581 results about "Lithium hexafluorophosphate" patented technology

The invention provides a lithium ion battery and electric equipment, the lithium ion battery comprises a positive pole piece and an electrolyte, active substances in the positive pole piece comprise a phosphate lithium positive pole material and nickel cobalt manganese lithium oxide, and the electrolyte comprises a positive pole film-forming agent, a negative pole film-forming agent and a lithium salt, the lithium salt comprises lithium hexafluorophosphate and lithium bis (fluorosulfonyl) imide, the lithium ion battery meets the following formula: # imgabs0 #, NL is the mass ratio of the lithium nickel cobalt manganese oxide to the lithium phosphate positive electrode material, Salt is the sum of the molar concentrations of the lithium hexafluorophosphate and the lithium bis (fluorosulfonyl) imide in the electrolyte by taking mol / L as the unit, and the sum of the molar concentrations of the lithium hexafluorophosphate and the lithium bis (fluorosulfonyl) imide in the electrolyte is the sum of the molar concentrations of the lithium hexafluorophosphate and the lithium bis (fluorosulfonyl) imide. Add is the mass ratio of the positive electrode film-forming agent to the negative electrode film-forming agent. When the ternary material is doped in the lithium manganese iron phosphate or the lithium iron phosphate, the proportion of the positive and negative electrode film-forming agents and the proportion of the heat-resistant high-lithium salt can be adjusted according to the mixing proportion of the lithium manganese iron phosphate and the lithium iron phosphate, so that the cycle performance of the battery is improved.

The present application provides a method for recovering waste electrolyte of lithium-ion batteries, wherein the waste electrolyte contains lithium hexafluorophosphate, comprising the following steps: S1: adding a saline solution as an extractant to the collected waste electrolyte for extraction, separating a lower organic solution and an upper aqueous solution, and recovering the lower organic solution to obtain an organic solvent; S2: adding a water-soluble carbonate and / or a water-soluble phosphate to the upper aqueous solution in step S1, filtering, and separating to obtain a lithium precipitate. The recovery method can achieve efficient separation and recovery of organic solvents and lithium elements in waste electrolytes, is simple and easy to operate, is economical and environmentally friendly, has strong applicability, and can be prepared and produced on a large scale.

A non-aqueous electrolyte for a lithium-ion cell includes a base electrolyte consisting of lithium hexafluorophosphate or lithium bis(fluorosulfonyl)imide or a combination thereof in methyl propionate; about 2 to about 15 parts by weight, preferably about 6 to about 15 parts by weight of vinylene carbonate; and about 0.5 to about 5 parts by weight, preferably about 2 to about 5 parts by weight of an additive comprising lithium difluorophosphate, lithium difluoro(oxalate)borate, lithium bis(oxalate)borate, or a combination thereof, wherein the content of the vinylene carbonate and the additive are each based on a total weight of the base electrolyte, the vinylene carbonate, and the additives.

The invention discloses a battery monomer, a battery device and electric equipment, the battery monomer comprises a positive pole piece, the positive pole piece comprises a positive pole film layer, and the positive pole film layer comprises a lithium iron phosphate material and a lithium supplement agent; the negative electrode plate comprises a negative electrode film layer, the negative electrode film layer comprises a negative electrode active material, and the negative electrode active material comprises graphite; the isolating membrane is positioned between the positive pole piece and the negative pole piece; the electrolyte comprises lithium salts, the lithium salts comprise an organic lithium salt and an inorganic lithium salt, the organic lithium salt comprises at least one of fluorine-containing lithium sulfimide, fluorine-containing lithium oxalato borate and fluorine-containing lithium oxalato phosphate, the inorganic lithium salt comprises at least one of lithium hexafluorophosphate, lithium tetrafluoroborate and lithium fluorosulfonate, and the organic lithium salt comprises at least one of fluorine-containing lithium sulfimide, fluorine-containing lithium oxalato borate and fluorine-containing lithium oxalato phosphate. The mass ratio of the inorganic lithium salt to the organic lithium salt is (6-2): 1. As a result, a battery cell having both a long life and high power is obtained.

