43results about How to "Improve high temperature performance" patented technology

The invention relates to a fiber-reinforced aerogel composite material containing a carbon and titanium dioxide biphase hybrid opacifying agent as well as a preparation method and application of the fiber-reinforced aerogel composite material. The fiber reinforced aerogel composite material containing the carbon and titanium dioxide dual-phase hybrid opacifying agent comprises an inorganic aerogel matrix, wherein a reinforced fiber skeleton and the carbon / titanium dioxide dual-phase hybrid opacifying agent are dispersed in the inorganic aerogel matrix; the carbon / titanium dioxide biphase hybrid opacifying agent comprises a titanium dioxide shell layer and carbon / titanium dioxide core-shell structure particles, wherein the surface of a reinforced fiber skeleton is coated with the titanium dioxide shell layer in situ; gaps of the reinforced fiber skeleton are filled with the carbon / titanium dioxide core-shell structure particles. The problem to be solved is to construct a two-phase hybrid shading system in which carbon / titanium dioxide core-shell particles and a titanium dioxide coating layer on the fiber surface are combined through one-step in-situ synthesis, so that the heat insulation capacity of the composite material in a high-temperature environment is synergistically improved.

The invention relates to the technical field of alloy preparation, particularly provides a 650 DEG C high temperature resistant titanium-based composite material plate, and further provides a preparation method of the plate. The titanium-based composite material plate resistant to the high temperature of 650 DEG C, provided by the invention, is prepared from the following chemical components in percentage by mass: 6.0 percent to 7.0 percent of Al, 1.0 percent to 3.0 percent of Zr, 0.5 percent to 2.0 percent of Mo, 0.4 percent to 1.0 percent of Nb, 0.4 percent to 1.0 percent of W, 0.1 percent to 0.4 percent of Si, 0.4 percent to 0.7 percent of B, 0.01 percent to 0.10 percent of C and the balance of Ti and inevitable impurities. According to the titanium-based composite material component system provided by the invention, a vanadium element which is easy to generate interface reaction at high temperature is abandoned, and refractory metal elements such as niobium and tungsten are adopted to cooperate with a ceramic reinforced phase formed by boron, carbon and the like, so that the high-temperature performance and the thermal stability of the material are improved; meanwhile, by controlling the content of molybdenum, aluminum and other elements within a specific interval, the hot working performance of the material is remarkably improved while high strength is maintained, and the contradiction between insufficient high-temperature performance and poor hot working performance of a traditional titanium-based composite material is effectively solved.

This invention belongs to the field of sodium-ion batteries, and relates to a fluorophenylphosphonate, its preparation method, and its application in sodium-ion batteries. The fluorophenylphosphonate includes di(trifluoroisopropyl)phenylphosphonate or di(hexafluoroisopropyl)phenylphosphonate; the preparation steps are as follows: using fluoroalcohol and phenylphosphonyl dichloride as raw materials, triethylamine as an acid-binding agent, and diethyl ether as a reaction solvent, the fluorophenylphosphonate is prepared by a condensation substitution reaction. Sodium-ion batteries prepared using fluorophenylphosphonate exhibit high ionic conductivity and an electrochemical stability window. This phosphonate additive preferentially decomposes at the electrode interface, inducing the formation of a thin, dense, uniform electrode-electrolyte interface phase rich in NaF inorganic components, and giving the electrolyte excellent flame-retardant properties. Sodium-ion batteries assembled with positive electrode materials exhibit good rate performance and cycle stability, with a cycle life exceeding 5000 cycles at room temperature. Simultaneously, this electrolyte also exhibits excellent cycle performance at a high temperature of 60°C.

The utility model relates to the technical field of silicon powder heating, specifically relates to a heating device for powder purification of direct pulling method, including heating block, the lower part of heating block is provided with the footboard, the footboard is connected with heating block through the connecting device, the connecting device includes the connecting hole of setting at the top of footboard, the bottom of connecting hole is provided with the plug pipe, a plurality of expansion joints are provided on the pipe body of plug pipe, improve the fixed effect of connection, guarantee the safe use, prolong the life, reduce the production cost.

