69 results about "Succinonitrile" patented technology

The invention provides a battery and an electric device. A positive plate comprises a positive active material, and the positive active material is doped and / or coated with a lanthanum element; the surface of the diaphragm is coated with a ceramic coating; the electrolyte comprises a first solvent, a second solvent, a first additive and a second additive; the first solvent comprises a cyclic carbonate compound, the second solvent comprises a chain fluorosulfonamide compound, the first additive comprises mannitol carbonate sulfate, and the second additive comprises succinonitrile; the lanthanum element is doped / coated on the positive active material, so that the release of lattice oxygen at high voltage or high temperature can be effectively inhibited, and the exothermic reaction activity at the thermal runaway initial temperature is reduced; the first additive and the second additive in the electrolyte respectively form a compact CEI film and an SEI film with high thermal stability on the surfaces of the positive electrode and the negative electrode; the diaphragm ceramic coating provides a physical barrier, the thermal shrinkage temperature of the diaphragm is increased, and internal short circuit is prevented.

The invention discloses a preparation method of a high-performance modified dry-method electrode and application of the high-performance modified dry-method electrode in a lithium metal battery, the method comprises the following steps: step 1, heating and hot-melting succinonitrile under a hydrothermal condition to obtain clear and transparent liquid, and then adding lithium salt into the clear and transparent liquid to complete preparation of a dry-method modified additive; 2, premixing a positive electrode material, vapor-phase growth carbon fibers and a dry-method modified additive; 3, adding an adhesive into the premixed material to obtain a modified dry-method electrode material; and step 4, pouring the modified dry-method electrode powder into a mortar, after preliminary film formation, gradually thinning to 60-75 m in thickness under a roller press, and finally performing hot rolling with a current collector to complete the preparation of the modified dry-method electrode. According to the invention, by adding the additive into the dry electrode, an excellent high-voltage-resistant electrode interface is constructed, and the lithium ion conduction rate of the electrode is improved, so that the electrochemical performance of the dry electrode is further improved, and the application of the dry electrode in a high-voltage lithium metal battery is promoted.

The invention belongs to the technical field of development and manufacturing of solid-state electrolyte materials and solid-state lithium batteries, and particularly relates to an all-solid-state oxide-polymer electrolyte membrane as well as a preparation method and application thereof. The electrolyte membrane comprises a polymer matrix, a lithium salt, butanedinitrile, lithium lanthanum zirconium tantalum oxide and graphite phase carbon nitride, the polymer matrix, the lithium salt, the butanedinitrile, the lithium lanthanum zirconium tantalum oxide and the graphite phase carbon nitride are uniformly mixed to form a solid film; the polymer matrix is polyacrylonitrile and forms a framework of the electrolyte membrane; the lithium salt, the butanedinitrile, the lithium lanthanum zirconium tantalum oxide and the graphite phase carbon nitride are at least physically and uniformly dispersed in the polymer matrix. The electrolyte membrane can be prepared through the steps of slurry preparation, defoaming treatment, membrane forming processing, drying and curing and the like, and can be used in a solid-state lithium battery, so that the contact between the electrolyte membrane and an electrode interface is improved, side reaction is inhibited, the ion transmission efficiency and mechanical property are improved, the interface impedance is reduced, and the cycling stability and safety of the solid-state lithium battery are enhanced.

The invention discloses a low-temperature high-conductivity composite solid-state electrolyte membrane and a preparation method and application thereof, and relates to the technical field of solid-state lithium battery materials, the low-temperature high-conductivity composite solid-state electrolyte membrane comprises: a polymer matrix composed of poly (1, 3-dioxolame) and a polyvinylidene fluoride-hexafluoropropylene copolymer; the ion conduction network is composed of a metal organic framework filler with the surface modified with-SO3Li groups and sulfonic acid lithiated carbon nanotubes arranged in the axial direction of the polymer matrix; a first anti-freezing interface layer and a second anti-freezing interface layer are arranged on the surfaces of the two opposite sides of the polymer matrix, and the first anti-freezing interface layer and the second anti-freezing interface layer are butanedinitrile-glutaronitrile eutectic plastic crystal layers composed of butanedinitrile, glutaronitrile, lithium salt and a nano reinforcing agent respectively. The solid electrolyte is suitable for polar scientific investigation equipment, spacecrafts and other low-temperature environments, and solves the industrial problems of sharp increase of low-temperature grain boundary impedance and interface contact failure of the traditional solid electrolyte.

