89results about How to "Good low temperature" patented technology

The invention belongs to the technical field of hydraulic oil, and particularly discloses super-lubricity energy-saving anti-wear hydraulic oil and a preparation method thereof. The super-lubricity energy-saving anti-wear hydraulic oil is prepared from the following components in parts by weight: 75 to 90 parts of composite base oil, 5 to 7 parts of viscosity index improver, 3 to 5 parts of friction improver, 1 to 3 parts of pour point depressant, 0.005 to 2 parts of anti-rust preservative, 0.003 to 0.02 part of demulsifying agent, 0.01 to 0.03 part of anti-foaming agent, 0.05 to 1 part of clearing agent, 0.05 to 2 parts of antioxidant and 0.05 to 1.5 parts of metal deactivator, the composite base oil is composed of coal base oil, second-class base oil and alkyl naphthalene base oil according to the mass ratio of 5: 4: 1. The super-lubricity energy-saving anti-wear hydraulic oil provided by the invention is high in viscosity index, excellent in shear stability, excellent in oxidation stability, excellent in low-temperature performance and small in friction coefficient, the service life of a product is greatly prolonged, the super-lubricity energy-saving and environment-friendly performance requirements are met, and the super-lubricity energy-saving anti-wear hydraulic oil has a wide application prospect.

The invention provides a preparation method of coaxial aerogel fiber and temperature self-adaptive protective aerogel fabric, which comprises the following steps: weighing nano-crystalline cellulose powder and dispersing in deionized water to obtain nano-crystalline cellulose dispersion suspension, weighing phase change microcapsules and dispersing in the nano-crystalline cellulose dispersion suspension to obtain phase change microcapsules; a core layer spinning mixed solution is obtained; carrying out wet spinning on the nano aramid fiber spinning stock solution and the core layer spinning mixed solution through a coaxial spinning needle, and fully solidifying in a coagulating bath to obtain coaxial gel fibers; the coaxial gel fibers are subjected to multiple times of solvent replacement treatment, then washed to be neutral and finally subjected to freeze drying treatment, and the coaxial aerogel fibers are obtained. According to the fabric, the phase change microcapsules are perfectly wrapped in the aerogel fibers, and the fabric has good heat insulation performance, good mechanical performance, excellent low-temperature and high-temperature responsiveness and a good protection effect in an extreme environment.

The EPDM composition is a rubber composition obtained by blending carbon black, a plasticizer and a cross-linking agent in an ethylene-propylene-diene ternary copolymer rubber, the plasticizer is a polyol ester, the polyol ester is a reaction product of a neopentyl polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5-22 wt%. The EPDM composition does not damage the mixing property and the processability, and the hardness change of the obtained cross-linked product after a thermal aging test is the same as that of the cross-linked product under the condition of matching the same parts of alpha-olefin oligomer, and is greatly improved compared with that of the cross-linked product under the condition of matching aliphatic dibasic acid ester.

The invention provides a high-oil-resistance wide-temperature-range fluorosilicone rubber composite material, a preparation method and application, and belongs to the technical field of high polymer materials and silicone rubber. The sealing material is prepared through high-temperature and high-pressure vulcanization by uniformly dispersing and interacting the components mainly through a mechanical blending method. The prepared fluorosilicone rubber composite material has relatively high hardness and modulus, and shows relatively low compression set rate. The polar oil resistance of the material is evaluated through test oil conforming to the AMS3021 standard, the result shows that the oil-resistant sealing performance of the material is excellent, and the material has a good application prospect in a combined sealing structure.

The invention discloses a non-selective sodium-ion battery electrolyte suitable for low temperature and a preparation method thereof, and relates to the field of batteries, and the sodium-ion battery electrolyte is composed of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, vinylene carbonate and sodium hexafluorophosphate. The sodium ion battery low-temperature electrolyte with uniform components is obtained by regulating and controlling the proportion of the basic components and mixing the basic components with the additive with proper content, the freezing point of the electrolyte is reduced, the capacity retention ratio of the battery at low temperature is improved, and a new thought is expected to be provided for widening the low-temperature application scene of the sodium ion battery.