This invention relates to the field of refractory materials technology, and more particularly to a cementless magnesia castable and its application method. The castable consists of aggregate, matrix material, and a water-reducing agent; the aggregate is 60-80 parts of magnesia particles; the matrix material is: fine magnesia powder, active α-Al₂O₃ micro powder, sintered corundum powder, silica micro powder, and aluminum-based metal microcapsules. The application method of the cementless magnesia castable is as follows: the water-reducing agent and matrix material are mixed evenly to obtain a premixed matrix material; the aggregate and premixed matrix material are stirred evenly, water is added and wet-mixed to obtain a slurry; the evenly mixed slurry is poured into a mold, vibrated to form the slurry, and then cured. This cementless magnesia castable exhibits certain initial strength, excellent high-temperature performance, excellent resistance to slag erosion and thermal shock, and a long service life, making it widely applicable in tundishes and ladles.

This invention provides a TiC-based non-magnetic alloy, its preparation, and its application. The TiC-based non-magnetic alloy comprises, by weight percentage: Ni 25–40 wt%, Cr 5.5–8.6 wt%, Mo 2.5–4.0 wt%, C 0.8–1.3%, TiC 46–66 wt%, and other unavoidable trace impurities. The TiC-based non-magnetic alloy comprises TiC, Ni, Cr, Mo, and C, with appropriate proportions of each component, resulting in low magnetic properties, high hardness, high wear resistance, high-temperature performance, oxidation resistance, and corrosion resistance. Furthermore, the hard phase uses TiC, which has a low self-lubricating coefficient, and excludes WC. Therefore, the TiC-based non-magnetic alloy has a uniform grain size distribution, good internal stress consistency, and is less prone to cracking and deformation, extending its service life and demonstrating good product stability.

The invention discloses high-purity heat-resistant quartz ceramic and a preparation method and application thereof, and belongs to the technical field of inorganic non-metallic materials, the high-purity heat-resistant quartz ceramic comprises the following raw materials by mass fraction: 50-80% of a fused high-purity quartz raw material, 10-50% of fused high-purity quartz fine powder, 0.1-1% of a composite mineralizer, and 0.1-5% of a binder; the content of CaO in the high-purity heat-resistant quartz ceramic is less than or equal to 0.1%. The aspects of raw material deep processing, additives, the preparation process and the like are strictly controlled, the addition of calcium-containing substances is avoided, the eutectic point phase is fundamentally reduced, the alkali corrosion resistance and the high-temperature strength are further improved, and the finally obtained quartz ceramic has the advantages of high refractoriness under load, excellent thermal shock resistance and corrosion resistance, and the service life of the quartz ceramic is prolonged. The method is suitable for severe environments such as oxy-fuel combustion glass kilns.

This invention discloses an ultra-high strength heat-resistant titanium-based composite material and its preparation method. The preparation method includes: ball milling and mixing titanium alloy powder, reinforcing phase raw material, and β-stabilizing element powder to obtain a mixed powder, wherein the content of the β-stabilizing element in the mixed powder is 0.01 wt.%–9 wt.%; and using a laser melting deposition additive manufacturing method: delivering the mixed powder to a molten pool on the surface of a substrate via a powder feeding gas flow, melting and depositing it on the substrate surface under laser action, and obtaining the ultra-high strength heat-resistant titanium-based composite material through layer-by-layer deposition. The ultra-high strength heat-resistant titanium-based composite material prepared by this method achieves ultra-high strength, breaking through the performance bottleneck of the ultimate load-bearing capacity of titanium-based composite materials.

The application discloses a FBG type wearable fingertip three-dimensional force sensor for traditional Chinese medicine and a three-dimensional force measuring method, and the sensor comprises a fingertip, an elastic body, a fixed finger sleeve and a plurality of optical fibers; the fingertip is a force collector of the FBG type wearable fingertip three-dimensional force sensor for traditional Chinese medicine; the first end of the elastic body is connected with the fingertip, receives the force transmitted by the fingertip and generates deformation; the second end of the elastic body is connected with the fixed finger sleeve and is used for wearing on a finger; the plurality of optical fibers are uniformly arranged on the elastic body and generate deformation in X, Y and Z directions under the deformation of the elastic body, so that the three-dimensional force of the fingertip is obtained. The sensor adopts the FBG, no current passes through the optical fiber, and no electrical connection is needed; the force sensing system is not disturbed by electric noise and electromagnetic interference; the sensing element has small size and light weight, high precision, zero drift, wide frequency response and good high-temperature performance.