A solid electrolyte material contains an Li salt that has a fluorine-containing anion, an in organic filler, and a polymer. The inorganic filler has a surface modified with a fluorinated alkyl. The solid electrolyte material further includes succinonitrile. The inorganic filler contains at least one selected from the group consisting of SiO2, TiO2, ZrO2, and MgO; and the fluorinated alkyl contains at least one of a 1H, 1H, 2H, 2H-tridecafluoro-n-octyl group and a 1H, 1H, 2H, 2H-heptadecafluorodecyl group.

The present application discloses a eutectic gel electrolyte for lithium metal batteries and its preparation method and application, which belongs to the field of solid electrolytes. The eutectic gel electrolyte of the present invention is prepared by photocuring a photocurable precursor solution containing a photoinitiator, wherein the photocurable precursor solution contains a two-component liquid compound and a deep eutectic solvent; the two-component liquid compound contains 4-acryloylmorpholine and a photocurable polyethylene glycol derivative; the deep eutectic solvent is formed by a liquid mixture containing succinonitrile, lithium bis(trifluoromethylsulfonyl)imide and fluoroethylene carbonate. The eutectic gel electrolyte of the present invention is composed of a deep eutectic solvent having functional groups such as cyano and sulfonyloxy and a polymer electrolyte having functional groups such as etheroxy and a unique skeleton structure. It can give advantages such as high ionic conductivity, wide electrochemical window and high interface stability based on the interaction between functional groups and the spatial confinement of the polymer electrolyte skeleton structure.

Provided in the present application are a secondary battery and an electronic device. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, and an electrolyte solution. The positive electrode sheet comprises a composite current collector and a positive electrode material layer provided on at least one surface of the composite current collector. The positive electrode material layer comprises a lithium nickel cobalt manganese oxide compound. On the basis of the total molar amount of metal elements other than lithium, the molar percentage content of nickel in the lithium nickel cobalt manganese oxide compound is X, wherein X>80%. The electrolyte solution comprises adiponitrile and succinonitrile. On the basis of the mass of the electrolyte, the mass percentage content of adiponitrile is B1, and the mass percentage content of succinonitrile is B2, wherein 0.01≤X×B1 / B2≤90. The present application can improve the capacity retention ratio and lithium ion acceptance of a secondary battery after a high- or low-temperature impact test.

The invention provides a lithium battery negative electrode with an interface polymer stable interface layer and a preparation method and application of the lithium battery negative electrode. The preparation method comprises the following steps: providing an alloy negative electrode substrate of which the surface is modified by an organic lithium interface layer; and coating a polymer electrolyte precursor containing an electron-deficient double-bond polymer monomer, lithium salt and succinonitrile on the surface of the negative electrode, sealing and standing for 1-24 hours, and triggering the electron-deficient double-bond polymer monomer to generate in-situ anionic polymerization on the surface of the alloy negative electrode substrate by using an organic lithium interface layer as an initiator, thereby obtaining the lithium ion battery negative electrode. A polymer interface layer chemically bonded with the substrate is formed on the surface of the lithium battery negative electrode. Through an innovative interfacial polymerization technology, a stable polymer interface layer is constructed on the surface of the alloy negative electrode, and the interface stability, the electrochemical performance, the structural integrity, the process practicability and other dimensions are remarkably improved.

The invention belongs to the field of organic chemical synthesis, and relates to a method for preparing butanediamine and co-producing pyrrolidine by using butanedinitrile, which comprises the following steps: S1, reacting acrylonitrile with hydrocyanic acid in a fixed bed reactor filled with a first catalyst to obtain butanedinitrile; the first catalyst is filled in a fixed bed reactor in a solid form, and the first catalyst comprises a carrier and an active component loaded on the carrier. And S2, dissolving the butanedinitrile obtained in the step S1 into a pyrrolidine ionic liquid solvent, then adding a second catalyst and alkali, then introducing hydrogen, and reacting to obtain butanediamine and pyrrolidine. According to the method, continuous and easy-to-separate production of butanedinitrile is realized, a by-product is directionally converted into tetrahydropyrrole with a high added value through a specific reaction system, and the safety, the economical efficiency and the resource utilization rate of the process are remarkably improved.

