303 results about "Lithium hexafluorophosphate" patented technology

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.

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 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 method for efficiently synthesizing a lithium difluoro bis (oxalate) phosphate solid in a continuous flow reactor, and belongs to the field of environmental protection. The method comprises the following steps: firstly, feeding a lithium hexafluorophosphate solution and a lithium oxalate solution into a static mixing module of a continuous flow reactor for mixing; then entering a reaction module of the continuous flow reactor for reaction; after the reaction is finished, the material enters a separation module of a continuous flow reactor, and after membrane separation, crude lithium difluorobisoxalato phosphate is obtained through a modified ceramic membrane adsorbent; washing the crude lithium difluoro-bis (oxalate) phosphate with absolute ethyl alcohol, and performing vacuum drying to obtain a lithium difluoro-bis (oxalate) phosphate solid; the modified ceramic membrane adsorbent is prepared from an aluminum oxide-zirconium oxide composite ceramic membrane, DMF (Dimethyl Formamide), water, isocyanate 1-trimethoxysilyl methyl ester, 3, 5-dihydroxyphenylboronic acid and stannous octoate. The lithium difluoro-bis (oxalate) phosphate prepared by the method is high in purity and high in yield, and meets the requirements of high-end lithium batteries.

Provided are a battery cell, a battery device, and an electric device. The battery cell comprises a positive electrode sheet and an electrolyte; the positive electrode sheet comprises a positive electrode current collector and a positive electrode active layer located on at least one surface of the positive electrode current collector; the positive electrode active layer comprises a positive electrode active material; the positive electrode active material comprises a lithium-containing phosphate; the single-sided surface density of the positive electrode active layer ranges from 230 mg / 1540.25 mm2 to 400 mg / 1540.25 mm2; the electrolyte comprises a solvent and a lithium-containing electrolyte salt; the solvent comprises a chain carboxylic acid ester and ethylene carbonate; the lithium-containing electrolyte salt comprises one or more of lithium hexafluorophosphate and a fluorine-containing sulfonimide salt; the mass ratio of the lithium-containing electrolyte salt to the ethylene carbonate is 0.29-0.72; and the conductivity of the electrolyte ranges from 13 mS / cm to 20 mS / cm.

The invention discloses a lithium ion battery electrolyte and a lithium ion battery. The lithium ion battery electrolyte comprises an organic solvent, a composite lithium salt and an additive, the composite lithium salt comprises lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide and lithium nitrate; the additive comprises a compound 1. By adopting the low-concentration composite lithium salt and the electrolyte containing the compound 1, the oxygenolysis of the electrolyte is inhibited, the solvation energy of solvated lithium ions is reduced, the kinetics of the electrolyte is improved, and the rate discharge, high temperature and cycle performance of the battery are improved.

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.

To provide a lithium ion battery with improved cycle performance.SOLUTION: The battery comprises an electrolyte and a positive electrode plate, wherein the electrolyte comprises lithium hexafluorophosphate as a lithium salt, and a mass content of the lithium hexafluorophosphate is 15% to 20% of a total mass of the electrolyte, the positive electrode plate comprises a positive current collector and a positive electrode film disposed on at least one side of the positive current collector and comprising a positive active material, and the positive active material comprises a compound having a molecular formula of LidNiaCobMncM (1-a-b-c) Qz; 0 <d ≤ 2.1, 0.6 <a <1, 0 <b <1, 0 <c <1, and 0.6 <a + b + c <1, 1.8 ≤ z ≤ 3.5, the element M includes at least one of B, Mg, Al, Si, P, S, Ca, Sc, Ti, V, Cr, Fe, Cu, Zn, Sr, Y, Zr, Nb, Mo, Cd, Sn, Sb, Te, Ba, Ta, W, Yb, La, and Ce, and the element Q includes at least one of O and F.SELECTED DRAWING: None