The embodiment of the invention provides an electrolyte, a battery and a power utilization device, the electrolyte comprises a lithium salt, a first additive and a second additive, the lithium salt comprises lithium hexafluorophosphate, the second additive is lithium fluorosulfonate, and the first additive has a structure as shown in a formula (1). The first additive and the second additive have a synergistic effect, an organic-inorganic composite CEI film is formed on the positive electrode, meanwhile, an inorganic SEI film with high ionic conductivity is formed on the negative electrode, and the CEI film and the SEI film can reduce side reactions between the electrode and an electrolyte, so that damage to the surface structure of the electrode and decomposition gas production of the electrolyte are reduced, and the service life of the electrolyte is prolonged. The cycle performance of the battery is improved; and the inorganic SEI film with high ionic conductivity can improve the transmission rate of conductive ions, so that the power performance of the battery is improved, and the battery has relatively good cycle performance and power performance.

The invention relates to a preparation method of a gel electrolyte with an efficient flame-retardant characteristic. The gel electrolyte is mainly composed of a gel matrix, a flame retardant and an electrolyte solution. The invention provides a method for preparing a flame-retardant gel electrolyte, and application of the flame-retardant gel electrolyte in energy storage equipment such as a lithium ion battery is described in detail. The flame-retardant gel electrolyte has excellent flame retardance, and the safety performance of a battery system can be effectively improved. The preparation method comprises the following specific synthesis steps: (1) firstly, mixing polyethylene oxide (PEO) with a solvent, then adding lithium hexafluorophosphate (LiPF6) electrolyte salt, and uniformly stirring to form a uniform solution; and (2) adding trifluoroethyl methacrylate and a PEGDMA initiator into the solution, carrying out polymerization reaction to form a composite skeleton, and infiltrating the electrolyte under the swelling action to finally form the gel electrolyte. And (3) drying the swelled gel electrolyte to remove redundant solvent and moisture, and then cutting and packaging to obtain the gel electrolyte with high flame retardance. The flame retardance of the electrolyte is remarkably improved by reducing the using amount of the electrolyte and polymerizing and curing the electrolyte.

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 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.

The invention provides a battery monomer, a battery device and electric equipment, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive current collector and a positive active material layer arranged on at least one side of the positive current collector, and the positive active material layer comprises a positive active material; the positive electrode active material comprises lithium-containing phosphate, and the compaction density of the positive electrode plate is 2.46 g / cm < 3 >-2.8 g / cm < 3 >; the negative pole piece comprises a negative current collector and a negative active material layer arranged on at least one side of the negative current collector, and the compaction density of the negative pole piece is 1.25 g / cm < 3 >-1.5 g / cm < 3 >; the electrolyte comprises fluorine-containing lithium sulfimide and lithium hexafluorophosphate, and based on the total mass of the electrolyte, the ratio of the mass ratio of the fluorine-containing lithium sulfimide to the mass ratio of the lithium hexafluorophosphate is 0.4-0.8; and the mass of the electrolyte corresponding to each Ah of the battery monomer is 2.2-3g.

The invention discloses an electrolyte for a lithium manganate lithium ion battery and a preparation method thereof, and the electrolyte comprises the following components in percentage by mass: 70-90% of an organic solvent, 5-20% of a lithium salt and 0.5-10% of an additive, the organic solvent is formed by mixing cyclic carbonate and chain carbonate according to the mass ratio of (10-30): (70-90); the lithium salt adopts one or more of lithium hexafluorophosphate (LiPF), lithium tetrafluoroborate (LiBF) and lithium bis (trifluoromethane sulfonimide) (LiTFSI), and the concentration of the lithium salt is 0.8 to 1.5 mol / L; the additives comprise a manganese ion complexing agent, a film forming accelerant and an antioxidant. In the invention, the manganese ion inhibition effect is as follows: the complexing agent and Mn (II) ions form a stable complex, so that the concentration of free Mn (II) in the electrolyte is reduced by more than 80%, migration and deposition of the free Mn (II) to the negative electrode are inhibited, and the dissolution amount of the Mn element of the positive electrode is reduced by 65% after 500 times of circulation at 45 DEG C.

The invention relates to the technical field of lithium batteries, in particular to a low-temperature electrolyte and a lithium battery containing the low-temperature electrolyte, the low-temperature electrolyte comprises the following components in percentage by mass: 75-85% of solvent, 11-18% of electrolyte salt and 0.5-2% of additive, the electrolyte salt comprises one or more of lithium hexafluorophosphate, lithium difluoro (oxalato) borate, lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethanesulfonyl) imide, and the additive comprises a film-forming agent, a low-temperature reinforcing agent and a dendritic crystal inhibitor. By optimizing the synergistic effect of the solvent system and the electrolyte salt, the freezing point and viscosity of the electrolyte are effectively reduced, the migration rate of lithium ions at low temperature is enhanced, and it is ensured that the battery can still be efficiently charged and discharged under the low-temperature condition.