The present application discloses a secondary battery and an electronic device, the secondary battery comprising an electrolyte and a separator, the separator comprising a polyolefin base material and a coating layer provided on at least one surface of the polyolefin base material, the coating layer comprising inorganic particles, and the electrolyte containing ether nitrile, butanedione, propionate and a lithium salt containing boron in specific amounts. By setting the total content of ether nitrile, butanedione and propionate in the electrolyte to a specific range, and setting the total content of butanedione and the lithium salt containing boron to a specific range, the present application inhibits the decomposition of ether nitrile and propionate, helps to form a stable coating film on the positive electrode surface, thereby not only improving the heat resistance of the separator, but also significantly improving the safety performance and vibration resistance of the secondary battery.

This invention discloses a photolithographically patternable lithium-ion electrolyte, its preparation method, and its applications. The electrolyte is a photolithographically curable lithium-ion electrolyte composition, comprising, by mass percentage, LiTFSI, polyethylene glycol methyl ether methacrylate, bisphenol A ethyl oxide dimethacrylate, fluoroethylene carbonate, succinic acid, 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMPP), 3-(isobutyryloxy)propyltrimethoxysilane, and 2-methyl-2-acrylate-2-hydroxyethyl. This invention also discloses a stepwise preparation method for this composition and its applications in micro-energy storage and ion-electronic devices such as micro solid-state batteries, ion-controlled transistors, and neuromorphic devices. This electrolyte can be patterned at the micro-nano scale using standard photolithography processes, exhibiting excellent lithium-ion conductivity, electrochemical stability, mechanical flexibility, and optical transparency. It also shows good interface compatibility with gold electrodes / silicon wafers, requiring no additional etching or transfer processes. This solves the technical problems of existing solid-state electrolytes being difficult to fabricate at the micro-nano scale and incompatible with microelectronic processes, and has broad application prospects in the fields of micro-nano fabrication and micro-devices.

The present disclosure provides a solid electrolyte material capable of suppressing a decrease in ion conductivity. The solid electrolyte material is characterized by containing a polymer electrolyte, an inorganic filler, and butanedinitrile, and the polymer electrolyte contains an anionic polymer.

The application discloses a kind of etching liquid in the field of etching liquid, by weight, containing hydrogen fluoride 6-9%, butanedinitrile 5-8%, ethanol 15-20%, and the balance is ultrapure water.The complexation reaction of butanedinitrile and hydrofluoric acid can be prevented in the application, and the hydrolysis of hydrofluoric acid is prevented.The complex can be gradually dissociated by temperature control, so that the effective concentration of hydrofluoric acid in the solution can be maintained, and there is no need to frequently supplement hydrofluoric acid into the solution or constantly prepare new hydrofluoric acid solution, and there is no need to use other surfactants.The etching liquid has the advantages of long-acting, stable and low cost, and can be used in the etching processing of vehicle-grade silicon nitride chip.

A solid electrolyte material capable of suppressing a decrease in ionic conductivity is provided. The solid electrolyte material includes a polymer electrolyte, an inorganic filler, and succinonitrile, wherein the polymer electrolyte includes an anionic polymer.

Provided in the present application are a secondary battery and an electronic device. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, and an electrolyte solution. The positive electrode sheet comprises a composite current collector and a positive electrode material layer provided on at least one surface of the composite current collector. The positive electrode material layer comprises a lithium nickel cobalt manganese oxide compound. On the basis of the total molar amount of metal elements other than lithium, the molar percentage content of nickel in the lithium nickel cobalt manganese oxide compound is X, wherein X>80%. The electrolyte solution comprises adiponitrile and succinonitrile. On the basis of the mass of the electrolyte, the mass percentage content of adiponitrile is B1, and the mass percentage content of succinonitrile is B2, wherein 0.01≤X×B1 / B2≤90. The present application can improve the capacity retention ratio and lithium ion acceptance of a secondary battery after a high- or low-temperature impact test.

