150 results about "Lithium nitrate" patented technology

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

The invention relates to an organic eutectic salt modified, regenerated and repaired waste lithium nickel cobalt manganate positive electrode material and a method, and the method comprises the following steps: uniformly mixing the waste lithium nickel cobalt manganate positive electrode material, an aluminum doping source and an organic eutectic salt to obtain mixed powder; the organic eutectic salt is a mixture of lithium hydroxide, lithium nitrate and lithium salicylate; carrying out primary calcination on the mixed powder, cooling, washing and drying to obtain a primary calcined material; and adding a lithium supplement agent into the primary calcined material, uniformly mixing, and carrying out secondary calcination to obtain the regenerated nickel cobalt lithium manganate positive electrode material. According to the method, the characteristics of high lithium ion concentration and low melting point of the organic eutectic salt are utilized, meanwhile, the organic eutectic salt can be used for modifying, regenerating and repairing the waste lithium nickel cobalt manganese oxide positive electrode material under the matching action of the aluminum doping source, and the method is simple, short in process, easy in raw material obtaining and suitable for industrial application; the regeneration effect is excellent, the initial capacity of the regenerated material is high, and the cycling stability is excellent.

The invention relates to the field of lithium metal batteries, and provides a lithium metal battery, a manufacturing method thereof and electric equipment, which are at least beneficial to realizing stable work of a high-voltage lithium metal battery in a wide electrochemical window. The manufacturing method comprises the following steps: forming an initial battery cell; injecting a first electrolyte containing lithium nitrate, a lithium salt and an ether organic solvent into the initial cell; performing a first formation process; injecting a second electrolyte containing fluoroethylene carbonate, a lithium salt, a cyclic phosphazene derivative and a nitrile organic solvent into the initial cell; wherein the structural formula of the cyclic phosphazene derivative is shown in the specification, or R1-R8 are independently selected from alkoxy, cyano-containing alkoxy or fluorine-containing alkoxy, and at least one cyano-containing alkoxy and one alkoxy or fluorine-containing alkoxy exist in R1-R6; and performing a second formation process.

The invention discloses a lithium titanate battery, and relates to the technical field of batteries. The battery comprises a positive electrode, a negative electrode, an electrolyte and a diaphragm, and an addition product synthesized by dimethyl fumarate and benzidine according to a specific molar ratio is added into the electrolyte as a viscosity modifier, so that the viscosity increasing trend of the electrolyte at a low temperature is effectively reduced, and the migration rate of lithium ions is improved. And the electrolyte also comprises a lithium salt, an organic solvent and an auxiliary additive, so that the low-temperature performance and the cycling stability of the battery are favorably optimized. A positive active material is one or more of lithium iron phosphate, lithium manganate, lithium cobalt oxide or nickel manganese cobalt ternary materials, a negative active material is lithium titanate, and additives such as lithium nitrate and fluoroethylene carbonate are further combined, so that the capacity retention ratio and the charge-discharge efficiency of the battery in an extreme low-temperature environment of-40 DEG C are remarkably improved. The lithium titanate battery provided by the invention has excellent low-temperature adaptability, safety and long cycle life, and is applicable to power batteries and energy storage systems in alpine regions.

The invention discloses a lithium ion battery electrolyte and a lithium ion battery. The lithium ion battery electrolyte comprises an organic solvent, a composite lithium salt and an additive, the composite lithium salt comprises lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide and lithium nitrate; the additive comprises a compound 1. By adopting the low-concentration composite lithium salt and the electrolyte containing the compound 1, the oxygenolysis of the electrolyte is inhibited, the solvation energy of solvated lithium ions is reduced, the kinetics of the electrolyte is improved, and the rate discharge, high temperature and cycle performance of the battery are improved.