The invention relates to a high-performance lithium-rich manganese-based lithium ion battery electrolyte with a flame-retardant function and a preparation method thereof, the high-performance lithium-rich manganese-based lithium ion battery electrolyte comprises a lithium salt and an electrolyte organic solvent, the lithium salt is a composite lithium salt, the composite lithium salt comprises lithium hexafluorophosphate and lithium salt additive lithium difluoro (oxalato) borate, and the electrolyte solvent comprises the electrolyte organic solvent and an additive, the additive comprises a positive electrode film-forming additive tris (trimethylsilane) phosphate and a flame-retardant additive ethyoxyl (pentafluoro) cyclotriphosphazene. The electrolyte has the advantages that the electrolyte not only has excellent cycle performance, but also has a flame-retardant function.

The invention discloses a lithium ion battery electrolyte, a preparation method and application. The lithium ion battery electrolyte comprises a lithium salt and an organic solvent, wherein the lithium salt comprises a combination of at least two of lithium hexafluorophosphate, lithium difluoro bis (oxalato) phosphate, lithium bis (fluorosulfonyl) imide and lithium bis (oxalato) borate, and the organic solvent comprises 30 wt%-50 wt% of hydrofluoroether, 10 wt%-30 wt% of acetate and 20 wt%-60 wt% of carbonate. The lithium ion battery electrolyte provided by the invention can keep the diaphragm structure complete, realizes filling of pores with lithium salt, and reduces the permeability of the diaphragm, thereby controlling possible shrinkage of the diaphragm in a temperature change process under a low-temperature or high-temperature condition; the crosstalk problem caused by gas penetration between the positive electrode and the negative electrode is inhibited, and the battery prepared by utilizing the lithium ion battery electrolyte provided by the invention has good cycle performance and rate capability under a low-temperature condition and has relatively high safety under a high-temperature condition.

The invention discloses a lithium hexafluorophosphate production control system and a method thereof, and relates to the technical field of lithium hexafluorophosphate production, and the method specifically comprises the following steps: obtaining crystallization dynamic information of each area in a reaction kettle in a lithium hexafluorophosphate crystallization process in real time, and analyzing after obtaining to obtain a crystallization dynamic result; respectively generating a crystal growth driving force coefficient and a particle uniform distribution index of each region; constructing a particle size distribution evaluation model for the generated crystal growth driving force coefficient and particle uniform distribution index of each region, generating a particle size distribution coefficient of each region, and performing comprehensive analysis after generation to generate an evaluation coefficient; and analyzing the generated evaluation coefficient, and evaluating the uniformity degree of particle size distribution in the reaction kettle in the lithium hexafluorophosphate crystallization process. The problem of uneven particle size distribution in the lithium hexafluorophosphate crystallization process is solved, and the effect of improving the particle size uniformity and the product quality stability is achieved.

A non-woven battery separator and processes for forming the non-woven battery separator includes a fiber blend including cellulose fibers, microfibrillated fibers, and optionally polyester and / or aramid fibers. Also disclosed are batteries including the non-woven battery separator. During fabrication, the non-woven battery separator can be effectively dried at temperatures between 120°C and 180°C, which results in the fibers absorbing water when in use. Some battery electrolytes such as lithium hexafluorophosphate react with water to form hydrogen fluoride (HF), which can be corrosive and shorten battery lifecycles and affect performance. Absorbing water from the electrolyte increases the battery life cycle by reducing HF generation.

The invention belongs to the technical field of electrolyte, and particularly relates to a method for preparing liquid lithium hexafluorophosphate from sodium hexafluorophosphate. The method comprises the following steps: adding a sodium source into a hexafluorophosphoric acid aqueous solution for neutralization reaction to obtain a sodium hexafluorophosphate aqueous solution, then extracting to remove water, drying to obtain a sodium hexafluorophosphate solid, and heating and decomposing the sodium hexafluorophosphate solid to obtain phosphorus pentafluoride gas; the phosphorus pentafluoride gas is not mixed with SO3, POF3, HF and other impurity gases, a complex refining and purifying process is not needed, and the phosphorus pentafluoride gas with the purity exceeding 99.9% can be obtained after simple purification and can be directly used for synthesizing liquid lithium hexafluorophosphate. The method does not generate waste acid, does not need a complicated phosphorus pentafluoride gas purification process, is particularly suitable for the requirements of the lithium battery industry on high-purity electrolyte, and has the remarkable advantages of high product purity, small environmental pollution, low production cost and the like.