To provide an electrolytic solution and a lithium ion battery capable of overcoming a problem that a melting point of the electrolyte solution is high, an ionic conductivity is low, and a performance at low temperature is poor.SOLUTION: An electrolytic solution includes a solvent, a lithium salt, and an additive. The solvent includes a cyclic carbonate, a linear carbonate, and ethyl acetate. The cyclic carbonate includes ethylene carbonate, and the lithium salt includes lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate. A mass percentage of the cyclic carbonate accounts for 5% to 10% of the total amount of the solvent. The mass percentage of the linear carbonate accounts for 20% to 60% of the total amount of the solvent. The mass percentage of the ethyl acetate accounts for 50% to 95% of the total amount of the solvent, and the mass percentage of the lithium bis (fluorosulfonyl) imide accounts for 8% to 20% of the total amount of the electrolytic solution.SELECTED DRAWING: None

This invention proposes a lithium-ion battery electrolyte and its application. The electrolyte comprises at least the following components: a fluorinated solvent, including 2,2-difluoroethyl acetate, fluoroethylene carbonate, and 2,2-difluoroethyl ethyl carbonate; a lithium salt, including a first lithium salt comprising lithium hexafluorophosphate; and an additive, including a first additive comprising lithium difluorobis(oxalato)phosphate. The lithium-ion battery electrolyte and its application proposed in this invention can improve the electrolyte's high-voltage resistance and kinetic performance, reduce battery impedance, and enhance the battery's fast-charging performance and high-temperature cycle stability.

This invention relates to a wide-temperature-range, high-power, low-temperature charge-discharge-cycle-capable starting lithium-ion battery. The invention comprises a positive electrode, a negative electrode, and an electrolyte, characterized in that: the positive electrode is composed of a lithium iron phosphate material body, a conductive agent, carbon nanotubes, a binder, and aluminum foil; the lithium iron phosphate material body is composed of lithium iron phosphate, titanium, and highly conductive carbon; the content of highly conductive carbon is 1.3–2.0%; the negative electrode is composed of artificial graphite, a conductive agent, sodium carboxymethyl cellulose, a binder, and copper foil, with 91–93 parts of artificial graphite, 2–5 parts of conductive agent, 0.5–1.5 parts of sodium carboxymethyl cellulose, and 2–3 parts of binder; the electrolyte is composed of lithium hexafluorophosphate, lithium salt additives, film-forming additives, and a low-melting-point solvent, with the concentration of lithium hexafluorophosphate being above 1.3 mol / L, lithium salt additives being 0.5–9 parts, and film-forming additives being 0.2–3 parts. This invention expands the operating temperature range of lithium-ion batteries to -40℃ to 65℃.

The invention relates to the technical field of chemical machinery, in particular to automatic filtering and drying equipment and method.The automatic filtering and drying equipment comprises a rotary cylinder capable of working in multiple postures, double-layer sleeve fluid conveying assemblies are arranged at the two ends of the cylinder respectively, one end assembly is specially used for liquid phase conveying, central pipe liquid feeding and interlayer liquid discharging, and the other end assembly is specially used for gas / solid phase conveying; the central pipe discharges solid and the interlayer exhausts air, so that thorough isolation of a high-risk liquid phase and a gas / solid phase pipeline is realized on a physical structure, a follow-up heating and control system, an airflow conveying and discharging mechanism and a built-in crushing mechanism are integrated, and full-process automatic closed operation of inverted filtering, rotary drying and upright discharging is realized. The problems of liquid crystallization blockage, sealing failure leakage, danger of manual operation and the like caused by mixed use of pipelines of traditional equipment are fundamentally solved, and the device is particularly suitable for safe and efficient production of lithium hexafluorophosphate and other materials which are high in toxicity, high in corrosion, flammable and explosive, easy to deliquesce and cannot be in contact with air.

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 with an electrode assembly is shown. The electrode assembly has a current collector and a positive active material layer on the current collector. The electrode assembly also has an electrolyte containing lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide in a ratio of 0.8 M to 0.2 M and a fluorinated phosphazene additive at 7 wt.% dissolved in a mixed solvent of ethylene carbonate, ethyl methyl carbonate, and sulfolane in a volume ratio of 25 / 73 / 2. The electrolyte permeates a surface of the positive active material layer to suppress electrochemical oxidation of the positive active material layer.