The invention discloses a novel solvent system-based low-temperature lithium battery electrolyte and a production process, the novel solvent system-based low-temperature lithium battery electrolyte comprises the following components: a carbonic ester solvent, a lithium salt combination and an additive, the carbonic ester solvent comprises ethylene carbonate, fluoroethylene carbonate, 1, 3-dioxolame and ethyl methyl carbonate, and the lithium salt combination comprises a lithium salt combination and an additive; the lithium salt combination is a mixed system of lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate, and the additives are vinylene carbonate, succinonitrile, lithium nitrate, triphenyl phosphate and aluminum trifluoromethanesulfonate; according to the low-temperature lithium battery electrolyte, the performance bottleneck of a traditional electrolyte at the temperature of-40 DEG C to-30 DEG C is broken through through multi-level cooperation of solvent-lithium salt-additive preparation of the low-temperature lithium battery electrolyte, the solvent maintains low viscosity while reducing the freezing point, and low-temperature high dissociation and interface stability are achieved through lithium salt compounding; the compatibility of the solid electrolyte interfacial film structure and current collection is finely regulated and controlled through the additive, and the application requirement in the extremely cold environment is met.

This invention provides a method for preparing a positive electrode lithium supplement, comprising the following steps: Step S1: Mixing and grinding lithium nitrate and lithium hydroxide monohydrate; Step S2: Melting the material after mixing and grinding in Step S1 to obtain a mixed lithium salt of lithium nitrate and lithium hydroxide; Step S3: Mixing the mixed lithium salt with an iron source and glucose, and then pressing it into tablets; Step S4: Calcining the material after tableting in Step S3 under inert gas protection; Step S5: Cooling and sieving the calcined material after Step S4 to obtain the positive electrode lithium supplement Li5FeO4. The method of this invention for preparing Li5FeO4 has excellent properties such as small particle size, low energy consumption, short sintering time, low cost, and low calcination temperature.

The invention provides a lithium metal battery and a manufacturing method thereof, an energy storage system and electric equipment, which are beneficial to improving the performance of the lithium metal battery. The method comprises the following steps: providing a positive plate, a negative current collector and a diaphragm; winding or laminating the positive plate, the negative current collector and the diaphragm, and putting into a shell to form an initial battery cell; a first electrolyte is injected into the initial battery cell, the first electrolyte comprises a lithium salt, lithium nitrate and a solvent, the solvent at least contains 70 wt% or above of a short-chain ether solvent, and the number of carbon atoms of the short-chain ether solvent is smaller than or equal to 6; performing a first formation process on the initial battery cell; a second electrolyte is injected into the initial battery cell in a pulse type liquid injection mode, the second electrolyte comprises a lithium salt, 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether and a solvent, and the molar concentration of the lithium salt in the second electrolyte is larger than that of the lithium salt in the first electrolyte; and performing a second formation process on the initial battery cell to form the lithium metal battery.

This method comprises: mixing a first solution containing a metal nitrate with a second solution containing lithium hydroxide to precipitate a metal hydroxide; thermally decomposing lithium nitrate produced from the metal nitrate and the lithium hydroxide; and recovering lithium oxide contained in the thermal decomposition product of the lithium nitrate. This method may further comprise converting lithium oxide into lithium hydroxide and reusing the lithium hydroxide.

This invention provides a method for preparing a lithium-rich manganese-based cathode material, comprising the following steps: D1: Lithium nitrate, manganese nitrate, nickel nitrate, and cobalt nitrate are dissolved in deionized water at a molar ratio of 1.2:0.54:0.13:0.13 to prepare a metal salt solution. 1.2 Mn 0.54 Ni 0.13 Co 0.13 O2 is co-precipitated with a precipitant and a complexing agent in a solvent to generate a lithium-rich manganese-based core; D2: The lithium-rich manganese-based core is mixed with an interfacial bridging agent in an organic solvent and stirred for 2-4 hours. After drying, an interfacial bridging agent layer is formed on the lithium-rich manganese-based core; D3: The material obtained after step S2 is mixed successively with three metal salt solutions of different concentrations, and different NCM shells are coated on the outside of the interfacial bridging agent layer; D4: After high-temperature sintering, a lithium-rich manganese-based cathode material is obtained. In this invention, the LMRO core, Li2ZrO3 bridging agent, and gradient NCM shell work synergistically to greatly enhance the inhibition of lattice oxygen migration, improve structural stability, and thus significantly improve the first-time efficiency and suppress the cumulative gas release.