The application provides a double-coating lithium iron phosphate positive electrode sheet, a preparation method and application thereof. The preparation method comprises the following steps: mixing modified large-particle lithium iron phosphate, modified small-particle lithium iron phosphate, a conductive agent, a binder and a solvent to obtain a first slurry and a second slurry; adopting double-layer slot extrusion coating to coat the first slurry on the surface of a current collector and coat the second slurry on the surface of the first slurry; and drying and rolling to obtain the double-coating lithium iron phosphate positive electrode sheet; the modified large-particle lithium iron phosphate is doped with Ti and Nb, and the modified small-particle lithium iron phosphate is doped with Mg and Al. The application adopts a multi-element doped positive electrode material combined with a double-layer coating preparation method to avoid the shortcomings of LFP materials, improve the rate performance, high-temperature performance and cycle performance of LFP, and has the advantages of simple preparation process and easy industrial production. The prepared positive electrode material and the secondary battery using the same have excellent comprehensive performance, and have a wide application prospect in the field of power batteries.

The application provides a kind of vehicle grease composition and its preparation method.The vehicle grease composition comprises the following components by weight: base oil 60-92 parts, thickener 8-40 parts, friction modifier additive 1-10 parts;The thickener is selected from one or more of polyurea soap powder, composite calcium sulfonate soap powder and amide sodium soap powder.The vehicle grease composition provided by the application can greatly reduce the dependence of vehicle grease on lithium resources, while the comprehensive performance is excellent, meets the lubrication demand of commercial vehicle hub bearing, and the process is stable and feasible.

The gradient hard alloy comprises a core layer and surface layers, the core layer is located between the two surface layers, each of the core layer and the surface layers comprises a hard phase and a high-entropy binding phase, and the hard phase comprises WC and a cubic phase compound; components of the high-entropy binding phase comprise at least five of first transition metal elements and second transition metal elements, the first transition metal elements comprise at least two of Co, Ni and Fe, the second transition metal elements comprise at least three of Re, Ru, Rh, Pd, Os, Ir and Pt, the mass content of the high-entropy binding phase on the surface layer is 1.0-2.0 times of the nominal mass content, the surface layer is free of cubic phase compounds, and the thickness of the cubic phase compounds is 0.5-1.5 mm. The gradient hard alloy has the advantages of being high in density, free of third phase precipitation and good in alloy performance.

The invention provides anti-aging self-adhesive high-temperature vulcanized silicone rubber and a preparation method thereof. The aging-resistant self-adhesive high-temperature vulcanized silicone rubber is prepared from the following components in parts by mass: 90 to 100 parts of raw methyl vinyl silicone rubber, 40 to 50 parts of fumed silica, 10 to 20 parts of a borosiloxane structure self-adhesive agent, 4 to 10 parts of cerium oxide paste, 1 to 3 parts of a heat-resistant agent, 0.1 to 0.3 part of zinc stearate, 4 to 6 parts of hydroxyl silicone oil and 2 to 3 parts of a peroxide paste catalyst. Gas-phase silicone rubber and boric acid are combined to avoid combination of lone pair electrons of an oxygen element in a hydroxyl group and a 2p empty orbit of a B element in a synthesis process and enhance self-adhesion and mechanical properties, boron and benzene in a heat-resistant agent are introduced into a main chain, boron and silicon form a Si-O-B bond, the energy of the O-B bond can reach 537.6 J / mol, the energy of the Si-O bond can reach 422.5 J / mol, higher energy is needed for bond energy damage, and the service life of the heat-resistant agent is prolonged. And at high temperature, degradation caused by back biting of oxygen elements in hydroxyl can be avoided, side group oxidation is prevented through mutual cooperation of benzene and cerium oxide, and the aging resistance and high-temperature resistance of the silicone rubber are remarkably improved.

The present application relates to a kind of preparation method of full solid battery double-layer ultrathin electrolyte film based on transfer printing technology.The present application utilizes the high voltage stability of halide layer and the high ionic conductivity of sulfide layer to synergistically improve the cycle life and high rate performance of battery and other performances through halide / sulfide double-layer electrolyte design.Further, the transfer printing process of multi-layer electrolyte film is designed specifically, and the gradient drying process can avoid substrate deformation, effectively prevent halide / sulfide interlayer cracking, and enhance the interlayer adhesion, achieving electrode thinning, high mechanical strength and interface stability.The present application solves the technical bottleneck of the application difficulty of double-layer electrolyte structure in full solid battery through material system optimization and transfer printing process innovation, and is suitable for the industrial production of high energy density solid state battery.