The application provides a silicon composite negative electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery electrode materials. The method comprises the following steps: vacuum thermal reduction of graphene oxide to obtain graphene nanosheets; mixing of a strong acid and a silicon-based material, while adding the graphene nanosheets, stirring for 5min-60min, and then filtering and washing the turbid liquid to obtain a precipitate; adding lithium hexafluorophosphate into an organic solvent, placing the organic solvent in a sealed container, adding the precipitate and aluminum oxide at 60-180 DEG C, and reacting for 2-10h, and then drying to obtain the silicon composite negative electrode material. The silicon composite negative electrode material has high initial coulomb efficiency and good cycle stability.

The battery comprises a shell, an electrode assembly and an electrolyte, the shell is provided with a containing cavity, and the electrode assembly and the electrolyte are both arranged in the containing cavity; the electrode assembly comprises a negative plate, the dressing amount of the negative plate is W < negative >, and the unit is g; the electrolyte comprises lithium hexafluorophosphate and lithium bis (fluorosulfonyl) imide, the molar concentration of the lithium hexafluorophosphate in the electrolyte is M1, unit mol / L, the molar concentration of the lithium bis (fluorosulfonyl) imide in the electrolyte is M2, unit mol / L, and the volume of the shell is V, unit of the shell is cm < 3 >; wherein (W < negative > / V + 0.38) * (1.43 M1 + 2.6 M2) is greater than or equal to 0.7 and less than or equal to 1.65. The battery has good cycle performance, the risk of thermal runaway or thermal diffusion is low, the safety performance of the battery is high, and the service life is long.

The invention relates to the technical field of lithium batteries, in particular to a modified lithium iron phosphate positive active material, a preparation method thereof and a lithium battery. The modified lithium iron phosphate positive electrode active material comprises a main crystal phase, a conductive second phase dispersed and distributed at the crystal boundary of the main crystal phase, and a carbon coating layer located on the outer surface and coating the main crystal phase and the conductive second phase; the main crystalline phase material is lithium iron phosphate with an olivine structure; the conductive second phase material is lithium vanadium phosphate; the lithium battery disclosed by the invention adopts a modified lithium iron phosphate positive electrode active material which takes LiFeP as a main crystal phase, coexists with an L (P) conductive second phase and is externally coated with a low-content thin carbon layer, and is matched with a high-temperature stable electrolyte containing lithium difluorophosphate and / or lithium difluoro (oxalato) borate, lithium hexafluorophosphate and organophosphate; the problem of considering high rate and high-temperature storage safety of the lithium battery is solved synergistically from two aspects of a material phase structure and an electrolyte.

This invention relates to the field of lithium battery technology and discloses a method for purifying lithium hexafluorophosphate by continuous flow crystallization. The method includes: (1) adding a first organic solvent to crude lithium hexafluorophosphate to dissolve it, preparing a saturated lithium hexafluorophosphate-organic solvent solution, filtering to remove insoluble matter, and obtaining a saturated lithium hexafluorophosphate solution; (2) feeding the saturated lithium hexafluorophosphate solution and the second organic solvent into a microchannel reactor for cooling using metering pumps, filtering the precipitated crystals, washing them with a cooled third organic solvent, and then vacuum drying. The lithium hexafluorophosphate precipitated by the method of this invention has high purity and stable quality, making it very suitable for industrial promotion and application.

The invention relates to the technical field of batteries, in particular to a battery. Comprising a positive plate and electrolyte, the positive plate comprises a positive current collector and a positive coating, the positive coating on the first surface is provided with a plurality of concave parts, and the positive coating on the second surface is provided with a plurality of convex parts; the positive electrode coating comprises a ternary material; the electrolyte comprises lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate, and the mass content of the lithium bis (fluorosulfonyl) imide in the electrolyte is greater than that of the lithium hexafluorophosphate; the electrolyte further comprises 1, 3, 6-hexane trinitrile and lithium difluorophosphate, the mass content C3 of the 1, 3, 6-hexane trinitrile in the electrolyte is larger than or equal to the mass content C4 of the lithium difluorophosphate, and the sum of C3 and C4 is larger than or equal to 0.2% and smaller than or equal to 5%. The electrolyte further comprises fluoro-carboxylic ester, and the mass content C5 of the fluoro-carboxylic ester in the electrolyte is 20%-80%. The battery provided by the invention can effectively improve the problem of folding of the pole piece, and has excellent cycle life and high-temperature safety performance.

