328 results about "Vinylene carbonate" patented technology

The invention provides a non-aqueous electrolyte, a lithium ion battery, a battery module, a battery pack and a power utilization device, the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an electrolyte additive, and the electrolyte additive comprises 1, 3-propane sultone, fluoroethylene carbonate, vinylene carbonate, lithium tetrafluoroborate and a compound I shown in the formula I. The non-aqueous electrolyte is applied to the lithium ion battery, and the cycle life of the lithium ion battery is prolonged.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive active material layer, and the positive active material layer comprises lithium-containing phosphate of an olivine structure; the electrolyte comprises, by mass, 8-30% of a carboxylic ester solvent, a lithium salt and an unsaturated ester additive, the lithium salt comprises lithium hexafluorophosphate and fluorine-containing lithium sulfimide, the mass content of the fluorine-containing lithium sulfimide in the lithium salt is 18-45%, the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%, and the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%. The unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive; the amount of electrolyte in the battery cell is 2.8 g / Ah to 3.2 g / Ah. According to the invention, rapid charging and use reliability of the single battery can be considered.

The invention discloses an electrolyte, an electrochemical device comprising the electrolyte and a vehicle. The electrolyte comprises a solvent, a first additive and a second additive, the solvent comprises chain carboxylic ester, and the first additive comprises a sulfonate compound or / and a sulfate compound; the second additive comprises vinylene carbonate or / and fluoroethylene carbonate. According to the electrolyte disclosed by the invention, the chain carboxylic ester solvent, the first additive containing the sulfonate compound or / and the sulfate compound and the second additive containing the vinylene carbonate or / and the fluoroethylene carbonate are matched for use; the rapid charging capability and the high-temperature cycle performance of a lithium iron phosphate system battery with high safety performance can be improved, and the application of lithium iron phosphate in a power battery is further widened.

The invention relates to a preparation technology of a gel polymer lithium ion battery cell electrolyte, and belongs to the field of battery preparation technologies, the preparation technology comprises the following steps: mixing methacrylate monomers and silane monomers according to a mass ratio of 3: 1-5: 1, adding 1-3% of an initiator, and carrying out prepolymerization at 60-80 DEG C for 1-3 h to prepare a prepolymer solution; mixing with a non-aqueous solvent containing lithium hexafluorophosphate according to a mass ratio of (1: 4)-(1: 6) to form a precursor mixed solution, and controlling the injection rate to be 1.5-2.5 g / Ah to a gap between a battery cell pole piece and a diaphragm; after standing for 2-4 hours at the vacuum degree of less than or equal to-0.08 MPa, curing for 3-6 hours at the temperature of 60-70 DEG C to form a gel polymer electrolyte; the wettability is improved through pole piece surface hydrophilic treatment, 1-5% of vinylene carbonate is added to optimize an SEI film, the prepolymerization temperature fluctuation is controlled to be smaller than or equal to + / -2 DEG C through microwave-assisted heating, the pressure of 0.2-0.5 MPa is applied after injection to promote uniform permeation, a polyvinylidene fluoride coating of 5-10 microns is coated after curing to enhance protection, and the interface performance is ensured through an alternating-current impedance test.

Secondary battery, including a positive electrode sheet comprising a positive electrode current collector and a positive electrode film layer, wherein the positive electrode film layer is arranged on at least one side of the positive electrode current collector and the positive electrode film layer comprises a positive electrode active material; a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer, wherein the negative electrode film layer is arranged on at least one side of the negative electrode current collector and the negative electrode film layer comprises a negative electrode active material, wherein the negative electrode active material comprises graphite and the powder compaction density of the negative electrode active material at 20,000 N is 1.5 g / cm³ 3 up to 1.85 g / cm³ 3 is; and an electrolyte comprising an organic solvent and an organic additive, wherein the organic solvent comprises a first solvent, the first solvent comprising cyclic carbonate, and the mass fraction of the first solvent, based on the total mass of the electrolyte, is 17% to 34%; wherein the organic additive comprises a first and a second additive, the first additive comprising vinylene carbonate and the second additive comprising an ethylene carbonate derivative, and the mass fraction of the first additive is 1.5% to 8% and the mass fraction of the second additive is 0.5% to 4%, each based on the total mass of the electrolyte.