The present application relates to a low-cost iron-nickel-based heat-resistant alloy and a high-speed rolling method thereof, and belongs to the technical field of special alloy manufacturing. The present application solves the technical problems of cracking, short tool life, high energy consumption and low efficiency in subsequent solid solution treatment caused by uneven material temperature rise and cooling during high-speed rolling of the existing heat-resistant alloy. In the method of the present application, the heated heat-resistant alloy rolling stock is sequentially passed through the rough rolling, intermediate rolling and finishing rolling units. At least two cooling devices are arranged at the key positions in the later stage of the finishing rolling unit. The polyacrylamide aqueous solution containing specific particle size and proportion of aluminum oxide powder is used for intermittent jet cooling of the wire. The finished wire is directly put into the solid solution furnace for online solid solution treatment and water cooling. The present application realizes the integrated production of heat-resistant alloy wire from rolling to heat treatment with high efficiency, high quality and low energy consumption. The prepared wire has uniform structure and excellent performance, and is especially suitable for manufacturing engine valves.

The invention belongs to the field of negative-electrode-free batteries, and particularly discloses a modified negative electrode current collector, a preparation method and application thereof and a negative-electrode-free sodium metal battery, the modified negative electrode current collector comprises a conductive substrate and a modified coating compounded on the surface of the conductive substrate, and the modified coating comprises modified graphite; the modified graphite is obtained by performing first-stage liquid phase modification on graphite through a modifier A and then performing second-stage liquid phase modification treatment on the graphite through a modifier B; the modifier A comprises HF and MFn; m comprises at least one of Cu, Ag, Mg and Ca, and n is the valence of M; the modifier B comprises a compound with a structure shown in a formula 1 (). The modified current collector provided by the invention can effectively reduce irreversible loss of sodium metal in the cycle process of the negative-electrode-free sodium metal battery and guide uniform sodium metal deposition / stripping, so that the long cycle life and the high-temperature performance of the negative-electrode-free sodium metal battery are remarkably improved.

The invention discloses a high-fracture-toughness silicon nitride ceramic ball and a preparation method thereof, and belongs to the field of high-performance structural ceramic materials. The ceramic ball is prepared by taking high-purity alpha-SiN powder as a matrix and adopting a composite sintering aid system composed of an oxygen-free rare earth compound, aluminum nitride and beta-SiN seed crystal through an air pressure sintering process controlled by program pressure. Under the synergistic effect of the auxiliary system and a specific process, 'bimodal distribution 'beta-SiN columnar crystals and high-melting-point and high-toughness intergranular phases are generated in situ in the material, so that the fracture toughness of the material is remarkably improved on the premise of not sacrificing hardness and strength. The fracture toughness of the silicon nitride ceramic ball is up to 8.5-11.0 MPa.m / , the bending strength is 750-1050 MPa, and the silicon nitride ceramic ball is particularly suitable for precision bearings under high-speed and high-load working conditions, such as a wind power generation main shaft, an aerospace engine main shaft and the like.

The present application relates to the technical field of castable preparation, in particular to a preparation process of wear-resistant and alkali-resistant castable, comprising: S1, batching, S2, mixing and forming, S3, adding auxiliary material treatment, S4, heat treatment of main material; the method significantly improves the wear resistance of the material through the high hardness of the electric smelting corundum particles and the reinforcing effect of the coating; through the synergistic effect of the alkali resistance of mullite sheet and the coating, the ability to resist alkali corrosion is enhanced, especially the protective effect of the surface layer; through multiple steps such as dry mixing, wet mixing and vibration forming, the uniform dispersion of raw materials and the compactness of castable are ensured, the internal pores are reduced, and the structural stability and thermal shock resistance of the material are improved; through the above process, the castable also improves the crack resistance and structural stability while maintaining good wear resistance and alkali resistance.

This invention discloses a high-temperature resistant aluminum alloy wire suitable for arc-fused-wire additive manufacturing and its preparation method. The alloy wire comprises: manganese (Mn): 0.3-0.5%, copper (Cu): 5.3-5.8%, titanium (Ti): 0.15-0.35%, boron (B): 0.0005-0.006%, vanadium (V): 0.05-0.3%, zirconium (Zr): 0.05-0.2%, cadmium (Cd): 0-0.4%, silicon carbide (SiC): 0.1-0.4%, iron (Fe): ≤0.15%, silicon (Si): ≤0.06%, magnesium (Mg): ≤0.05%, zinc (Zn): ≤0.1%, other individual impurity elements: ≤0.05%, total other impurity elements: ≤0.15%, and the balance being aluminum (Al). The wire of this invention exhibits a uniform microstructure and moderate strength. The deposit formed by the arc-fused-wire additive manufacturing process possesses excellent strength, toughness, and other mechanical properties, with significantly improved heat resistance.