The invention provides a synthetic lubricating oil composition and application thereof, and belongs to the technical field of lubricating oil. The synthetic lubricating oil composition comprises base oil, a pour point depressant and a composite additive, the base oil comprises synthetic ester base oil; the synthetic ester base oil consists of low-viscosity synthetic ester and high-viscosity synthetic ester. The composition has ultrahigh viscosity index and low-temperature performance, is diesel engine lubricating oil with very excellent low-temperature performance, passes a graphite flake friction characteristic test and a THOT oxidation test required by TES 439 specifications, and can meet the lubrication requirements of an engine and a transmission system.

The invention belongs to the technical field of coated paper, and particularly discloses coated paper capable of being used by microwaves and a paper container. The coated paper capable of being used by microwaves comprises paper and a coated layer, and the coated layer is prepared from the following raw materials in parts by weight: 100 to 110 parts of polylactic acid, 50 to 60 parts of degradable toughening resin, 20 to 25 parts of modified talcum powder, 15 to 18 parts of modified chitosan fiber, 3 to 5 parts of maleic anhydride grafted polypropylene, 1 to 2 parts of antioxidant, 2 to 3 parts of anti-ultraviolet agent and 4 to 5 parts of pentaerythritol stearate. The microwavable coated paper prepared in the invention has good high and low temperature resistance, strength and heat sealability, and the mechanical properties, cohesiveness and heat stability of the coated layer are improved through cooperation of the raw material components.

The invention discloses a water-based polymer emulsion stabilized fiber aeolian sand macadam base material and a preparation method, and belongs to the technical field of pavement building materials, the water-based polymer emulsion stabilized fiber aeolian sand macadam base material comprises a base material, a water-based polymer and basalt fiber; the base material comprises the following components in percentage by mass: 60-70% of graded broken stone; 30% to 40% of aeolian sand; by taking the mass of the base material as a standard, the coating also comprises 0.4-1% of water-based polymer emulsion; 1%-2% of basalt fiber; the water-based polymer emulsion stabilized fiber aeolian sand macadam base material has good mechanical properties, stability and durability, solves the problems of reflection cracks, ruts and other diseases of a traditional semi-rigid base, and prolongs the service life of a pavement.

The utility model relates to battery liquid cooling technical field, concretely refers to a kind of liquid-cooled battery PACK, including PACK battery shell and the butt joint top cover of movable sleeve connection on the PACK battery shell top outside surface, the butt joint base of movable sleeve connection on the PACK battery shell inner side wall surface, battery pack of movable sleeve connection on the butt joint base inner side wall surface and the butt joint top cover top inner side wall surface, the inner side wall surface of PACK battery shell is provided with the inner container sleeve shell of movable sleeve connection on the butt joint base and battery pack outside surface.Simultaneously cooperate the low-temperature cooling water inside the water guide cavity between PACK battery shell and inner container sleeve shell to carry out cooling treatment to the inner side wall surface of inner container sleeve shell, so that the inner side wall surface of inner container sleeve shell is in low-temperature state, and the low-temperature cooling water inside water guide cavity will be through and communicate with the hollow water guide pipe inside water guide cavity inside to make cooling water enter the inside of hollow water guide pipe.

The invention discloses a sodium-ion battery negative electrode material as well as a preparation method and application thereof, belongs to the technical field of sodium-ion batteries, and solves the problem of poor universality of a sodium-ion battery negative electrode material modification method in the prior art. The preparation method comprises the following steps: carrying out surface rich oxidation treatment on a carbon negative electrode; carrying out two-step thermal reaction in an inert atmosphere; wherein in the first step, nitrogen / sulfur-containing small molecules are used for heteroatom doping; and 2, carrying out calcination treatment to remove heteroatoms, and naturally cooling to 25-30 DEG C to obtain the surface topological defect modified carbon negative electrode material. And physically mixing the surface topological defect modified carbon negative electrode material with the active heteroatom-containing small molecules, and carrying out heat treatment in an inert atmosphere to obtain the sodium ion battery negative electrode material. According to the negative electrode material prepared by the preparation method provided by the invention, the performance of the sodium-ion battery, especially the rate capability, the high-activity substance loading capacity and the low-temperature capacity, is remarkably improved.

The invention discloses a coating for an isolating layer of a modified asphalt waterproof coiled material, a preparation method and application of the coating, a composite waterproof coiled material and a preparation method of the composite waterproof coiled material. The coating is prepared from the following raw materials: emulsified asphalt, water, an emulsion, an anti-sticking agent, a pH regulator, a defoaming agent, a stabilizer, a curing agent, titanium dioxide and filler. According to the invention, the anti-sticking coating is prepared on the surface of the modified asphalt layer to replace a traditional isolation material, and the coating can be completely stuck with the modified asphalt coating and can also be compounded with a polymer coating and a polyurethane coating for use; in addition, the coating for the isolating layer also has good low-temperature performance.