The embodiment of the invention provides an electrolyte, a battery and electric equipment, the electrolyte comprises a lithium salt, an organic solvent and a polymer matrix, and monomers of the polymer matrix comprise vinylene carbonate and isocyanate ethyl acrylate. In the electrolyte provided by the embodiment of the invention, the monomers of the polymer matrix comprise vinylene carbonate and isocyanate ethyl acrylate, and the low HOMO energy level of isocyanate ethyl acrylate can weaken the electron loss ability of the polymer matrix and improve the oxidation stability of the electrolyte, so that the relatively poor electrochemical stability is improved; and a copolymerization structure of vinylene carbonate and isocyanate ethyl acrylate reduces the crystallinity of a polymer matrix and provides a smoother path for Li < + > transmission, so that the ionic conductivity of the electrolyte is improved. Therefore, the electrolyte provided by the invention can effectively improve the problems of low room-temperature ionic conductivity and relatively poor electrochemical stability of the existing gel electrolyte, and has a good application prospect.

The invention relates to a continuous production process and device of vinylene carbonate, chloroethylene carbonate, tertiary amine and a solvent are continuously fed in a reactor for dechlorination reaction, and temperature is controlled by a tubular heat exchanger; the reaction liquid continuously overflows from a side overflow port to enter a middle receiving tank, a vinylene carbonate crude product is obtained after desolvation, the vinylene carbonate crude product enters a melt crystallizer for melt crystallization after being purified by a low-component removal tower, a high-component removal tower and a rectifying tower, and a vinylene carbonate product with the purity of 99.99% or above is obtained; a reaction by-product tertiary amine hydrochloride settles to the lower part of the reactor, is discharged from the bottom of the reactor after being subjected to countercurrent washing by inputting a solvent through a salt leaching cavity, enters a neutralization kettle, is neutralized by liquid caustic soda and then is subjected to liquid separation, an organic phase enters a recovery system to be dehydrated, and then sequentially passes through a solvent recovery tower to recover the solvent and a tertiary amine recovery tower to recover tertiary amine; and the solvent and the tertiary amine can be recycled. The continuous production of the vinylene carbonate is realized, the consumption of raw materials is reduced, and the yield and the production efficiency are improved.

The invention relates to the technical field of battery diaphragm preparation, in particular to a lithium ion battery diaphragm and a preparation method thereof.The lithium ion battery diaphragm comprises a diaphragm base material and modified slurry coating the surface of the diaphragm base material; a preparation method of the modified slurry comprises the following steps: adding the modified conductive polymer, the modified graphene and the vinylidene fluoride polymer into N-methyl pyrrolidone, uniformly stirring, adding vinylene carbonate, and fully stirring to obtain the modified slurry. The preparation method of the lithium ion battery diaphragm comprises the following steps: coating the modified slurry on the surface of the diaphragm base material, and flattening and curing to obtain the lithium ion battery diaphragm. The lithium ion battery diaphragm prepared in the invention has good thermal stability, can keep a stable structure in a normal working temperature range of a battery, has excellent air permeability, good diaphragm electrolyte wettability, reduced resistance, improved ionic conductivity, good capacity retention rate after long-term use, and is more durable.

The invention discloses a lithium manganese iron phosphate secondary battery and device, and relates to the technical field of lithium manganese iron phosphate batteries. The lithium manganese iron phosphate secondary battery comprises an electrolyte and a positive pole piece, wherein the positive pole piece comprises a lithium manganese iron phosphate positive pole material; the electrolyte comprises an additive and an organic solvent, the additive comprises vinylene carbonate, and the mass of the vinylene carbonate accounts for 0.8%-1.7% of the total mass of the electrolyte; the organic solvent comprises ethylene carbonate, and the mass of the ethylene carbonate is 10-19% of the total mass of the electrolyte; the mass content of the fluorine element in the electrolyte is 7.5%-12.75%; the mass content of fluoroethylene carbonate in the electrolyte is less than 10 ppm, and the mass content of boron is less than 10 ppm. According to the invention, the contents of vinylene carbonate, ethylene carbonate and total fluorine element in the electrolyte are accurately controlled, and meanwhile, the contents of fluoroethylene carbonate and boron element are strictly limited to be less than a preset threshold value, so that the dissolution of manganese ions is effectively inhibited, and the cycle life of the battery at high voltage and high temperature is remarkably prolonged.