A secondary battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte. The positive electrode plate includes a positive electrode current collector, and a positive electrode active material layer and an inorganic coating are provided on a surface of the positive electrode current collector. The electrolyte includes an additive, and the additive includes at least one of lithium difluorophosphate, succinonitrile, adiponitrile, 1,3,6-hexanetricarbonitrile, or 1,2,3-tris(2-oxyethoxy)propane. A mass per unit area of the inorganic coating is A g / m2, and based on a mass of the electrolyte, a mass percentage of the additive is B %, satisfying 0.01≤B / A≤5. Selection of the foregoing additives and control of B / A within the foregoing range are conducive to improving high-temperature safety performance of the secondary battery at high voltage.

This application discloses a solid electrolyte separator based on esterified cellulose and its preparation method, specifically including the following steps: first, esterified cellulose derivatives are obtained by modifying cellulose acetate as a base with 4-methylphthalic anhydride; then, the esterified cellulose derivative is dissolved in N,N-dimethylformamide with lithium bis(trifluoromethanesulfonylimide) and succinate, mixed evenly, coated onto a mold, and vacuum dried to obtain the separator. This separator exhibits good mechanical properties and interfacial stability, effectively suppressing lithium dendrite growth and improving battery safety. Lithium metal batteries assembled using this separator demonstrate high discharge specific capacity and good cycle stability, making them suitable for high-energy-density solid-state lithium batteries.

The invention relates to a method for preparing 1, 4-butanediamine from succinonitrile, which comprises the following steps: S1, adding succinonitrile, Raney nickel, alkali and an alcohol solvent into a system under a nitrogen condition, and heating to 30-100 DEG C; s2, adding sodium borohydride into the system, and carrying out gas phase detection on the reaction process; after the reaction is completed, stopping the reaction, filtering and rectifying; and when the GC purity of the distillate reaches 99% or above, receiving the product. The invention provides a scheme for preparing the 1, 4-butanediamine, which is mild in reaction condition, easy to operate and relatively low in cost, and has a great industrial application prospect.

The application provides an electrolyte, an electrochemical device containing the electrolyte and an electronic device. The electrolyte comprises ethylene carbonate, propylene carbonate and fluoroethylene carbonate. The mass percentage of ethylene carbonate is a, 1.0% <= a <= 20%, the mass percentage of propylene carbonate is b, 12% <= b <= 35%, based on the mass of the electrolyte. The electrolyte further comprises an additive B. The additive B comprises at least one of butanedinitrile, hexanedinitrile, 1,4-dicyano-2-butene, ethylene glycol dicyan ether, 1,3,6-hexanetrimethylnitrile or 1,2,3-tris(2-cyanooxy)propane. The mass percentage of the additive B is 0.5% to 4%, based on the mass of the electrolyte. The electrochemical device with the electrolyte has good high-temperature storage performance and cycle performance.

A battery structure is provided that includes a single layer dielectric film coating organic composite ceramic particles. [Solution] The battery structure of the present invention includes a negative electrode (10), a positive electrode (20), and a dielectric film (30) positioned between the positive and negative electrodes. The dielectric film includes a polymer material (321) serving as the base of the dielectric film, the polymer material including a mixture of polyvinylidene fluoride-hexafluoropropylene copolymer, hydrogenated nitrile butadiene rubber, and succinonitrile. A lithium salt (322) is dispersed in the polymer material. A plurality of composite ceramic particles (100) are dispersed in the polymer material. Each composite ceramic particle includes ceramic particles for guiding and dispersing lithium ions, a dopamine layer coating the outer surface of the ceramic particle to form a primary particle, and a PVDF layer coating the outer surface of the primary particle.

The invention relates to a preparation method and application of a deep eutectic gel polymer electrolyte, and belongs to the technical field of chemical power sources, and the specific scheme comprises the following steps: heating and melting 1, 1-thiophane-3-yl methacrylate and succinonitrile according to a certain mass ratio to obtain a deep eutectic solvent; the preparation method comprises the following steps: cooling to room temperature, adding alkali metal ion salt and a diluent into a deep eutectic solvent, fully stirring to obtain a deep eutectic electrolyte, adding a cross-linking agent and a thermal initiator into the deep eutectic electrolyte to obtain a precursor solution, and initiating copolymerization of 1, 1-thiophane-3-yl methacrylate and the cross-linking agent under a heating condition to obtain the deep eutectic electrolyte. The deep eutectic gel polymer electrolyte is obtained. The invention provides a novel high-safety electrolyte which is suitable for a lithium ion battery system and a sodium ion battery system.