The present invention provides a novel cobalt-free positive electrode material and a preparation method thereof. The chemical formula of the cobalt-free positive electrode material is Li m Ni x Fe y Al z M (1‑x‑y‑z) O2·nB2O3, wherein M is one or more elements selected from W, Ta, Ti, Si, Mg, Ca, Sr, Ba, Ra, Sc, Y, Zr, Nb, Hf, Cr and Mo, 0.95≤m≤2, 0.05≤x≤0.9, 0.05≤y≤0.9, 0.02≤z≤0.3, 0≤n≤0.005. The cobalt-free positive electrode material of the present invention has the advantages of low raw material cost, simple preparation process, good repeatability, easy mass production, relatively friendly to the environment, etc., and the discharge platform voltage is higher than that of lithium iron phosphate positive electrode material.

The utility model provides an aluminum foil glass steel plate for a breeding guide plate, which comprises an extension plate arranged on one side of the aluminum foil steel plate, a splicing mechanism is arranged on one side of the top of the aluminum foil steel plate, and a waterproof lantern ring is arranged on the top of the extension plate. The waterproof lantern ring is arranged on the outer side of the splicing mechanism in a sleeving mode, the splicing mechanism is used for rapidly splicing a plurality of aluminum foil steel plates and improving the splicing efficiency of the aluminum foil steel plates, PET film layers are arranged in the aluminum foil steel plates, glass fiber layers are arranged at the bottoms of the PET film layers, and unsaturated polyester resin layers are arranged at the bottoms of the glass fiber layers. According to the aluminum foil glass steel plate for the breeding guide plate, the splicing convenience of the aluminum foil glass steel plate is improved, and the problems that the plate is punched and fixed through bolts, the overall structure of the plate is easily damaged by punching, and the heat resistance, corrosion resistance and the like of the plate are reduced are avoided.

The invention discloses a transmission type radiation intelligent building film. The building film sequentially comprises a release film, a bonding layer, a one-way perspective functional layer and an infrared radiation base layer. The invention further discloses a preparation method of the transmission type radiation intelligent building membrane. According to the building film, by arranging the release film and the bonding layer, when the building film is specifically used, the release film is torn off, and the building film can be directly bonded to a corresponding scene through the bonding layer, so that the building film is convenient and practical; besides, by arranging the one-way perspective function layer composed of the metal layer and the metal compound layer, the building film has low internal reflectivity, the transmission film has excellent privacy, and indoor privacy can be protected; through the arrangement of the infrared radiation base layer, the building film not only has excellent heat insulation performance, but also has the effects of excellent infrared radiation blocking thermal efficiency and the like; in conclusion, the building film not only has excellent heat insulation performance, but also has the excellent effects of high privacy, low light reflection, external adhesion and the like.

This invention discloses a battery output circuit with uninterrupted low power consumption, high efficiency, and boost voltage regulation, comprising: a battery; diode one, the anode of which is connected to the positive terminal of the battery; a boost chip, pin 1 of which is connected to the positive terminal of the battery; diode two, the anode of which is connected to pin 2 of the boost chip; a load, pin 1 of which is connected to the cathodes of diodes one and two, pin 3 of which is connected to pin 4 of the boost chip; and pin 2 of the load, pin 3 of the boost chip, and the negative terminal of the battery grounded. Under normal load operation, when the boost chip is turned on, the input voltage of the load will not decrease with the increase of the operating current, effectively solving the defect of battery voltage fluctuation with changes in output current, especially at low temperatures. The boost chip is not always on during system operation, effectively improving its lifespan.

This invention relates to the field of sodium-ion battery technology, specifically to a rapid screening method for low-temperature sodium-ion batteries and its application. The method involves assembling positive electrode, negative electrode, separator, and electrolyte into different sodium-ion batteries, followed by charging and formation. Q-V data for each sodium-ion battery during the formation process are obtained, and dQ / dV-V curves are plotted to determine the peak position and area of ​​the redox peak. After formation, the sodium-ion batteries undergo aging and capacity testing to obtain finished sodium-ion batteries. Under low-temperature conditions, the finished sodium-ion batteries are subjected to DCR testing to obtain their low-temperature DCR resistance. Based on the peak position and area of ​​the redox peak and the low-temperature DCR resistance, the low-temperature performance of different sodium-ion batteries is determined. This method can quickly and accurately screen sodium-ion battery systems with relatively superior low-temperature performance, shortening the cell low-temperature performance testing cycle and improving the screening efficiency of low-temperature sodium-ion batteries.