The application provides a lithium ion battery and an electric device, the lithium ion battery comprising a positive electrode sheet and an electrolyte, an active substance in the positive electrode sheet comprising a phosphate lithium positive electrode material and a lithium nickel cobalt manganese oxide, the electrolyte comprising a positive electrode film former, a negative electrode film former and a lithium salt, the lithium salt comprising lithium hexafluorophosphate and a lithium bisfluorosulfonylimide salt, the lithium ion battery satisfying the following formula: wherein NL is a mass ratio of the lithium nickel cobalt manganese oxide and the phosphate lithium positive electrode material, S alt is a value of a molar concentration of the lithium hexafluorophosphate and the lithium bisfluorosulfonylimide salt in the electrolyte in mol / L, and A dd is a mass ratio of the positive electrode film former and the negative electrode film former. The application can adjust the ratio of the positive electrode film former and the negative electrode film former and the ratio of the high-heat-resistance lithium salt according to the mixing ratio of the ternary material doped in the lithium manganese iron phosphate or the lithium iron phosphate, so that the cycle performance of the battery is improved.

The invention discloses an electrolyte, a lithium metal battery and an electronic device, and belongs to the technical field of battery materials. The electrolyte comprises lithium salts and an organic solvent, the lithium salts comprise a first lithium salt and a second lithium salt, and the organic solvent comprises fluorocarboxylic ester and fluoroamide; wherein the first lithium salt is selected from at least one of lithium hexafluorophosphate, lithium difluorophosphate, lithium difluoro (oxalato) phosphate, lithium tetrafluoro (oxalato) phosphate and lithium tetrafluoroborate, and the second lithium salt comprises lithium bis (trifluoromethylsulfonyl) imide and lithium difluoro (oxalato) borate in a mass ratio of 1: (1-10). According to the electrolyte, the lithium metal battery can be charged / discharged at-40 DEG C and 0.1 C, the constant-current charging ratio exceeds 80%, and the application field and range of the lithium metal battery are widened.

A novel additive, an electrolyte, and a lithium ion battery, relating to the technical field of lithium ion batteries. The electrolyte comprises a lithium salt and a non-aqueous solvent for dissolving the lithium salt, the electrolyte further comprises an electrolyte additive, the electrolyte additive comprises a positive electrode film-forming additive and a negative electrode film-forming additive, and the electrolyte additive further comprises a fluoro isocyanate-based pyridazine organic compound. The additive can absorb moisture and hydrofluoric acid in the electrolyte, reduce the dissolution of transition metals, improve the thermal stability of lithium hexafluorophosphate, and maintains the stability of a ternary material under high voltage; a sulfuric acid group on the novel additive can be oxidized by oxygen at a positive electrode, so that the oxygen generated when an LFO lithium supplementing agent is activated is absorbed, the capacity exertion, high temperature cycle and high temperature storage of the LFO lithium supplementing agent are significantly improved, and the DCIR of the battery will not obviously increase, thereby improving the stability of the battery.

The present invention provides a synthesis system and a synthesis method for lithium hexafluorophosphate. The synthesis system comprises a gas-liquid reaction kettle and a built-in microbubble generation unit provided in the gas-liquid reaction kettle; a material inlet and a gas inlet are formed in the side wall of the gas-liquid reaction kettle; the built-in microbubble generation unit comprises a first microbubble generator and a second microbubble generator, the first microbubble generator is provided below the liquid level in the gas-liquid reaction kettle and connected to the material inlet, and the second microbubble generator is provided at the bottom end of the gas-liquid reaction kettle and connected to the gas inlet; a plurality of layers of perforated plates are successively provided in the gas-liquid reaction kettle from top to bottom; through holes of said perforated plates are staggered, and said perforated plates are provided between the first microbubble generator and the second microbubble generator. The synthesis system of the present invention increases the area of mass transfer between lithium fluoride liquid and phosphorus pentafluoride gas, increases the reaction rate, and reduces energy consumption.