Certain aspects of the present disclosure may include a battery including a cathode including a fluorinated carbon material and manganese oxide, an anode including one or more of a lithium metal or a lithium alloy, and a non-aqueous electrolyte including: an organic solvent, one or more lithium salts including lithium perchlorate, and an additive material having lithium nitrate and tris-trimethyl silyl phosphite.

A process and system are disclosed for producing lithium oxide from lithium nitrate. In the process and system, the lithium nitrate is thermally decomposed in a manner such that a fraction of the lithium nitrate forms lithium oxide, and such that a remaining fraction of the lithium nitrate does not decompose to lithium oxide. The thermal decomposition may be terminated after a determined time period to ensure that there is a remaining fraction of lithium nitrate and to thereby produce a lithium oxide in lithium nitrate product. The lithium oxide in lithium nitrate product may have one or more transition-metal oxides, hydroxides, carbonates or nitrates added thereto to form a battery electrode. The lithium oxide in lithium nitrate product may alternatively be subjected to carbothermal reduction to produce lithium metal.

In order to improve the circulation and high-temperature storage performance of a silicon-based battery, the lithium ion battery comprises a positive electrode, a negative electrode and an electrolyte, the negative electrode comprises a negative electrode active material layer, the negative electrode active material layer comprises a negative electrode active material, the negative electrode active material comprises pure silicon particles, the electrolyte comprises a lithium salt and an impregnating compound, and the impregnating compound comprises a lithium ion battery positive electrode and a lithium ion battery negative electrode. The lithium salt comprises lithium nitrate and lithium bis (fluorosulfonyl) imide; the mass percentage content of the impregnating compound in the electrolyte is A%; the mass percentage content of the lithium nitrate in the electrolyte is B%; the mass percentage content of the lithium bis (fluorosulfonyl) imide in the electrolyte is C%; the Lc thickness of the pure silicon particles is Hnm, and the Lc thickness is the crystallite size, obtained through X-ray diffraction, of the pure silicon particles in the c-axis direction; the lithium ion battery meets the formula 1: 0.009 < = (B / C) * A / H < = 0.667, so as to improve the cycle and high-temperature storage flatulence of the silicon-based battery.

The present invention relates to an electrolyte for a lithium-sulfur battery, and a lithium-sulfur battery comprising the same, the electrolyte comprising: a first solvent comprising a heterocyclic compound comprising at least one double bond and simultaneously comprising an oxygen atom or a sulfur atom; a second solvent comprising at least one of an ether-based compound, an ester-based compound, an amide-based compound, and a carbonate-based compound; a lithium salt; lithium nitrate; and a borate-based lithium salt.

The invention relates to a novel lithium metal battery ether electrolyte and a preparation method thereof, the electrolyte comprises the following components: a non-aqueous organic solvent system, a lithium salt and an additive, the non-aqueous organic solvent system is preferably selected from ethylene glycol dimethyl ether and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether; the additive is preferably selected from lithium nitrate, lithium difluoro (oxalato) borate, tris (pentafluorophenyl) borane and pentafluorophenoxy cyclotriphosphazene; the lithium salt comprises at least one of lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethylsulfonyl) imide, lithium difluoro (oxalato) borate, lithium hexafluorophosphate and lithium tetrafluoroborate; the invention also provides a preparation method of the electrolyte and a battery formed by the electrolyte. The electrolyte provided by the invention realizes low impedance, high conductivity and long cycle life while maintaining high energy density, and provides an effective solution for safe and reliable operation of a metal lithium battery under harsh working conditions of high surface capacity, high current density and the like.

The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to high-voltage electrolyte for a fast-charging lithium ion battery as well as a preparation method and application of the high-voltage electrolyte. Comprising the following substances: a main solvent, which comprises diethyl carbonate (DEC), dimethyl carbonate (DMC) and ethylene carbonate (EC); the diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (HFE), and the diluent is 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether (HFE); lithium hexafluorophosphate (LiPF6); the film-forming additive is LiDFOB lithium difluoro (oxalato) borate; a film forming additive tri (trimethylsilyl) phosphate TMSP; and lithium nitrate LiNO3. The method provided by the invention is simple and easy to implement and low in cost, and the obtained electrolyte shows excellent specific capacity, charge-discharge cycle stability and rate capability as an electrode material of a lithium ion battery and a sodium ion battery.

