3395 results about "Aqueous electrolyte" patented technology

In order to solve the problem that an existing high-voltage lithium ion battery is insufficient in high-temperature performance and safety performance, the invention provides a cyclic carbonate-sulfate compound and application thereof, a non-aqueous electrolyte and a secondary battery, and the cyclic carbonate-sulfate compound comprises a compound as shown in a chemical formula 1, the specific rotation [alpha] of the cyclic carbonate-sulfate compound ranges from-7.982 degrees mL / (dmg) to + 7.982 degrees mL / (dmg), and the specific rotation [alpha] of the cyclic carbonate-sulfate compound ranges from-7.982 degrees mL / (dmg) to + 7.982 degrees mL / (dmg); the chemical formula 1 of the # imgabs0 # is shown in the specification. When the cyclic carbonate-sulfate compound provided by the invention is used as an electrolyte additive, a formed solid electrolyte membrane is smoother and more ordered, so that the cyclic carbonate-sulfate compound has higher high-temperature stability, especially membrane layer stability under a thermal shock condition.

The invention provides a sodium ion battery electrolyte additive and a composition thereof, an electrolyte and a sodium ion battery containing the electrolyte. The additive is a fluorine-containing cyclic sulfate compound, the composition comprises fluorine-containing cyclic sulfate and other additives, and the fluorine-containing cyclic sulfate has a structure as shown in a formula (I): # imgabs0 # formula (I); the sodium-ion battery electrolyte comprises an organic solvent, a sodium salt electrolyte, the additive and any one composition of the additive, the sodium-ion battery comprises a positive electrode material, a negative electrode material and any one of the combined electrolyte. As the fluorine-containing additive has a relatively low HOMO energy level, the oxidation resistance of the non-aqueous electrolyte can be improved, and the electrochemical window of the non-aqueous electrolyte is widened; meanwhile, the cyclic sulfate participates in the formation of a negative electrode SEI film, so that the electrode interface is stabilized, and the impedance of the negative electrode surface can be remarkably reduced, thereby reducing the overall impedance of the battery, improving the rate capability and high-temperature performance of the battery, and prolonging the cycle life of the battery.

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, wherein the electrode assembly comprises a positive plate, a negative plate and a non-aqueous electrolyte; the positive plate comprises a positive current collector and a positive film layer, and the negative plate comprises a negative current collector and a negative film layer; the positive electrode film layer comprises a positive electrode active material, and the positive electrode active material comprises a lithium manganese iron phosphate material and a nickel cobalt lithium manganate material; in the nickel cobalt lithium manganate material, the molar ratio of Ni in the sum of the three elements of Ni, Co and Mn is 0.5-0.95; the non-aqueous electrolyte comprises vinylene carbonate, and the mass content of the vinylene carbonate in the non-aqueous electrolyte is 0.5%-2%; the non-aqueous electrolyte comprises at least one of linear carbonic ester and linear carboxylic ester, and the conductivity of the non-aqueous electrolyte is 9-14 mS / cm. The energy density, the cycle performance and the power performance of the battery monomer are improved at the same time.

The invention provides a lithium manganese iron phosphate battery. The battery comprises a positive pole piece, a negative pole piece and a non-aqueous electrolyte, the positive pole piece comprises a positive active material and a positive active coating arranged on at least one surface of the positive active material; the positive electrode active material comprises lithium manganese iron phosphate LiMnxFe1-xPO4 coated with a carbon coating layer, and x is more than or equal to 0.5 and less than or equal to 0.8; the negative pole piece comprises a negative active material and a negative active coating arranged on at least one surface of the negative active material; the battery satisfies the following relational expressions: 4.5 < = (a / 20 + d) / (b + c) < = 12.8; a is a coated diaphragm resistor of the positive pole piece; b is the compaction density of the positive pole piece; c is the mass percentage content of vinylene carbonate in the positive electrode slurry; and d is the mass percentage content of the lithium bis (fluorosulfonyl) imide in the non-aqueous electrolyte. By optimizing the composition of the lithium ion battery, the low-temperature discharge performance of the battery is improved, and meanwhile, the high-temperature cycle performance is considered.