The application relates to the technical field of lithium ion batteries, in particular to a lithium ion battery flame-retardant electrolyte and a preparation method and application thereof. The lithium ion battery flame-retardant electrolyte comprises a non-water solvent, a lithium salt, a flame retardant and a bistrifluoromethanesulfonimide salt, the lithium salt is selected from lithium hexafluorophosphate or lithium bisfluorosulfonimide, the flame retardant is fluorinated phosphazene organic matter, the flame retardant accounts for 0.5wt%-20wt% of the total mass of the electrolyte, the lithium ion battery flame-retardant electrolyte provided by the application introduces the bistrifluoromethanesulfonimide salt, the bistrifluoromethanesulfonimide anion has a larger anion radius compared with a bisfluorosulfonimide group, the migration number of lithium ions in the electrolyte is effectively improved, and the rate performance of the battery is improved.

The invention provides a preparation method of lithium hexafluorophosphate with low fluorine emission, and relates to the technical field of preparation of lithium hexafluorophosphate, the preparation method comprises the following steps: by taking anhydrous lithium fluoride as a lithium source in a closed reaction kettle, adding a carbonic ester and nitrile mixed organic solvent system, and adding ammonium pentafluorophosphate or an organic complex thereof as a phosphorus-containing precursor, in-situ generation and directional reaction of the fluorine-phosphorus-containing active substance are realized by controlling the slow release rate of the precursor. The solid weakly-alkaline fluorine trapping agent is arranged in the system and can dynamically adsorb or complex generated hydrofluoric acid and other fluorine-containing byproducts, so that fluorine dissipation is reduced. The reaction process is divided into three continuous windows of low-activity pre-reaction, directional main reaction and activity stabilization by regulating and controlling the reaction temperature, the stirring rate and the solvent polarity in stages, so that controllable reaction and uniform conversion of fluorine-containing phosphorus substances are ensured. And after the reaction is finished, gradually carrying out cooling crystallization, solid-liquid separation and drying to obtain a high-purity lithium hexafluorophosphate product. Therefore, generation and emission of hydrofluoric acid are remarkably reduced.

The application provides a purification method of lithium fluoride, high-purity lithium fluoride, lithium hexafluorophosphate, an electrolyte and a device, and the purification method of the lithium fluoride comprises the following steps: performing water washing treatment on the lithium fluoride to be purified at 0-50 DEG C to obtain a mixture containing a first solid-phase product; performing ultrasonic treatment on the mixture at 20-25 kHz to obtain a second solid-phase product through filtration; performing fluorination reaction on the second solid-phase product with electronic-grade anhydrous hydrofluoric acid to obtain a third liquid-phase product; performing ion exchange on the third liquid-phase product by using a chelating resin at 0-80 DEG C, and then performing cooling evaporation crystallization, and obtaining a fourth solid-phase product through filtration; and performing cleaning treatment on the fourth solid-phase product by using inert gas at 150-250 DEG C to obtain high-purity lithium fluoride. The high-purity lithium fluoride obtained by the purification method has low content of lithium carbonate and other impurities, and is beneficial to improving the performance and stability of subsequent products.