The invention relates to a synthetic method of tetrafluoroethylene-propylene rubber, the tetrafluoroethylene-propylene rubber and a composition thereof, the synthetic method of the tetrafluoroethylene-propylene rubber comprises the following steps: taking mixed monomers of tetrafluoroethylene and propylene monomers as raw materials, and preparing the tetrafluoroethylene-propylene rubber through an emulsion polymerization method. Water is adopted as a medium for reaction, the tetrafluoroethylene-propylene rubber with excellent low-temperature performance can be obtained under the condition that the low-cost unsaturated silane comonomer is added, the raw material cost is saved, and the operation is simple.

The invention discloses a low-temperature lithium iron phosphate positive electrode material and a preparation method and a battery thereof, belonging to the field of battery technology, including: preparing a lithium iron phosphate precursor with anhydrous iron phosphate, lithium carbonate and an organic carbon source as raw materials; adding ethylenediaminetetraacetic acid and ammonia water to deionized water, stirring evenly, then adding zinc acetate, cerium oxide and polyvinyl pyrrolidone, ultrasonic treatment, concentration and drying, grinding the obtained product and heat treating it to obtain an additive; mixing the lithium iron phosphate precursor and the inorganic carbon source and ball milling, then adding the additive, continuing ball milling, drying and sintering to obtain a low-temperature lithium iron phosphate positive electrode material. The preparation method of the present invention can improve the lithium ion diffusion rate and electronic conductivity of the lithium iron phosphate positive electrode material, effectively improve the electrochemical performance of the lithium iron phosphate positive electrode material at low temperature, and the prepared low-temperature lithium iron phosphate positive electrode material has a discharge capacity of more than 166mAh / g at 25°C and 0.2C, and a 0.2C discharge capacity retention rate of more than 85% at -20°C.

This invention discloses a composite expander and its application in the negative electrode plate of a lead-acid battery, belonging to the field of lead-acid battery technology. Ammonium persulfate is used as an oxidant, added to an ethanol solution mixture of pyrrole / aniline monomers (conductive monomers), sodium lignosulfonate, and acrylamide, causing an oxidation reaction. Subsequently, it is calcined at high temperature under a nitrogen or argon atmosphere to obtain a compound in which a composite polymer encapsulates sodium lignosulfonate. After calcination under a protective gas atmosphere, some of the composite material carbonizes, forming a carbon-encapsulated sodium lignosulfonate composite expander. The carbon-encapsulated composite expander can slow down the consumption of sodium lignosulfonate. Using the composite expander results in a higher hydrogen evolution overpotential and more durable low-temperature performance. The application of the composite expander in the negative electrode plate of a lead-acid battery improves the sulfation problem of the negative electrode plate operating under high efficiency partial charge conditions, extending the cycle life of the lead-acid battery.

The present invention relates to the field of electrochemical technology, and specifically discloses a secondary battery and an electrical device. The secondary battery of the present invention comprises a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, wherein the positive electrode active material in the positive electrode sheet comprises a lithium-containing material with an olivine structure; the secondary battery is subjected to a charge and discharge test at 25°C and 0.33C in a voltage range of 2.5 to 4.25V to obtain a discharge curve; the discharge curve comprises three discharge platforms with different potentials, which are recorded as the first discharge platform, the second discharge platform and the third discharge platform in order from high to low potential; the potential difference between the second discharge platform and the third discharge platform is 23 to 192mV; the discharge capacity of the third discharge platform accounts for 3.5 to 88% of the total discharge capacity of the secondary battery. The secondary battery of the present invention has a high discharge power at low temperature and low SOC and good energy density.