The present invention provides a multi-level porous micro-nanostructured lithium-rich manganese-based positive electrode material and a preparation method thereof. First, lithium nitrate, manganese nitrate, cobalt nitrate, nickel nitrate, organic fuel, and organic carbon source are dissolved in deionized water to obtain a uniform mixed solution. Then, the mixed solution is atomized to form carbon-containing droplets. Nitrogen is used as a protective gas and a carrier gas to cause the carbon-containing droplets to undergo a self-propagating combustion reaction at a certain ignition temperature to obtain a combustion product powder; the combustion product is placed in a crucible and calcined in an inert atmosphere to obtain a calcined powder; the calcined powder is placed in a crucible and calcined in an air atmosphere to remove carbon; the calcined product is fully ground to obtain a multi-level porous micro-nanostructured lithium-rich manganese-based positive electrode powder. The present invention obtains a multi-level porous micro-nanostructured lithium-rich manganese-based positive electrode material with both micropores and mesopores, which can effectively prolong the cycle stability of the lithium-rich manganese-based positive electrode material. The present invention has a simple process, low energy consumption, low price, high capacity retention rate, and good industrial application prospects.

The present application relates to a kind of high-pressure-resistant gel electrolyte stable to lithium negative electrode and preparation method thereof, belong to gel polymer electrolyte technical field.The electrolyte is composed of PVDF-HFP film and electrolyte;The electrolyte is composed of lithium salt I, ester organic solvent, ether organic solvent and lithium salt II;The ester organic solvent is composed of DEC and FEC or is composed of EMC and FEC;The ether organic solvent is 18-crown ether-6, 15-crown ether-5 or 12-crown ether-4;The lithium salt II is lithium nitrate, and lithium salt I is different from lithium salt II.Ether organic solvent and lithium salt II are added to the mixed solution composed of lithium salt I and ester organic solvent, and electrolyte is obtained by heating and stirring, the electrolyte is obtained by soaking PVDF-HFP film in electrolyte, and the interface compatibility of the electrolyte with high-nickel positive electrode and lithium negative electrode is good, can inhibit lithium dendrite growth, and improve the cycle performance of battery.

A lithium secondary battery according to the present disclosure includes: a cathode which includes a cathode active material layer including a lithium transition metal oxide; an anode disposed opposite to the cathode and including an anode active material layer, and an electrolyte which includes a lithium salt, a solvent including a carbonate solvent and an ether solvent, and lithium nitrate (LiNO3). In the electrolyte, a lithium nitrate dissolution ratio, defined by Equation 1, in the electrolyte is 0.01 to 0.07.

Provided is a separator used for a secondary battery. The separator may comprises a complex-containing layer which is provided on a surface in contact with a negative electrode of the secondary battery and which contains an electrolyte complex. The electrolyte complex may contain a nitrate and a coordination substance. The nitrate may include at least one selected from lithium nitrate, potassium nitrate, cesium nitrate, sodium nitrate, silver nitrate, calcium nitrate, zinc nitrate, copper nitrate, magnesium nitrate, indium nitrate, aluminum nitrate, ammonium nitrate, barium nitrate, and iron nitrate.

The invention provides a lithium metal battery and a manufacturing method thereof, an energy storage system and electric equipment, which are at least beneficial to improving the performance of the lithium metal battery. The manufacturing method comprises the following steps: providing a positive plate, a negative current collector and a diaphragm; winding or laminating the positive plate, the negative current collector and the diaphragm, and putting into a shell to form an initial battery cell; injecting a first electrolyte into the initial cell at a first temperature, wherein the first electrolyte comprises a lithium salt, lithium nitrate and an ether solvent; performing a first formation process on the initial battery cell; after the temperature of the initial battery cell is increased from the first temperature to a second temperature, a second electrolyte is injected into the initial battery cell, the second electrolyte comprises a lithium salt, a silicon bridging compound, a fluorine-containing film-forming additive and a nitrile solvent, and the structural formula of the silicon bridging compound is shown in the specification; and performing a second formation process on the initial battery cell.