This invention relates to the field of novel energy storage materials, specifically to an ultra-high capacity tellurium-based material with a six-electron conversion mechanism and its manganese ion storage application. The material system of this invention includes a tellurium-based active material as the working electrode and an ion transport medium adapted to it; wherein the tellurium-based active material is a composite material of tellurium and carbon-based materials; the ion transport medium is a hydrated eutectic system, including manganese salt, hydrogen bond donor water, and hydrogen bond acceptor succinate. This invention successfully activates the deep six-electron conversion reaction (Te6000) of the tellurium-based material in an aqueous environment. 2‑ ↔Te 4+ This breakthrough overcomes the capacity bottleneck of traditional four-electron reactions. The material system not only exhibits excellent conductivity but also demonstrates ultra-high specific capacity and excellent cycle stability, providing a novel material solution for constructing high-specific-energy storage devices.

The invention discloses a synthesis method of amber ether and a used catalyst. According to the synthesis method, cyclododecanol and diethoxymethane are used as raw materials, and an acetal exchange reaction is performed in the presence of a catalyst to obtain the amber ether, the catalyst is prepared by the preparation method comprising the following steps: 1) carrying out hydrothermal reaction on a silicon source in an acid solution in the presence of a polymer template agent, a surfactant and inorganic salt, and removing the polymer template agent and the surfactant to obtain mesoporous silica microspheres; and 2) carrying out a sulfonation reaction on the mesoporous silica microspheres and concentrated sulfuric acid to obtain the catalyst, the inorganic salt being zinc chloride, and the molar concentration of the acid solution being 1.5-8 mol / L. The synthesis method can realize high conversion rate of raw materials and high selectivity of the target product amber ether, and is suitable for industrial production.

The invention discloses a lithium iron phosphate energy storage battery manufacturing process, and belongs to the technical field of battery manufacturing processes. The process specifically comprises the following steps: preparing a positive electrode material through in-situ coating of a low-cobalt-doped iron source precursor, sintering in a nitrogen atmosphere to obtain a low-cobalt-doped positive electrode material, carrying out hot press molding on the positive electrode material to prepare a pressed sheet, and cutting the pressed sheet through laser cutting to obtain a positive plate; next, an electrolyte is prepared, the electrolyte comprises a basic electrolyte component and an additive, and the additive comprises 1.5 wt% of fluoroethylene carbonate and 0.5 wt% of succinonitrile; according to the manufacturing process of the lithium iron phosphate energy storage battery, the thermal runaway trigger temperature can be increased, the thermal runaway inhibition time can be prolonged, and the cobalt consumption and the material cost can be reduced.

The invention belongs to the field of organic chemical synthesis, and relates to a process for preparing butanediamine by using acrylonitrile and hydrocyanic acid through a one-pot method, which comprises the following steps: placing acrylonitrile, hydrocyanic acid, a hydrocyanation catalytic component and a hydrogenation catalytic component in the same reactor, and reacting in a nitrogen atmosphere, the preparation method comprises the following steps: carrying out a hydrocyanation addition reaction on acrylonitrile and hydrocyanic acid under the action of a hydrocyanation catalytic component to generate a succinonitrile intermediate, adding hydrogen into a reaction system for boosting without separation treatment, carrying out a catalytic hydrogenation reaction under the action of a hydrogenation catalytic component, and carrying out separation treatment to obtain butanediamine. According to the method, two-step reaction is integrated into a single reactor and intermediate separation is avoided, so that the process is fundamentally simplified, the equipment investment and the operation cost are reduced, meanwhile, the material loss caused by unstable intermediates is reduced, the production efficiency and the total yield of products are improved, and the method is suitable for industrial production. And the transfer of toxic materials is reduced, so that the process safety is improved.

The invention discloses a PEO / garnet type solid-state composite electrolyte prepared by using a plasma technology, and a preparation method and application thereof, and belongs to the technical field of solid-state batteries. The method comprises the following steps: dissolving PEO, lithium salt, succinonitrile and garnet type solid electrolyte filler in an organic solvent to form a precursor solution; placing the solution in plasma equipment; under the vacuum and low-temperature conditions, gas excitation liquid is introduced, plasma is excited, a precursor is treated for a short time, and thorough removal of an organic solvent and in-situ cross-linking curing of a PEO matrix are achieved in one step. According to the invention, the dual effects of the plasma technology are utilized, the problems of solvent residue and uneven filler dispersion in the traditional method are fundamentally solved, and the prepared composite electrolyte has high ionic conductivity, high lithium ion transference number and excellent lithium metal stability. The method is simple in process, efficient and energy-saving, is suitable for preparing a high-performance solid-state battery, and has a wide industrial application prospect.