A lithium-ion battery having excellent high-temperature storage and high-temperature cycling performance. The lithium-ion battery comprises a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode comprises a negative electrode material layer containing a silicon-based material. The non-aqueous electrolyte solution comprises a lithium salt, an organic solvent, and an additive, the organic solvent comprising fluoroethylene carbonate, and the additive comprising a silane compound containing at least one carbon-carbon double bond. The lithium-ion battery satisfies the following conditions: 5≤(S*R) / (F*T)≤35, 5≤f≤15, 1.4≤R≤1.68, 9≤S≤18, and 0.01≤T≤0.5. According to the lithium-ion battery, the mass percentage content of the organic solvent and the additive in the non-aqueous electrolyte solution are controlled, and the mass percentage content of elemental silicon in the negative electrode material layer is controlled and the compaction density of the negative electrode material layer is controlled to be within a certain range, such that the lithium-ion battery has excellent high-temperature storage performance and an excellent high-temperature cycle life, while also taking into account high energy density.

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 is applied to the technical field of lithium ion batteries, and discloses a non-aqueous electrolyte for a lithium ion battery, which comprises the following substances in percentage by weight: 1-20% of electrolyte lithium salt, 70-90% of organic solvent and 0.1-10% of functional additive, the electrolyte lithium salt is composed of a lithium salt A and a lithium salt B, and the weight fraction of the lithium salt A is greater than that of the lithium salt B; the organic solvent is composed of a solvent C and a solvent D, the weight fraction of the solvent C is 3%-20%, and the weight fraction of the solvent D is 50%-88%. According to the non-aqueous electrolyte for the lithium ion battery, the lithium fluorosulfonyl difluoroacetate is adopted as the main lithium salt to prepare the non-aqueous electrolyte, so that the electrolyte has the advantages of high ionic conductivity, stability in air and good thermal stability, and the performance of the lithium battery is more excellent.

This application provides a secondary battery, a battery module, a battery pack, and an electric apparatus. The secondary battery includes a positive electrode plate and a non-aqueous electrolyte, where a positive electrode active material includes a core and a shell enveloping the core, the core including Li1+xMn1-yAyP1-zRzO4 and the shell including a first coating layer enveloping the core and a second coating layer enveloping the first coating layer, where the first coating layer includes a pyrophosphate MP2O7 and a phosphate XPO4, and the second coating layer includes carbon; and the non-aqueous electrolyte includes a first additive, the first additive including one or more from a group consisting of compounds shown in formula 1 and compounds shown in formula 2. Use of the positive electrode active material or the combination of the positive electrode active material and the non-aqueous electrolyte improves the rate performance, cycling performance, and high-temperature stability of lithium manganese phosphate secondary batteries.

A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte solution includes a lithium salt, an organic solvent, and a compound represented by Formula 1 as an additive. A lithium secondary battery including the non-aqueous electrolyte solution has improved high-rate charge and discharge characteristics at high temperature.

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 belongs to the technical field of sodium ion batteries, and discloses a sodium ion battery non-aqueous electrolyte and a sodium ion battery. The non-aqueous electrolyte of the sodium-ion battery comprises a non-aqueous organic solvent, electrolyte sodium salt and an additive, wherein the additive comprises a conventional additive and an acid anhydride substance with a structure as shown in a formula (I) and / or a formula (II). The acid anhydride additives with the structures shown in the formula (I) and the formula (II) in the electrolyte can form passive films on a positive-negative electrode interface, metal ion dissolution is inhibited, negative electrode active sites are covered, structural collapse caused by dissolution of metal ions in a positive electrode material is effectively avoided, catalytic reduction reaction of a solvent on the negative electrode interface is avoided, and the service life of the electrolyte is prolonged. Therefore, the dynamic performance and thermodynamic performance of the sodium-ion battery are improved, and the cycle performance, high-temperature performance and calendar life of the sodium-ion battery are improved.

The invention relates to the technical field of lithium ion batteries, in particular to a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises an organic solvent, a lithium salt, difluorophosphate ions, tris (trimethylsilyl) phosphate and a first additive; the lithium salt comprises lithium hexafluorophosphate; the non-aqueous electrolyte satisfies the following conditions: 0.05 < = a / b < = 20, 0.03 < = a / c < = 15, 0.05 < = c * d / b < = 20, 0.01 < = a < = 1, 0.01 < = b < = 1.2, 0.01 < = c < = 0.8, and 1.1 < = d < = 1.3. According to the non-aqueous electrolyte disclosed by the invention, the advantages of tris (trimethylsilyl) phosphate that the impedance of a battery is reduced and a high-stability LiF-rich interfacial film is formed can be fully exerted, meanwhile, the defect that tris (trimethylsilyl) phosphate catalyzes decomposition of lithium salt to generate unfavorable byproducts is greatly inhibited, and relatively low initial impedance and excellent high-temperature quick-charge cycle performance can be considered on the battery level; and the problem of rapid increase of impedance under high-temperature rapid charging circulation is inhibited.