The invention belongs to the field of lithium batteries, and particularly relates to a sulfonic acid-based deep eutectic gel electrolyte and a preparation method and application thereof, the electrolyte comprises a eutectic electrolyte and a polymer monomer; the eutectic electrolyte comprises a hydrogen bond donor and a hydrogen bond acceptor, the hydrogen bond donor is a sulfonic acid substance, and the hydrogen bond acceptor is a lithium salt; the molar ratio of the sulfonic acid substance to the lithium salt is (4-2): 1; the eutectic electrolyte further comprises an additive, and the additive is one or more of vinylene carbonate, fluoroethylene carbonate and lithium nitrate; the polymer monomer is a cyclic ether substance; the polymer monomer further comprises a cross-linking agent, DOL polymerization is initiated by using lithium salt anions as an initiator through an in-situ polymerization process, an initiator with high reaction activity does not need to be additionally added, the preparation operation steps are greatly simplified, and meanwhile, the production link and the material cost are further reduced through the design of the in-situ polymerization sulfonic acid group deep eutectic electrolyte. And the preparation targets of low cost and easy large-scale preparation are achieved.

The present application belongs to the technical field of lithium nitrate solution aluminum-lithium separation, and specifically relates to a method for self-adsorption separation and recycling of aluminum nitrate solution containing trace lithium, which comprises the following steps: S1: treating lithium ore or nitric acid leaching solution containing lithium waste by using a nanofiltration membrane to obtain monovalent ion solution mainly containing lithium nitrate and non-mono-valent ion solution mainly containing aluminum nitrate; S2: using the monovalent ion solution obtained in S1 to prepare battery-grade lithium carbonate after purification and impurity removal; S3: adding magnesium oxide or magnesium carbonate to the non-mono-valent ion solution obtained in S1 to adjust the pH to 2-3.4, and the reaction temperature is 40-100 DEG C; S4: washing the Al(OH)3 precipitate obtained in S3 with water to obtain a mixture containing Li + solution and crude Al(OH)3; and subsequent treatment. The present application has the advantages of simple process, low processing cost, high lithium metal recovery rate, green and environmentally-friendly process, good economic benefits, and easy industrialization application.

Certain aspects of the present disclosure may include a battery including a cathode including a fluorinated carbon material and manganese oxide, an anode including one or more of a lithium metal or a lithium alloy, and a non-aqueous electrolyte including: an organic solvent, one or more lithium salts including lithium perchlorate, and an additive material having lithium nitrate and tris-trimethyl silyl phosphite.

The invention relates to a low-damage corrosion-resistant aluminum oxide polishing solution for an optical device and a preparation method of the low-damage corrosion-resistant aluminum oxide polishing solution, and belongs to the technical field of precise polishing. The polishing solution comprises 1-10wt% of modified alpha-phase aluminum oxide nanoparticles which are subjected to double modification by a silane coupling agent and carboxylic acid grafting; 0.1-5 wt% of a dispersant, wherein the dispersant is at least one of sodium polyacrylate, ammonium polyacrylate and sodium citrate; 0.01-1.5 wt% of a corrosion inhibitor, wherein the corrosion inhibitor is at least one of benzotriazole, phytic acid and sodium silicate; 0.05 to 2 wt% of a nonionic surfactant; the pH regulator is used for regulating the pH value of the system to 8-10; 1-8.5 wt% of a functional additive, wherein the functional additive is a compound composed of zinc sulfate, lithium nitrate and cerous nitrate; and the balance deionized water. According to the invention, the silane coupling agent and carboxylic acid grafted dual-modified aluminum oxide abrasive material is adopted, so that mechanical scratches on the surface of an optical device can be reduced.

A process and system are disclosed for producing lithium oxide from lithium nitrate. In the process and system, the lithium nitrate is thermally decomposed in a manner such that a fraction of the lithium nitrate forms lithium oxide, and such that a remaining fraction of the lithium nitrate does not decompose to lithium oxide. The thermal decomposition may be terminated after a determined time period to ensure that there is a remaining fraction of lithium nitrate and to thereby produce a lithium oxide in lithium nitrate product. The lithium oxide in lithium nitrate product may have one or more transition-metal oxides, hydroxides, carbonates or nitrates added thereto to form a battery electrode. The lithium oxide in lithium nitrate product may alternatively be subjected to carbothennal reduction to produce lithium metal.

