochemical reaction process while improving the conductivity of the composite material, so that the nitrogen-doped carbon matrix shows excellent and stable sodium storage performance.

The invention provides a polymer electrolyte. The polymer electrolyte comprises the following components in percentage by weight: 1 to 90 percent of cross-linked polymer, 0.01 to 50 percent of plastic crystal and 0.01 to 20 percent of lithium salt, the plastic crystal is selected from 1-azabicyclo [2.2. 2] octane and a derivative of 1-azabicyclo [2.2. 2] octane. The invention also provides a preparation method of the polymer electrolyte, a polymer solid-state battery and a preparation method of the polymer solid-state battery. According to the invention, the 1-azabicyclo [2.2. 2] octane and the derivative thereof are used as additives to be added into the polymer electrolyte, on one hand, the 1-azabicyclo [2.2. 2] octane and the derivative thereof can be homogenized with the polymer, so that the growth of lithium dendrites is inhibited, the safety performance of the polymer solid-state battery is greatly improved, and on the other hand, the side reaction between an active substance and an electrode can be reduced; and the short-circuit prevention performance of the battery is improved, so that the safety performance of the battery is further improved.

The invention discloses iridium-cobalt oxide nanoparticles as well as a preparation method and application thereof. The iridium-cobalt oxide nanoparticles comprise a cobaltosic oxide carrier and supported iridium oxide. The preparation method comprises the following steps: 1) preparing an iridium salt-cobalt salt aqueous solution; 2) preparing a reaction solution of a complex containing iridium ammonium salt and cobalt; (3) preparing an iridium hydroxide-cobalt complex compound; and 4) grinding the iridium hydroxide-cobalt complex compound, placing the ground complex compound in an oxygen-containing atmosphere for heat treatment, and then carrying out water washing and drying. The iridium-cobalt oxide nano-particles are low in iridium content, small and uniform in particle size and simple in preparation method, have the advantages of being high in electrochemical activity, good in electrochemical stability and the like when being used as an OER reaction catalyst, and are suitable for large-scale industrial application in the field of hydrogen production through water electrolysis.