A lithium secondary battery according to the embodiments of the present disclosure comprises: a positive electrode comprising positive active material containing lithium metal oxide particles; a negative electrode facing the positive electrode; and a non-aqueous electrolyte solution comprising a non-aqueous organic solvent, lithium salt, and an additive containing a difluorophosphite-based compound, the molar ratio of lithium in the lithium metal oxide particles to the overall metal excluding the lithium in the lithium metal oxide particles is 1.05 or greater.

In order to solve the problem that an existing lithium ion battery is insufficient in rate performance, high-temperature performance and low-temperature performance, the invention provides a lithium ion battery which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the negative electrode comprises a negative electrode material layer containing a negative electrode active material and a negative electrode interface film formed on the surface of the negative electrode material layer, and the non-aqueous electrolyte is formed on the surface of the negative electrode material layer. The specific surface area of the negative electrode material layer is 0.5-5 m < 2 > / g, the median particle size of the negative electrode material layer is 8-17 [mu] m, the non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, the additive comprises a lithium salt type additive and a compound represented by a structural formula 1: # imgabs0, and the lithium ion battery satisfies the following condition: 0.5 < = Wa / Wb < = 10. According to the lithium ion battery provided by the invention, the proportion of the organic matter component and the inorganic matter component in the negative electrode interface film is mutually coordinated, so that a lithium ion interface transmission channel can be optimized, and the high-temperature storage performance is optimal while the low-temperature performance and the rate capability are improved.

The present invention provides a non-aqueous electrolyte characterized by comprising: a lithium salt; an organic solvent; and an additive, wherein the additive includes a compound represented by a specific chemical formula. The non-aqueous electrolyte according to the present invention can suppress the deterioration of a positive electrode, reduce side reactions between the positive electrode and the electrolyte, and form a stable SEI film on a negative electrode, and thus can improve the high-temperature cycle characteristics and high-temperature storage characteristics of a lithium secondary battery comprising the non-aqueous electrolyte.

The present application relates to the technical field of batteries, and relates to a secondary battery and an electric device. The secondary battery comprises a non-aqueous electrolyte containing a cyclic sulfate compound. The present application further relates to an electric device comprising the secondary battery.

To provide solid electrolyte materials which are stable when in contact with aqueous electrolytes but retain conductivity and flexibility.SOLUTION: A solid electrolyte comprises a first polymer which is a polyvinyl acetal or polyvinyl acetate, and / or a copolymer having vinyl acetal and / or vinyl acetate units, doped with a sodium or lithium salt.SELECTED DRAWING: None

The invention provides a preparation method and application of an aqueous composite electrolyte. The preparation method comprises the following steps: uniformly mixing aqueous zinc salt and a water-soluble heterocyclic amine organic additive; and adding deionized water, continuously stirring until the solution is dissolved, and standing until the pH value is stable to obtain the aqueous composite electrolyte. The additive can improve the stability of the aqueous electrolyte, and zinc-philic groups in molecules of the organic additive can form coordinate bonds with zinc ions, so that the molecules of the additive can be adsorbed on the surface of a zinc electrode, electric field distribution on the surface of the electrode is balanced, non-uniform deposition of the zinc ions on the surface of the electrode is prevented, and the stability of the aqueous electrolyte is improved. Dendritic crystal growth caused by too strong local electric field is reduced, meanwhile, the utilization rate of zinc is increased, and the performance of the battery is effectively improved; after the additive molecules are adsorbed on the surface of the zinc electrode, a part of active sites for analyzing hydrogen reaction on the surface of the electrode can be covered, the hydrogen evolution reaction is inhibited, the generation of byproducts is reduced, the coulombic efficiency is improved, and the corrosion resistance and the cycling stability of the zinc negative electrode are effectively improved.