The invention relates to the field of batteries, and provides an electrolyte additive, an electrolyte and a battery. The electrolyte additive comprises a siloxane compound, vinylene carbonate and fluoroethylene carbonate, the siloxane compound is at least one of compounds as shown in a formula 1, in the formula 1, m represents any integer from 1 to 12, R1, R2 and R3 are the same or different and are independently C1-C8 alkyl groups, C1-C8 alkoxy groups and the like, and one or two of R1, R2 and R3 are C1-C8 alkoxy groups. The electrolyte additive can improve the electrochemical performance of the battery. # imgabs0 #

The invention relates to the technical field of lithium battery electrolyte, in particular to a composite enhanced solid electrolyte membrane and a preparation method thereof. The polymer solid electrolyte is a polycarbonate-based solid electrolyte such as a poly (ethylene carbonate)-based solid electrolyte PVC, a poly (vinylene carbonate)-based solid electrolyte PEC, a poly (propylene carbonate)-based solid electrolyte PPC, a poly (propylene carbonate)-based solid electrolyte PTMC and a polyoxyethylene-based solid electrolyte. The electrolyte is one or more of polysiloxane-based polymer electrolyte and single-lithium-ion conductive polymer electrolyte materials. The composite enhanced solid electrolyte membrane is disclosed. The preparation method comprises the following steps: preparing the three-dimensional nanofiber skeleton through electrostatic spinning, loading the two surfaces of mixed slurry of the polymer electrolyte and the lithium salt on the base membrane in an inert atmosphere, and carrying out vacuum curing molding. The composite membrane has high safety and a wide electrochemical window, the process of the composite membrane is compatible with an existing lithium battery production line, the raw material cost is controllable, and the composite membrane has large-scale commercial application potential.

The invention discloses a sodium ion battery electrolyte and a sodium ion battery, the preparation raw materials of the electrolyte comprise an electrolyte, an organic solvent and a composite additive, the preparation raw materials of the electrolyte comprise a sodium salt and modified graphite, the preparation raw materials of the modified graphite comprise graphite, dopamine hydrochloride, polyethyleneimine, Sb2O3 and BiCl3, the composite additive is prepared from trimethylsilyl trifluoromethanesulfonate, N-methyl pyrrolidone, vinylene carbonate and nano silicon dioxide. Through synergistic compounding, a high-stability three-dimensional ionic conduction network is constructed, so that the electrolyte has a wide electrochemical window and high ionic conductivity.

Disclosed in the present invention is a preparation method for vinylene carbonate. Specifically, the preparation method of the present invention comprises the following steps: introducing a material containing chloroethylene carbonate into a reaction bed layer containing a catalyst to perform a contact reaction, so as to obtain vinylene carbonate, wherein the catalyst is prepared by means of the following method: performing forming by using a catalyst raw material, then optionally calcining same, and then cooling same, so as to obtain catalyst particles. The preparation method of the present invention has a low cost, is easy to operate, has a high conversion rate and a high yield and is beneficial to industrial production.

This application provides a lithium battery and a power vehicle. The lithium battery combines lithium transition metal oxide with LiFe... 1‑a Mn a PO4 material is used as the positive electrode active material, and LiFe is added. 1‑a Mn a The mass ratio of PO4 material is related to the content of vinylene carbonate in the battery electrolyte, the discharge capacity and DC internal resistance of the battery at 0.33C discharge at 25℃, and the content of Fe dissolved into the negative electrode material after high-temperature cycling. These factors are then made to meet certain conditions to ensure that the battery can achieve both good low-temperature rate performance at 0℃ and high-temperature cycling performance.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, an isolating membrane and a negative pole piece, and the positive pole piece comprises lithium-containing phosphate with an olivine structure; the electrolyte comprises a linear carboxylic ester solvent, a cyclic carbonate solvent and an additive, wherein the viscosity of the linear carboxylic ester solvent at normal temperature is 0.4 mPa.s to 0.6 mPa.s; the cyclic carbonate solvent comprises at least one of ethylene carbonate and propylene carbonate; the additive comprises at least one of a borate additive, a sulfonate additive, a silane-based additive and an unsaturated ester additive, and the unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive. And the mass content of the additive in the electrolyte is 0.5-6%. According to the invention, rapid charging and use reliability of the battery can be considered.