The invention relates to the technical field of negative electrode additives for energy storage batteries, and in particular to a negative electrode additive for a high temperature resistant energy storage battery. The additive comprises the following raw materials by weight: 0.8-1.25 parts of barium sulfate, 0.15-0.35 parts of carbon black, 0.1-0.3 parts of sodium lignin sulfonate, 0.2-0.4 parts of humic acid, 0.01-0.05 parts of sodium polyacrylate, and 0.05-0.15 parts of a block copolymer. The invention uses barium sulfate, carbon black, sodium lignin sulfonate, humic acid, sodium polyacrylate and a block copolymer of sodium polypropylene sulfonate to form a composite additive for the negative electrode of a lead-acid battery. The composite additive used in the invention is matched with sodium polyacrylate with high hydrophilicity under the existing additive system to form a gel area on the surface of lead, has high "liquid retention" ability in both high temperature and severe cold climates, improves ion diffusion rate, balances changes in local electrolyte density, and can provide a function of capturing metal ions.

The present invention discloses a landfill covering system, including an impermeable layer, a pest trapping layer, a garbage layer, a clay layer and nutrient soil arranged in sequence from bottom to top, the pest trapping layer including an insect trapping pipe and an insecticidal pipe, the insecticidal pipe is provided with an insect trapping mechanism and an insecticidal mechanism inside, the insecticidal mechanism including an insect trapping gas storage box fixedly connected to the top of the insecticidal pipe, the insecticidal pipe is fixedly connected with a hair dryer inside, the air inlet of the hair dryer is communicated with the insect trapping gas storage box through a pipe, and the air outlet of the hair dryer is communicated with the insect trapping pipe through a pipe. The present invention provides a pest trapping layer, and during trapping, trapping and killing work is performed by first discharging trapping gas and then discharging insecticidal liquid, which can kill pests in garbage to a great extent, and prevent pests from damaging the landfill system, thereby achieving the purpose of continuously killing pests after landfilling.

The invention relates to the field of low-temperature mobile power supplies, and discloses a battery cell and a preparation method thereof, and a soft package lithium ion battery and application thereof. The battery cell comprises a positive plate, a negative plate, a diaphragm and an electrolyte, wherein the positive plate comprises modified nickel cobalt lithium manganate, and the modified nickel cobalt lithium manganate comprises core-shell type nickel cobalt lithium manganate and a boron-containing compound coating the surface of the core-shell type nickel cobalt lithium manganate; wherein the content of a nickel element in the core-shell type nickel cobalt lithium manganate is gradually reduced from inside to outside, the content of a cobalt element is uniformly distributed from inside to outside, and the content of a manganese element is gradually increased from inside to outside; the negative plate comprises a nanometer silicon-based negative electrode material, and the nanometer silicon-based negative electrode material is a mixture of a silica material and graphite. The soft package lithium ion battery prepared from the battery cell has relatively good low-temperature performance and safety performance.

The invention discloses a reactive cationic asphalt emulsifier and a preparation method and application thereof, and belongs to the technical field of road engineering materials, the emulsifier has a [A]-[B]-[C] three-section structure, [A] is an epoxy chain segment, [B] is a polyether chain segment (which is a polyether flexible chain segment), and [C] is a polyamine and derivative chain segment thereof. Precise regulation and control of the performance of the emulsifier can be realized by regulating and controlling the type of epoxy resin, the types of polyamine and derivatives thereof, the molecular weight of polyether (such as polyethylene glycol diglycidyl ether) and the amine hydrogen / epoxy ratio. Emulsified asphalt prepared by adopting the emulsifier has the advantages of excellent storage stability, outstanding low-temperature ductility, firm interface bonding (forming a covalent bond with asphalt) and the like, and can be widely applied to road maintenance projects such as micro-surfacing, slurry seal and cold regeneration.

The present application discloses a modified emulsified asphalt and a preparation method thereof, an asphalt waterproof coating and a preparation method and application thereof. A method for preparing a modified emulsified asphalt comprises: mixing materials containing asphalt, filler oil and a modifier at a preset temperature to obtain a modified asphalt rubber; mixing materials containing an emulsifier, an additive and a solvent to obtain a soap solution; mixing the modified asphalt rubber and the soap solution according to a preset ratio to obtain the modified emulsified asphalt; wherein the modifier comprises a tackifying resin and SBS, the filler oil comprises at least one of cyclohexane oil and aromatic oil, and the emulsifier comprises at least one of sodium methyl coconut taurate, sodium cyclohexaneate and sodium laurate. According to an embodiment of the present application, the modified emulsified asphalt has high solid content, excellent low temperature, good initial viscosity and water resistance.