The application discloses a heat-resistant high-strength passenger car aluminum matrix composite brake disc and a preparation method thereof. The brake disc comprises an aluminum alloy base layer and a composite material friction layer combined through friction welding. The composite material friction layer comprises Al-Fe-V-Si aluminum alloy and reinforcing particles. The reinforcing particles are at least one of SiC, BN and TiC. The preparation process of the brake disc is as follows: placing the composite material friction layer on the base layer, adjusting the position and then welding through friction stir welding, and the brake disc is obtained. The brake disc combines the aluminum alloy base layer and the composite material friction layer through friction welding, which not only ensures that the brake disc has good toughness, but also improves the wear resistance and heat resistance, so that the overall mechanical properties of the aluminum matrix composite brake disc are better, and the reliability of the brake disc is improved.

This invention belongs to the technical field of aluminum alloy materials and discloses a high-strength, heat-resistant aluminum-lithium alloy and its preparation process. The aluminum-lithium alloy composition and weight percentage applicable to this process are: Cu 3.6-4.4%, Li 1.1-1.5%, Mg 0.3-1.2%, Mn 0.4-0.8%, Zr 0.09-0.15%, Ti 0.02-0.05%, Sc 0.10-0.30%, Ag 0.25-0.40%, impurity elements Fe≤0.1%, Si≤0.1%, other impurities ≤0.05% individually, ≤0.15% in total, with the balance being Al. The preparation process of this alloy is: aluminum-lithium alloy melting and casting → homogenization → hot deformation → solution quenching → cold deformation → artificial aging. After the above process, the alloy provided by this invention exhibits good room temperature performance while also possessing high strength at high temperatures of 250℃ and 300℃.

This invention relates to a wide-temperature-range ether-based electrolyte with a customized high-voltage-resistant interface layer in alkali metal batteries, its preparation method, and its application. The wide-temperature-range ether-based electrolyte comprises a base electrolyte, an anion acceptor additive, and an anion additive containing a specific elemental alkali metal salt. The base electrolyte comprises an alkali metal salt and an ether solvent. In the wide-temperature-range ether-based electrolyte, the concentration of the alkali metal salt is 0.1–1.5 mol·L⁻¹. ‑1 The concentration of the anion acceptor additive is 0.5~5wt%, and the concentration of the alkali metal salt anion additive containing specific elements is 0.1~5wt%. Compared with the prior art, the CEI layer in the wide-temperature-range ether electrolyte of the present invention is more dense and exhibits enhanced chemical and thermal stability, effectively suppressing the positive electrode oxidation reaction and alleviating ion transport limitation, improving the high-temperature, room-temperature, and low-temperature cycle performance of the battery, and increasing the battery's service life.

The invention relates to the technical field of gasoline engine oil, and discloses a gasoline engine oil composition and a preparation method thereof. Based on 100 parts by weight of the gasoline engine oil composition, the gasoline engine oil composition comprises the following components in parts by weight: 80-85 parts of base oil, 10-15 parts of a gasoline engine oil complexing agent, 3-5 parts of a viscosity index modifier and 0.1-0.5 part of a pour point depressant, wherein the base oil comprises at least two kinds of base oil of which the pour point is less than or equal to-30 DEG C. The low-temperature performance of the gasoline engine oil is effectively improved, and meanwhile good high-temperature performance is guaranteed.

This invention provides a short-process manufacturing technology for high-performance titanium-aluminum alloys, relating to the technical field of titanium-aluminum alloy material preparation. The manufacturing technology uses hydrogenated dehydrogenated powder, aluminum-vanadium alloy, and aluminum-niobium alloy as raw materials. Through hydrogenated dehydrogenation powder preparation, cold isostatic pressing, vacuum sintering, and subsequent processing, a uniformly composed titanium-aluminum alloy is prepared. Utilizing the intrinsic brittleness of titanium-aluminum after its self-propagating reaction, and combining the high purity and easily breakable characteristics of aluminum-vanadium and aluminum-niobium master alloys, the technology achieves thorough mixing and refinement of multiple elements under solid-state conditions. This avoids the microstructure inhomogeneity caused by diffusion limitation in high-vanadium and high-niobium systems, and overcomes the problems of component segregation, coarse microstructure, and difficulty in removing inclusions associated with traditional casting methods for preparing titanium-aluminum alloys. Through the powder metallurgy short-process manufacturing design, this technology offers significant technical advantages in reducing raw material and manufacturing costs, improving compositional and microstructure uniformity, enhancing comprehensive mechanical properties, and achieving large-scale production.