The invention belongs to the technical field of batteries, and particularly relates to a lithium ion battery positive plate capable of releasing lithium nitrate, a diaphragm-free lithium ion battery and a preparation method. The surface of the positive plate of the lithium ion battery is coated with a hollow mesoporous silica insulating coating capable of releasing lithium nitrate, so that the battery completely abandons a traditional polyolefin diaphragm. The coating can store lithium nitrate by utilizing a hollow cavity of the hollow mesoporous silica while realizing physical isolation of the electrode, and a lithium nitrate additive is released by virtue of a mesoporous channel, so that the cycling stability of the battery is improved. According to the invention, the hollow mesoporous silica capable of releasing lithium nitrate is prepared into the self-supporting functional coating by using the flexible bonding effect of the binder. According to the structure, the thermal stability of the battery is remarkably improved, and the risk of high-temperature thermal shrinkage short circuit is reduced. Lithium nitrate in the hollow mesoporous silica is released into the electrolyte and participates in forming a nitrate-containing and high-strength solid electrolyte interface film or a positive electrode electrolyte interface film, so that the cycle life is prolonged.

The present invention relates to an electrolyte comprising a phosphotriester solvent for recycling a lithium ion battery and a battery comprising the electrolyte. An electrolyte for a circulating lithium ion battery includes an organic solvent and a lithium salt in the organic solvent. The organic solvent includes a primary solvent component and a secondary solvent component. The primary solvent component includes a phosphotriester having the formula R1O-P (= O) (OR2) (OR3), wherein R1, R2 and R3 are each independently a fluorinated or non-fluorinated organic group selected from the group consisting of hydrocarbyl, heterohydrocarbyl, silyl, siloxy, alkoxysilyl, cyano and alkylcyano. And the lithium salt comprises lithium nitrate (LiNO3). The lithium nitrate is present in the organic solvent at a concentration of 0.5 mol / L or more and 4 mol / L or less. The electrolyte is configured to provide a medium for conducting lithium ions between a negative electrode comprising a lithium-based electroactive negative electrode material and a positive electrode comprising an olivine-type lithium transition metal oxide.

The present invention discloses a high-conductivity composite coating diaphragm, its preparation method, and application. The high-conductivity composite coating diaphragm comprises: a base film and a coating coated on the base film. The coating comprises: poly(p-phenylene terephthalamide), lithium aluminum titanium phosphate, aluminum nitride, and a first substance, the first substance being one or a mixture of lithium nitrate, sodium dodecylbenzenesulfonate, an organic nitrate, and isosorbide dinitrate. The present invention improves the transport of lithium ions in the coating diaphragm by introducing aluminum nitride, thereby improving the ionic conductivity of the coating diaphragm. The introduction of PPTA further enhances the heat resistance and adhesion of the coating diaphragm. The introduction of LATP provides the coating diaphragm with good porosity, thermal stability, and liquid absorption rate. The first substance is introduced as a dispersant for LATP, improving its dispersibility. Furthermore, the inclusion of lithium in the first substance replenishes lithium in the diaphragm, synergizing with aluminum nitride to enhance the ionic conductivity of the diaphragm.

The invention discloses a fused salt heat storage material based on a lithium nitrate and polyvinylidene fluoride hybridized zeolite imidazate framework structure. The fused salt heat storage material comprises the following components in parts by mass: 20-35 parts of sodium nitrate, 25-40 parts of potassium nitrate, 10-20 parts of lithium nitrate, 10-25 parts of calcium nitrate and 0.5-2 parts of a polyvinylidene fluoride hybridized zeolite imidazate framework structure material, the polyvinylidene fluoride hybridized zeolite imidazate skeleton structure material is prepared by the following steps: step 1, adding a zinc nitrate solution into a 2-methylimidazole solution under a stirring condition, standing, carrying out a crystallization reaction, washing and drying to obtain a zeolite imidazate skeleton structure material; and step 2, mixing the zeolite imidazate skeleton structure material, polyvinylidene fluoride and dimethylformamide, and drying to obtain the polyvinylidene fluoride hybridized zeolite imidazate skeleton structure material. The fused salt heat storage material is high in specific heat capacity and low in viscosity.