The invention discloses a low-temperature, high-performance polyionic liquid-based solid electrolyte and a preparation method and application thereof. The low-temperature, high-performance polyionic liquid-based solid electrolyte is a quasi-solid polymer similar to glycerol, has wettability and non-fluidity, uses imidazolium cations as polymer skeletons, ethyl-terminated polyethylene glycol chains as substituents, and counterions as Cl ‑ Br ‑ AA ‑ 、FSI ‑ PF6 ‑ 、BF4 ‑ TFSI ‑ Any one of the above. The low-temperature, high-performance polyionic liquid-based solid electrolyte has semi-solid non-fluidity, excellent wettability and interface compatibility, and a glass transition temperature (Tg) as low as ‑60°C. The higher ionic conductivity, interface compatibility and low-temperature resistance are conducive to improving the low-temperature electrochemical performance of solid-state batteries, and improving the rate performance and output power of solid-state batteries; the good mechanical strength, flexibility and non-volatility of the polymer structure can effectively prevent safety hazards such as internal short circuits and explosions in the battery.

The invention belongs to the technical field of petrochemical engineering, and particularly relates to composite modified hydraulic asphalt and a preparation method thereof. The hydraulic asphalt is prepared from the following components in parts by mass: 100 parts of petroleum asphalt, 5 to 10 parts of SBS modifier, 15 to 25 parts of rubber modifier, 15 to 25 parts of cosolvent and 0.1 to 0.3 part of stabilizer. According to the invention, a scheme of compounding two types of modifiers, namely the rubber powder and the SBS, is adopted, the product process is simple, the structure is stable, and the composite modified hydraulic asphalt disclosed by the invention has a specific three-dimensional elastic net-shaped structure through specific stabilizer composition and a mass ratio of a styrene chain segment to a butadiene chain segment in the SBS modifier; and the adhesive can meet the requirements of special environments, and is relatively high in viscosity. The production is simple, the high-low temperature performance is excellent, the quality of the hydraulic asphalt is improved, and the application performance of the hydraulic asphalt in a special environment is ensured.

The invention provides a formation method of a lithium iron phosphate cell, which comprises the following steps: pretreatment before formation in a first stage, cell pre-formation in a second stage, cell formation aging in a third stage and cell formation full charge in a fourth stage, the cell pre-formation in the second stage adopts step constant current charging to 60%-75% SOC, the step constant current charging is divided into three steps, the first-step constant-current charging current is larger than or equal to the second-step constant-current charging current and smaller than or equal to the third-step constant-current charging current. The SEI film formed by the method is stable and compact.

The invention relates to the technical field of battery materials, in particular to rich-pore iron phosphate, lithium iron phosphate and a preparation method thereof.The preparation method of the rich-pore iron phosphate comprises the following steps that 1, a phosphorus source, an oxidizing agent and an iron source are mixed for a reaction, and slurry a is obtained; (2) filtering and separating the slurry a to obtain a filter cake b; (3) pulping the filter cake b, adding phosphoric acid to enable the molar ratio of Fe to P in the slurry to be 0.96-0.99, adjusting the pH value of the system to be 1.0-1.5, and crystallizing to obtain slurry c; and (4) filtering the slurry c, washing the slurry, drying, and calcining to obtain the product. By controlling the process conditions of the iron phosphate, the iron phosphate with abundant pores and high specific surface area is obtained, and the lithium iron phosphate positive electrode material with excellent and stable low-temperature performance is prepared by taking the pore-rich iron phosphate as a raw material through a carbon thermal reduction method.

The invention discloses a flame-retardant low-temperature lithium metal battery electrolyte as well as a preparation method and application thereof, and belongs to the technical field of flame-retardant electrolytes. According to the lithium metal battery electrolyte, LiTFSI and LiFSI are adopted as mixed lithium salts, low-melting-point tetrahydrofuran is adopted as a main solvent, methyl nonafluorobutyl ether is adopted as a diluent, and the LiTFSI and the LiFSI are mixed according to the molar ratio of (0.5-1.5): (2-4): (1-3). The electrolyte and a lithium metal electrode show excellent interface stability, and growth of lithium dendrites and generation of side reactions are effectively inhibited, so that coulombic efficiency as high as 99% is realized, and the cycle performance of the battery is greatly improved. The unique component proportion not only solves the phase splitting problem of the electrolyte, but also endows the electrolyte with strong flame retardant ability, obviously enhances the safety of the battery, and keeps excellent performance in a low-temperature environment. The practical application and commercialization process of the lithium metal battery technology in the fields of electric automobiles, aerospace, large-scale energy storage and the like are expected to be promoted.