A nonaqueous electrolyte secondary battery according to an aspect of the present disclosure includes: an electrode body in which a positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween; and an exterior package which receives the electrode body, the negative electrode plate includes a negative electrode collector, a first negative electrode mixture layer formed on a winding inside first surface of the negative electrode collector, and a second negative electrode mixture layer formed on a winding outside second surface of the negative electrode collector, the first negative electrode mixture layer contains first graphite particles as a primary component, the second negative electrode mixture layer contains second graphite particles as a primary component, and the first graphite particles has an internal void rate lower than an internal void rate of the second graphite particles.

The invention discloses a two-phase electrolyte, a preparation method thereof and a liquid energy storage battery system, and belongs to the technical field of electrochemical energy storage. According to the invention, a liquid-liquid double-phase electrolyte is composed of a water-phase electrolyte and an organic-phase electrolyte, wherein the organic-phase electrolyte contains a coupling system of 1-(methyl-decyl)-3-methylimidazolium bromide, tris (methyl-decyl) methyl ammonium bromide and (10-octadecyl) alkyl trimethyl ammonium bromide in a molar ratio of (5-7): (2-4): 1. During charging, positive electrode bromide ions are subjected to an oxidation reaction to generate a bromine simple substance, and meanwhile, the bromine simple substance and a coupling system of the quaternary ammonium bromide compound and the bromine complexing agent provided by the invention form a stable polybromine complex product, so that the polybromine complex product is prevented from being migrated into a water-phase electrolyte, and the purpose of improving the stability of the water-phase electrolyte in the absence of a diaphragm is achieved. The self-discharge reaction of bromine is significantly inhibited at a high temperature exceeding the boiling point temperature of bromine, the coulombic efficiency and energy efficiency of the liquid energy storage battery are improved, the system cost is reduced, and the long-term cycle stability of the liquid energy storage battery is improved.

The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a low-temperature aqueous electrolyte for anchoring I < + > ions based on a double-coordination structure and a low-temperature four-electron aqueous zinc-iodine battery. The low-temperature aqueous electrolyte is a mixed solution of a zinc salt, an electrolyte additive and water, and the low-temperature aqueous electrolyte comprises 2-5 mol / L of the zinc salt and 0.3-0.6 mol / L of the electrolyte additive; the zinc salt is zinc perchlorate or zinc tetrafluoroborate. The low-temperature four-electron aqueous zinc-iodine battery comprises the low-temperature aqueous electrolyte. Compared with the prior art, the invention at least has the following beneficial effects: (1) the corrosion risk caused by chloride ion concentration is reduced; (2) efficient four-electron iodine positive electrode reaction is realized; and (3) obtaining the low-temperature four-electron aqueous zinc-iodine battery.

Disclosed is an additive for a non-aqueous electrolyte solution, which contains a cyclic sulfone compound represented by formula (1). X1 represents a sulfonyl group or a carbonyl group, and Z represents a monovalent group represented by formula (21), (22), (23) or (24). # imgabs0 #

The invention relates to a non-aqueous electrolyte and a lithium secondary battery. In order to solve the problems of poor cycle performance, high impedance and serious gas production of a lithium secondary battery, the invention provides a non-aqueous electrolyte, the non-aqueous electrolyte comprises an organic solvent, a lithium salt and additives, the additives comprise a first additive, a second additive and a third additive, the first additive is selected from one or more of compounds shown in a formula I, and the third additive is selected from one or more of compounds shown in a formula II; the formula I is # imgabs0; the second additive is selected from a compound shown in a formula II and / or a formula III; the formula II is # imgabs 1 #, the formula III is # imgabs 2 #, and the third additive is selected from one or more of double-bond-containing cyclic carbonate, halogen-containing cyclic carbonate, sulfonate, sulfate, sulfite, anhydride, a benzene compound, a fluorobenzene compound, a nitrile compound, phosphate, phosphite, a boron compound, an amine compound, a silicon-containing compound and a heterocyclic compound. Through the synergistic effect of the three additives, the cycle performance of the battery is improved, the impedance of the battery is reduced, and the gas production of the battery is reduced.