The present invention belongs to the field of lithium ion batteries, and specifically relates to an in-situ preparation method and a recovery method for a solid polymer electrolyte, as well as a lithium ion battery. The preparation method provided by the present invention comprises the following steps: a) loading an electrolyte precursor onto a surface of a battery separator, and then assembling same with a lithium ion battery positive electrode and a lithium ion battery negative electrode, to obtain a semi-finished lithium ion battery product, components of the electrolyte precursor in step a) comprising a polymer monomer, a lithium salt and an initiator, the lithium salt being lithium perchlorate, lithium hexafluorophosphate, lithium difluorophosphate, or the like; b) under heating conditions, performing in-situ polymerization of the electrolyte precursor on the battery separator in the semi-finished lithium ion battery product, to obtain a solid polymer electrolyte loaded on the battery separator. The preparation method provided by the present invention does not require an additional catalyst, and the prepared solid polymer electrolyte can be depolymerized by means of heating, and has good environmental and economic benefits.

The invention relates to the technical field of lithium ion batteries, relates to a lithium ion battery, and particularly relates to a lithium ion battery with relatively good fast-charge cycle performance and high-temperature storage performance. The lithium ion battery comprises a positive plate, a negative plate and a non-aqueous electrolyte, the positive plate comprises a positive active material, and the positive active material comprises a phosphate compound; the non-aqueous electrolyte comprises a first additive, a lithium salt and a non-aqueous organic solvent; the lithium salt comprises lithium hexafluorophosphate and lithium bis (fluorosulfonyl) imide; the first additive comprises at least one of compounds 1-5, and the solvent comprises a compound as shown in a structural formula 1; the lithium ion battery satisfies the following conditions: 2.8 < = C / (10A + B) + D / 100 < = 14, 0.05 < = A < = 2, 0.5 < = B < = 6, 24 < = C < = 56, and 160 < = D < = 220. The lithium ion battery provided by the invention is high in energy density, and has relatively excellent high-temperature storage performance and fast-charge cycle performance.

A battery cell, a battery, and an electric device. The battery cell comprises a positive electrode sheet, a negative electrode sheet, and an electrolyte; the positive electrode sheet comprises a positive electrode active material layer; the positive electrode active material layer comprises a lithium-containing material of an olivine structure; the negative electrode sheet comprises a negative electrode active material layer; the size of the positive electrode active material layer in the length direction of the positive electrode sheet is L1 mm, the size of the positive electrode active material layer in the width direction of the positive electrode sheet is W1 mm, the size of the negative electrode active material layer in the length direction is L2 mm, the size of the negative electrode active material layer in the width direction is W2 mm, 1<(L2-L1) / (W2-W1)≤4, L2 / L1>1, and 500≤L1≤600; the electrolyte comprises lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide, and based on the total mass of the electrolyte, the ratio of the mass content of the lithium hexafluorophosphate to the mass content of the lithium bis(fluorosulfonyl)imide is greater than 1. The usage reliability of the battery cell can be improved.

The present invention provides a continuous dynamic crystallization device and a crystallization method of lithium hexafluorophosphate, wherein the continuous dynamic crystallization device comprises a precooling device, a pressurized peristaltic device, a continuous oscillation crystallization device and a separation device connected in sequence; the continuous oscillation crystallization device comprises at least two sections of crystallization tubes connected in sequence along the material flow direction, the first section of the crystallization tube is connected to the pressurized peristaltic device, the last section of the crystallization tube is connected to the separation device, and the opening of the first section of the crystallization tube is connected to a piston; wherein, along the material flow direction, the temperature of two adjacent sections of the crystallization tube decreases in sequence. The continuous dynamic crystallization device can realize the dynamic continuous crystallization production of lithium hexafluorophosphate, and can obtain high-purity lithium hexafluorophosphate crystals with uniform particle size distribution and stable output, and continuous operation can also significantly reduce energy consumption and reduce production costs. Continuous dynamic crystallization is easy to realize automatic control, reduce manual intervention, and thus improve the safety and reliability of production.

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, the positive pole piece comprises a positive current collector and a positive active material layer arranged on at least one side of the positive current collector, the negative pole piece comprises a negative current collector and a negative active material layer arranged on at least one side of the negative current collector, the positive active material layer comprises lithium-containing phosphate with an olivine structure, the electrolyte comprises a silane-based additive, and the mass content of the silane-based additive in the electrolyte is 0.05-1%; the electrolyte further comprises lithium salt, the lithium salt comprises lithium hexafluorophosphate, the mass content of the lithium hexafluorophosphate in the electrolyte is 8%-12%, and the total mass content of the lithium salt in the electrolyte is 10%-18%. The use reliability of the battery cell can be improved.