The invention discloses a vinylene carbonate production waste treatment method, which comprises: dispersing triethylamine hydrochloride waste residue in water, filtering, adding excess alkali into the filtrate to carry out an alkaline hydrolysis reaction, and standing for layering to obtain an oil phase and a water phase, the oil phase containing triethylamine; adding calcium peroxide into the water phase, mixing and stirring to obtain a pretreatment solution; performing electrochemical catalytic oxidation treatment on the pretreatment solution, wherein a graphite felt electrode modified by a specific iron-based activated carbon catalyst is used as a cathode in the electrochemical catalytic oxidation treatment; the method is simple to operate, easy to implement, high in continuity, low in cost, free of high-temperature and high-pressure processes and excellent in treatment effect.

The invention relates to a battery which comprises a positive plate, a negative plate, a diaphragm and an electrolyte, a positive active material layer in the positive plate comprises a positive additive, a boron-containing additive and / or a phosphorus-containing additive; the boron-containing additive has a structure as shown in a formula 1, and R1-R4 are independently selected from at least one of halogen atoms, C1-C4 alkyl groups, oxalate groups, substituted or unsubstituted diester groups, substituted or unsubstituted phosphate groups, cyano groups, substituted or unsubstituted ester groups, substituted or unsubstituted phenyl groups, substituted or unsubstituted pyridine groups and substituted or unsubstituted silicon groups; substituent groups of the diester group, the phosphate group, the ester group, the phenyl group, the pyridine group and the silicon group comprise at least one of methyl and halogen atoms; and a negative active material layer in the negative plate comprises a negative additive which comprises vinylene carbonate and lithium difluoro (oxalato) borate. According to the scheme provided by the invention, the battery can present excellent safety performance, rate capability and cycle performance.

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

Systems and methods are provided for using electrolytic compositions in lithium ion batteries. In one example, an electrolytic composition may include vinylene carbonate, fluoroethylene carbonate, 1,3-propane sultone, ethylene sulfite, and a conducting salt including no less than 80 mol % of lithium bis(fluorosulfonyl)imide. In this way, a capacity retention of the lithium ion battery may be maintained, such as during high-temperature storage at 100% state of charge.

The present application relates to a battery cell, a battery device and an electrical device. The battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode tab and a negative electrode tab. The positive electrode tab includes a positive current collector portion and a positive electrode film layer, and the positive electrode film layer includes a lithium-containing phosphate with an olivine structure. The negative electrode tab includes a negative current collector portion and a negative electrode film layer, and the negative electrode film layer includes a carbon-based material. The electrolyte includes a carboxylate solvent, a first additive and lithium fluorosulfonimide. The mass content of the carboxylate solvent is 8% to 60%. The total mass content of the first additive is 2.5% to 10%. The first additive includes 1,3-propane sultone with a mass content ≥0, a derivative of ethylene carbonate with a mass content ≥0, and vinylene carbonate with a mass content >0. The derivative of ethylene carbonate includes the compound shown in Formula A. The mass content of lithium fluorosulfonimide is 4% to 8%. The present application can improve the fast charging performance and cycling performance of the battery cell. #imgabs0# Formula A.