The invention discloses a non-aqueous electrolyte and a lithium ion battery containing the non-aqueous electrolyte. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a benzenesulfonyl fluoride compound as shown in a structural formula I and a carbonate bisulfate compound as shown in a structural formula II. According to the non-aqueous electrolyte disclosed by the invention, the benzenesulfonyl fluoride compound and the polyol carbonate bisulfate compound are used as additives, and the benzenesulfonyl fluoride compound and the polyol carbonate bisulfate compound are matched for use, so that the ion transmission rate can be increased, the high-temperature cycle performance of the lithium ion battery is improved, the internal resistance is reduced, and the high-temperature storage performance of the lithium ion battery is improved. # imgabs0 #

The present invention discloses a non-aqueous electrolyte for a secondary battery and a secondary battery thereof, the electrolyte comprises an electrolyte salt, a non-aqueous solvent and an additive, the additive at least comprises: a nitrogen-containing heterocyclic compound as a first additive, a film-forming additive with a film-forming potential of less than 1.5 V (vs. Li + / Li) as a second additive, the specific structure of the additive is shown in the specification. The nitrogen-containing heterocyclic compound and the film-forming additive with the film-forming potential lower than 1.5 V (vs.Li < + > / Li) are combined for use, and the nitrogen-containing heterocyclic compound and the film-forming additive are regulated in a specific content ratio range to fully generate a synergistic effect, so that water catching and acid inhibition can be effectively realized, decomposition and gas production can be effectively inhibited at high temperature and high voltage, the stability of the electrolyte is greatly improved, and the service life of the electrolyte is prolonged. And an SEI film with excellent ion transmission capability and structure / thermal stability can be formed on the surface of the electrode, so that the first efficiency of the battery is effectively improved, and the low-temperature performance and the cycle performance of the battery are further improved.

A lithium secondary battery including a positive electrode, a negative electrode having a negative electrode current collector that faces the positive electrode, and a non-aqueous electrolyte, wherein lithium metal deposits on the negative electrode during charge, and the lithium metal dissolves from the negative electrode into the non-aqueous electrolyte during discharge. The non-aqueous electrolyte includes an organic compound having a redox potential of 0 V or more and 4 V or less vs Li / Li+.

The invention relates to a non-aqueous electrolyte composition having a solvent system which comprises a first component which comprises a first organo carbonate-based solvent and a second organo carbonate-based solvent; and a second component which comprises one or more performance additives that includes tris(trimethylsilyl) borate (TMSB). Devices, methods and uses including electrolytes compositions are also disclosed.

The invention provides a non-aqueous electrolyte and a lithium ion battery thereof. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a compound A as shown in a formula I and a compound B as shown in a formula II. Wherein R1, R2, R3 and R4 are respectively and independently selected from hydrogen, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C2-C12 alkenyl and substituted or unsubstituted C2-C12 alkynyl, n is a natural number from 1 to 5, and M is alkali metal. The non-aqueous electrolyte provided by the invention contains two additives, namely the compound A and the compound B, and through the synergistic effect of the two additives, the increase of high-temperature storage internal resistance can be reduced, and the high-temperature storage performance of the lithium ion battery can be improved. # imgabs0 #

The invention belongs to the technical field of thermoelectricity, and relates to a preparation method and application of a quasi-solid thermoelectric material capable of realizing humidity stability by means of phase separation regulation, the preparation method comprises the following steps: dissolving a negatively charged hydrophilic monomer, an electrically neutral monomer, a cross-linking agent and a photoinitiator in a solvent to obtain a precursor solution, and carrying out an ultraviolet polymerization reaction to form polyelectrolyte gel; mixing the eutectic solvent with an electrolyte aqueous solution containing redox ion pairs and lithium chloride to obtain a quaternary electrolyte system; and immersing the gel into a quaternary electrolyte system, and fully replacing the internal solution through a diffusion effect to obtain the quasi-solid thermoelectric material with stable humidity. The thermoelectric material has the advantages of excellent Seebeck coefficient, good stability, high mechanical strength, large power density and the like, can supply power to wearable electronic products in an actual humidity fluctuation environment, breaks through the main bottleneck of actual application of quasi-solid ionic thermoelectric materials based on ionized water gel, and is wide in application prospect.

The invention provides a non-aqueous electrolyte, a lithium ion battery, a battery module, a battery pack and an electric device. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and a functional additive, and the functional additive comprises a bis-sulfinyl ester structure as shown in a formula I in the specification. When the non-aqueous electrolyte is used in the lithium ion battery, the wettability of the electrolyte can be effectively enhanced, the ionic conductivity of the electrolyte is improved, the low-temperature discharge capacity of the electrolyte is improved, and the stability of the electrolyte under high-temperature and high-voltage conditions is improved; and thus, the discharge capability and the service life of the lithium ion battery in high-temperature storage and high-temperature circulation are improved.