This invention belongs to the field of lithium-ion battery electrolyte material preparation technology, and provides a solid lithium hexafluorophosphate with low fine crystal content and its preparation method. The preparation method involves adding lithium fluoride to anhydrous hydrogen fluoride to form anhydrous hydrogen fluoride slurry. A portion of the anhydrous hydrogen fluoride slurry and phosphorus pentafluoride gas are fed into a primary continuous reaction crystallizer. The resulting slurry is subjected to low-temperature fractionation to form a first stream and a second stream. The second stream enters a secondary continuous growth crystallizer and continues to react with phosphorus pentafluoride gas, followed by solid-liquid separation to obtain a solid wet product and mother liquor. The first stream, another portion of the anhydrous hydrogen fluoride slurry, and a portion of the mother liquor enter a pre-conditioning section, and the resulting pre-conditioned stream is returned to the feed end of the primary continuous reaction crystallizer. The solid wet product is then subjected to low-temperature washing and programmed vacuum drying to obtain the final product. This method, through the combination of fractional reflux, mother liquor participation in pre-conditioning, and continuous growth processes, reduces fine crystal entrainment and improves particle size distribution stability.

The application belongs to the technical field of chemical materials, and specifically discloses a method for preparing lithium sulfide, which comprises the following steps: mixing and reacting lithium salt and ammonium sulfide to obtain lithium sulfide; wherein the lithium salt comprises at least one of lithium hexafluorophosphate, lithium difluorophosphate and lithium tetrafluoroborate. In the method for preparing lithium sulfide, the lithium salt and the ammonium sulfide can be fully reacted under mild conditions, the reaction time is short, the reaction yield is high, and the obtained lithium sulfide has high purity.

This invention relates to the field of lithium hexafluorophosphate (LiPF6) crystal production, and particularly to a LiPF6 crystal production apparatus, comprising a reaction chamber, a separator for solid-liquid separation of a LiPF6 solution, a crystallizer for condensing the LiPF6 solution connected to the lower side of the separator, and a dryer for heating and drying the crystals connected to the upper side of the separator. The invention involves preliminary filtration of the solution through a separation cylinder, followed by condensation processing in a feed pipe, where dissolved LiPF6 crystals are condensed and precipitated. The height difference between the falling solution and the feed tray causes the solution to splash onto the feed pipe wall, increasing the contact area between the solution and the pipe wall, thereby increasing the condensation efficiency and improving the production quality of LiPF6 crystals.

A kind of lithium battery electrolyte concentration and moisture fluorescent probe and fluorescent spectrum detection method, metal zirconium salt and organic ligand are dissolved in mixed solvent of organic solvent and water respectively, after heating and carrying out solvothermal reaction, cooling to room temperature, zirconium-based MOF is obtained by separation and purification.The zirconium-based metal organic framework material (MOF) with good specificity fluorescent recognition characteristic for lithium hexafluorophosphate is prepared in the application, which is used for fluorescent probe to detect the concentration and moisture content of lithium hexafluorophosphate in lithium ion battery electrolyte;The application significantly reduces the addition amount of detection agent in electrolyte, has obvious effect, low cost, and has no side effect on the electrochemical performance of electrolyte.

A lithium-ion battery and an electric device. The lithium-ion battery comprises a positive electrode sheet and an electrolyte. An active material in the positive electrode sheet comprises a lithium phosphate positive electrode material and lithium nickel cobalt manganese oxide. The electrolyte comprises a positive electrode film-forming agent, a negative electrode film-forming agent and a lithium salt, wherein the lithium salt includes lithium hexafluorophosphate and lithium bisfluorosulfonylimide. The lithium-ion battery satisfies the following equation: 0.1≤(I)≤0.59, where NL is the mass ratio of lithium nickel cobalt manganese oxide to the lithium phosphate positive electrode material, Salt is the numerical value of the sum of the molar concentrations of lithium hexafluorophosphate and lithium bisfluorosulfonylimide in the electrolyte with the unit being mol / L, and Add is the mass ratio of the positive electrode film-forming agent to the negative electrode film-forming agent.

A positive electrode material and a preparation method thereof, a positive electrode slurry, a positive electrode plate, a lithium ion battery and a preparation method thereof are provided. The battery comprises an electrolyte, the electrolyte comprises lithium hexafluorophosphate and an organic solvent, the positive electrode material comprises a positive electrode active substance and lithium carbonate, the lithium carbonate is coated on the surface of the positive electrode active substance, and a mass ratio of the positive electrode active substance to the lithium carbonate is 1:(0.001-0.03).