Lithium secondary battery, comprehensive a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte, wherein: the positive electrode comprises a positive electrode active material, wherein the positive electrode active material comprises lithium iron phosphate particles and the positive electrode has a loading amount of 450 mg / 25 cm² 2 up to 740 mg / 25 cm 2 exhibits; and the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises a solvent based on a cyclic carbonate and a solvent based on a linear carbonate, wherein the solvent based on a cyclic carbonate comprises ethylene carbonate and the solvent based on a linear carbonate comprises dimethyl carbonate, the additive comprises vinylene carbonate and the dimethyl carbonate is present in an amount of 5 vol% to 75 vol% in the organic solvent and the weight ratio of vinylene carbonate to dimethyl carbonate is greater than 0 to 0.2 or less.

The invention discloses an acetonitrile electrolyte and a sodium ion battery thereof, and aims to provide an electrolyte which not only can keep the advantage of high conductivity of acetonitrile and widen the electrochemical window of the electrolyte, but also can be well compatible with a positive electrode and a negative electrode to form a stable interface. The invention also provides a sodium ion battery capable of improving the rate capability of the acetonitrile electrolyte and realizing ultrafast charge. The acetonitrile electrolyte comprises a solvent acetonitrile, wherein a composite film-forming agent, NaPF6 and NaClO4 are added into the acetonitrile; the mass ratio of the acetonitrile to the composite film forming agent to the NaPF6 to the NaClO4 is 100: (2 to 5): (17.1 to 20.3): (0.78 to 3.11); the composite film-forming agent is composed of vinylene carbonate and ethylene sulfate; belongs to the technical field of sodium-ion batteries.

The present invention relates to the field of lithium-ion battery technology, and more particularly to an electrolyte, a preparation method thereof, an injection method, and a lithium-ion battery. The electrolyte comprises a first electrolyte for a first injection and a second electrolyte for a second injection. The first electrolyte comprises a first solvent, a first lithium salt, and a first additive, and the second electrolyte comprises a second solvent, a second lithium salt, and a second additive. The second electrolyte accounts for 5% to 20% of the electrolyte by mass, the first additive comprises dimethyl sulfide and vinylene carbonate, and the second additive comprises triphenyl phosphite and vinylene carbonate. By including dimethyl sulfide in the first additive and triphenyl phosphite in the second additive, the electrolyte improves the problems of high-temperature gassing and black spots at the negative electrode interface during use of lithium-rich material lithium supplements.

An electrolyte for a battery cell, a battery cell for a vehicle and a method of forming a battery cell. The electrolyte includes a combination of lithium ion salts including lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide, and lithium difluoro(oxalato)borate. The electrolyte also includes a carbonate solvent including fluoroethylene carbonate, ethyl methyl carbonate, and a carboxylic acid ester exhibiting the following formula:wherein R1 and R2 are individually an unsubstituted alkyl group including in the range of 1 carbon to 2 carbons, wherein the combination of lithium ion salts is dispersed in the carbonate solvent. The electrolyte further includes vinylene carbonate. The electrolyte does not include ethyl carbonate.

A lithium-ion battery electrolyte includes LiPF6 and an organic compound composition. The organic compound composition includes (1) vinylene carbonate (VC), (2) fluoroethylene carbonate (FEC), and (3) at least one ester (ES). A mole fraction of the LiPF6 in the electrolyte is approximately c(LiPF6) mol. %. A mole fraction of the VC in the electrolyte is approximately c(VC) mol. %. A mole fraction of the FEC in the electrolyte is approximately c(FEC) mol. %. A mole fraction of the ES in the electrolyte is approximately c(ES) mol. %. In some embodiments, the mole fractions c(LiPF6), c(VC), c(FEC), and c(ES) satisfy the following relations:8≤c(LiPF6)≤16;0.5≤c(VC)≤5;10≤c(FEC)≤26; and40≤c(ES)≤75.

The utility model relates to a rectifying tower, in particular to a vinylene carbonate heavy component increasing and purifying rectifying tower. Comprising a VC crude product feeding tank, a scraper evaporator, a VC light component removal tower, a VC heavy component removal tower and a VC purification tower which are sequentially connected through a pipeline, the VC crude product feeding tank is used for storing a VC material crude product, the scraper evaporator is used for removing heavy component impurities in the VC material crude product through coarse distillation, the VC material subjected to coarse distillation enters the VC light component removal tower, the VC light component removal tower is used for removing light component impurities in the VC material, and the VC purification tower is used for purifying the VC material. The VC material after light component removal enters the VC heavy component removal tower, the VC heavy component removal tower performs heavy component removal to produce a VC product, and the VC purification tower is used for purifying heavy component impurities of the VC material removed by the VC heavy component removal tower. Through the purification tower and related equipment, heavy component materials are independently distilled, the recovery rate is increased, the operation cost is reduced, and maximum-efficiency recovery of products is realized.