The application provides an amino-modified micro-nanoparticle modified asphalt and a preparation method thereof. The asphalt is prepared from amino-modified micro-nanoparticles and acid anhydride modified asphalt, wherein the weight ratio of the amino-modified micro-nanoparticles to the acid anhydride modified asphalt is 0.005-0.05:1. The preparation method of the modified asphalt is as follows: a proper amount of amino-modified micro-nanoparticles is added into molten acid anhydride modified asphalt, the temperature is maintained at 100-200 DEG C, and the stirring is continuously carried out at a speed of 1000-2000 rpm for 0.5-5 h to obtain the modified asphalt with uniformly dispersed micro-nanoparticles. The modified asphalt prepared by the application has significantly improved high-temperature performance, enhanced anti-rutting capacity and improved anti-aging performance compared with the base asphalt, and has great application potential in highways in high-temperature regions.

The application discloses a kind of composite electrode and its preparation method and metal lithium battery.The composite electrode includes negative electrode, positive electrode and current collector, the current collector is located between positive electrode and negative electrode;The negative electrode includes metal lithium composite material layer, the metal lithium composite material layer includes granular double-skeleton lithium carbon composite material, the double-skeleton lithium carbon composite material has lithium boron particle as core, the core has lithium boron alloy structure skeleton and active lithium, three-dimensional porous carbon skeleton space layer formed by nano carbon material is arranged on the surface of the core, lithium boron alloy structure skeleton and carbon skeleton space layer formed by carbon material constitute double skeleton.The composite electrode has small volume change, long cycle life and can resist high temperature above 200 DEG C, is one of the candidate electrodes of power battery.

The application discloses a warm-mixing in-place hot recycling asphalt mixture modifier and a preparation method thereof. The modifier comprises: 90# base asphalt, coumarone-indene resin, waste rubber powder, linear 30 / 70 type SBS, 4,4'-dithiodimorpholine, butyl propionate, poly-alpha-olefin, N-(2-hydroxyethyl)dodecylamide, cocamide propyl betaine and composite release agent. The modifier can reduce the use amount of new asphalt and recycling agent to a certain extent, significantly improve the performance of the recycled pavement and solve the problems of poor low-temperature performance and poor water damage resistance of the recycled pavement. In addition, some additives contained in the modifier have certain surface-active warm-mixing agent characteristics, thereby reducing the mixing temperature and improving the compaction degree of the in-place hot recycling mixture.

This invention relates to the field of dust removal filter media technology, specifically to a fiber composite needle-punched filter media and its preparation method. To enhance the high-temperature performance of the needle-punched filter media, this invention adds modified carbon fiber material to polyethylene terephthalate (PET). This invention further enhances the compatibility and bonding strength between the carbon nanofibers and PET by oxidizing the surface and then carboxylating it, introducing fluorine elements onto the carbon fiber surface, and further preparing a PET-like structure. This significantly increases the compatibility and bonding strength between the carbon nanofibers and PET. Simultaneously, the fluorine introduced in this process significantly improves the stability of polyester fibers at high temperatures and enhances their resistance to chemical corrosion such as acids and alkalis, thereby improving the service life of the filter media in high-temperature flue gas.

The invention relates to a non-aqueous electrolyte and a lithium ion battery. In order to develop the sulfur-free electrolyte and the lithium ion battery with good high-temperature and cycle performance, the cycle performance, the high-temperature performance and the rate performance of the lithium ion battery are improved by compounding the additive A and the boron-containing lithium salt additive; furthermore, other components in the non-aqueous electrolyte are combined, so that the lithium ion battery still has more excellent high-temperature performance and cycle performance and more excellent safety performance and electrochemical performance when the voltage is increased to 4.5 V or even higher while the high-temperature performance and cycle performance of the lithium ion battery under conventional voltage are ensured. Wherein the structural formula of the additive A is as follows: R1 is selected from alkylene, fluoroalkylene, alkenylene or fluoroalkenylene, and R2 is selected from fluoroalkyl or fluoroalkenyl; and the additive B is boron-containing lithium salt.