In order to solve the problems of acidity increase and lithium salt consumption in the cycle process of an existing lithium ion battery, the invention provides a non-aqueous electrolyte and a lithium ion battery, the non-aqueous electrolyte comprises a non-aqueous organic solvent, a first lithium salt, a second lithium salt and a first additive, the first lithium salt is lithium hexafluorophosphate, and the second lithium salt is lithium hexafluorophosphate. The second lithium salt comprises at least one of lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethylsulfonyl) imide, the first additive comprises a compound shown in a structural formula 1: # imgabs0, and the non-aqueous electrolyte meets the following conditions: 45 < = sigma * (b + c) < = 220, 0.01 < = a / c < = 0.8, 0.001 < = a < = 1, 2 < = b < = 19, 1 < = c < = 10, and 6 < = sigma < = 13. The non-aqueous electrolyte provided by the invention can keep a low-acidity state after long-term circulation, and can effectively prolong the cycle life of a lithium ion battery when being applied to the lithium ion battery.

The invention provides a lithium ion secondary battery, an electrolyte, a battery cell and an electric device. The lithium ion secondary battery comprises an electrolyte, the electrolyte comprises a lithium salt, a first additive and an organic solvent, the lithium salt comprises lithium hexafluorophosphate, the first additive comprises 1, 3-propene sultone, the organic solvent comprises a first solvent, and the relative dielectric constant of the first solvent is larger than or equal to 30. The lithium ion secondary battery has a relatively high cycle capacity retention rate.

The invention belongs to the technical field of chemical materials, and particularly discloses a method for preparing lithium sulfide, which comprises the following steps: mixing lithium salt and ammonium sulfide for reaction to obtain lithium sulfide; wherein the lithium salt comprises at least one of lithium hexafluorophosphate, lithium difluorophosphate and lithium tetrafluoroborate. According to the method for preparing the lithium sulfide, the lithium salt and the ammonium sulfide can fully react under the mild condition, the reaction time is short, the reaction yield is high, and meanwhile the purity of the obtained lithium sulfide is high.

The invention discloses splitting, shock excitation and separation integrated equipment for lithium hexafluorophosphate-based electrolyte recovery, and relates to the technical field of lithium hexafluorophosphate-based electrolyte recovery, the splitting, shock excitation and separation integrated equipment comprises a conveying table and a sealing cover, the top of the conveying table is provided with the sealing cover, the top of the conveying table is provided with a position control mechanism, and the position control mechanism comprises a track conveying plate arranged at the top of the conveying table; an abutting block is arranged on a second sliding block installed at the top of the rail conveying plate, and transmission columns are symmetrically welded and fixed to the side of the abutting block. By integrating components such as the position control mechanism, the cutting vibration mechanism and the lifting frame, clamping, girdling, vibration separation and heating recovery of the battery are automatically completed, manual intervention is reduced, the overall battery treatment efficiency is improved, meanwhile, low-temperature baking condensation is adopted subsequently, an organic solvent is sublimated or volatilized under strict temperature control, and the battery quality is improved. And the lithium hexafluorophosphate is recycled through a condensing system, so that subsequent separation of the lithium hexafluorophosphate is facilitated.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrolyte and an electrode assembly, the electrode assembly comprises a first pole piece and a second pole piece, the first pole piece and the second pole piece comprise a coating part and a tab part, the tab part is connected to the coating part and extends out of the coating part along the length direction of the battery monomer, and the coating part is connected with the electrolyte. One of the first pole piece and the second pole piece is a positive pole piece, the ratio of the size of the coating part of the positive pole piece in the length direction to the size of the coating part of the positive pole piece in the width direction is larger than 1 and smaller than or equal to 18.5, and the size of the coating part of the positive pole piece in the length direction ranges from 265 mm to 1200 mm; the first pole piece meets the condition that n * W1 / W2 is 0.2 to 1.0; the electrolyte comprises fluorine-containing lithium sulfimide and lithium hexafluorophosphate, and the ratio of the mass content of the fluorine-containing lithium sulfimide to the mass content of the lithium hexafluorophosphate is 0.2-0.8. According to the invention, the high-temperature cycle performance and rapid charging performance of the battery monomer can be improved.