The invention discloses a positive pole piece and a preparation method thereof, a diaphragm-free battery and a battery. The positive pole piece comprises a positive pole current collector and a positive pole active material layer arranged on at least one side of the positive pole current collector, the positive pole active material layer comprises a polymer, and the polymer is formed by polymerizing at least one of small molecules of the following raw material components: vinylethylene carbonate, vinylene carbonate, 2, 3, 4-trimethyl-1, 3-pentanedione, 2, 3, 4-trimethyl-1, 3-pentanedione and 2, 3, 4-trimethyl-1, 3-pentanedione. The adhesive is prepared from 2, 4-hexadienoic acid, allyl trifluoroacetate, diethyl allylmalonate, allyl methacrylate, allyl chloroformate, allyl phenylacetate, allyl acetate, allyl 4-hydroxybenzoate and allyl phenoxyacetate. The adhesive is prepared from the following raw materials: 1, 4-hexadienoic acid, allyl trifluoroacetate, diethyl allylmalonate, allyl methacrylate, allyl chloroformate, allyl phenylacetate, allyl acetate, allyl 4-hydroxybenzoate and allyl phenoxyacetate. The positive pole piece provided by the invention comprises the polymer, so that the interface impedance can be reduced, and the rate capability of the battery can be improved.

The application provides a preparation method of fluoroethylene carbonate, comprising the following steps: introducing anhydrous hydrogen fluoride into a mixed system of vinylene carbonate and a catalyst to obtain fluoroethylene carbonate; and the catalyst is selected from hydrofluoric acid salts of organic bases. The preparation method of the application uses vinylene carbonate and anhydrous hydrogen fluoride as raw materials, does not need to add a reaction solvent, and can prepare fluoroethylene carbonate under mild conditions with high yield under the catalysis of a small amount of hydrofluoric acid salts of organic bases.

The invention discloses a new lithium battery material and a preparation method thereof, and relates to the technical field of lithium ion batteries, the new lithium battery material comprises an electrolyte, and the electrolyte comprises a solvent, a composite lithium salt and a functional additive; the solvent comprises fluoro-carbonate, ionic liquid and fluoro-ether; the composite lithium salt comprises lithium bis (fluorosulfonyl) imide (LiFSI), lithium bis (trifluoromethyl) sulfonyl imide (LiTFSI) and lithium bis (oxalato) borate (LiBOB); the functional additive comprises silane modified vinylene carbonate and tris (trimethylsilyl) phosphate. The composite lithium salt is matched with the functional additive and the solvent, so that the battery has relatively good discharge performance and cycle performance in a temperature range of-30 DEG C to 70 DEG C, and has good wide-temperature applicability.

The embodiment of the application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises: a shell, the shell comprising a shell body, a positive electrode end cover assembly and a negative electrode end cover assembly; an electrode assembly, the electrode assembly comprising a positive electrode sheet and a negative electrode sheet, and the electrode assembly is a laminated structure; the electrode assembly comprises a main body part and a tab part located at an end face of the main body part, and a size of the main body part in a first direction is greater than 400 mm; a single surface area density of a positive electrode film layer of the positive electrode sheet is greater than 375 mg / 1540.25 mm 2 ; an electrolyte, the electrolyte comprising a lithium salt and an additive; the lithium salt comprising at least one of lithium hexafluorophosphate and lithium bisfluorosulfonylimide; the additive comprising at least one of vinylene carbonate and a silane additive; and a mass content of the lithium salt is 14% to 20% and a mass content of the additive is 2% to 5% based on a total mass of the electrolyte. The battery monomer provided by the application considers both high energy density and fast charging long service life.