The invention discloses a sodium-based ion eutectic solid electrolyte and an application thereof in a high-performance sodium metal battery, and belongs to the field of electrochemical energy storage. The electrolyte is formed by cocrystallizing sodium perchlorate and succinonitrile according to a molar ratio of 1: (2.6-3.2); an ordered-disordered coexisting crystal structure is constructed on the molecular scale: Na < + > and part of SN molecules and ClO4 <-> respectively occupy regular coordination skeleton sites, and extra SN molecules fill lattice gaps in an orientation disordered manner, so that a continuous three-dimensional sodium ion transmission channel is established, and anions are effectively fixed; naClO4 (SN) x can be subjected to in-situ fusion-infiltration-resolidification after the battery is assembled, electrode pores and interface gaps are fully filled, interface impedance is reduced, collaborative optimization of ion migration efficiency and interface compatibility is realized through eutectic structure design and an in-situ fusion process, and the performance of the battery is improved. The invention provides a solid electrolyte solution for safe and efficient operation of the sodium metal battery, and has a wide application prospect.

A single-layer dielectric thin film with ceramic particles embedded in organic material in a battery structure; wherein a solid or semi-solid lithium battery comprises a negative electrode, a positive electrode, and the dielectric thin film layer connected between the negative electrode and the positive electrode; A dielectric thin film comprising: A polymer material as a base material for the dielectric thin film consisting of a mixture of PVDF-HFP (polyvinylidene fluoride hexafluoropropylene copolymer), HNBR (hydrogenated nitrile butadiene rubber) and SN (succinonitrile); The SN in the polymer material acts as a plasticizer. The SN added to the PVDF-HFP disperses the polymer structure and reduces its crystallization. The SN dissociates the lithium salts of the dielectric thin film and promotes ionic conductivity. Lithium salts dispersed in the polymer material lower the energy level of the lithium ions transferred in the polymer material and increase their stability and conductivity. A variety of ceramic composite particles dispersed in the polymer material increase the ionic conductivity and strength of the dielectric thin film, with each of the ceramic composite particles comprising the following: A ceramic particle with high lithium-ion conductivity serves to guide and distribute the lithium ions as they pass through the dielectric thin film. This allows the ceramic particle to form uniformly distributed lithium-ion channels within the dielectric thin film. A dopamine layer surrounds the outer surface of the ceramic particle, thus forming the first particle. The dopamine layer consists of several copolymerized dopamine molecules. A PVDF (polyvinylidene fluoride) layer surrounds the outside of the first particle. wherein the composite ceramic particles are dispersed in the polymer material; the lithium salts added to the polymer material serve to increase the conductivity of the lithium ions and the density of the lithium ions.

The invention discloses a butanedinitrile-based electrolyte additive composition, an electrolyte and a lithium ion battery, and belongs to the technical field of lithium ion batteries, the butanedinitrile-based electrolyte additive composition comprises butanedinitrile and a functional additive, and the molecules of the functional additive contain Si-O bonds; cyano groups in succinonitrile are complexed with transition metal ions, so that the high-temperature storage performance is improved, but a negative electrode interface can be deteriorated to cause cyclic diving; the structure of the functional additive contains Si-O bonds, the functional additive can spontaneously hydrolyze and polycondense, efficiently capture HF and form Si-F bonds, corrosion of HF to the surface of the positive electrode is reduced, meanwhile, the functional additive can preferentially form a film at the negative electrode, contains a large number of F atoms, the film forming quality is more excellent, and the damage of the functional additive to a negative electrode interface is reduced while the consumption of succinonitrile is reduced, so that the cycle performance is improved. Compared with single butanedinitrile, the functional additive can show obvious superiority under the high-temperature-resistant application condition, so that the butanedinitrile-based electrolyte additive composition can effectively improve the high-temperature performance of the battery and improve the capacity fading in the cycle process.