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A kind of electrolyte for high temperature lithium battery

A high-temperature lithium battery and electrolyte technology, applied in the direction of electrolyte, secondary battery, secondary battery repair/maintenance, etc., can solve the problems of decreased stability, poor battery cycle performance, etc., to offset volume expansion, good thermal contraction and cooling Expansion ability, increase the effect of transmission channel

Active Publication Date: 2022-07-15
安徽天时新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, provide an electrolyte solution for high-temperature lithium batteries, and overcome the defects of poor cycle performance of the battery caused by the decrease in stability of the electrolyte under high temperature conditions

Method used

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  • A kind of electrolyte for high temperature lithium battery

Examples

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preparation example Construction

[0029] The method for preparing the positive electrode is as follows: coating a current collector with a slurry containing a positive electrode active material, a binder and a conductive agent, drying, rolling and slicing to obtain a positive electrode.

[0030] In the present invention, the composition of the negative electrode can also be known to those skilled in the art. Generally, the negative electrode includes a current collector and a negative electrode material coated on the current collector, and the current collector can be used in the art Well-known to the skilled person, such as one of aluminum foil, copper foil, nickel-plated steel strip, punched steel strip. Described negative electrode material is known to those skilled in the art, including negative electrode active material and binder, described negative electrode active material can be selected from those commonly used by those skilled in the art, specifically as natural graphite, artificial graphite, petrole...

Embodiment 1

[0036] An electrolyte for high temperature lithium battery, the electrolyte contains lithium salt, organic solvent, silane compound and functional additives;

[0037] The functional additive is a lithium-doped zirconium vanadate material, and the preparation method includes dispersing 30 parts by weight of zirconium oxychloride octahydrate into water, adding ammonia water (1M) to adjust the pH to 10.5, and then adding 45 parts by weight of ammonium metavanadate and 3 parts by weight of lithium salt LiPF 6 , after mixing evenly, heating in a water bath, refluxing for 6 hours, heating and concentrating the solution, cooling and crystallization; then placing the obtained crystal in a tubular resistance furnace and heating to 1280 ° C for calcination for 4 hours, and immersing the calcined product in distilled water while hot , stirring, and then centrifuging to remove water, and fully drying the solid product to obtain a lithium-doped zirconium vanadate material;

[0038] The pr...

Embodiment 2

[0047] The composition of the electrolyte in this example is basically the same as that in Example 1, the difference is that,

[0048] Based on the total weight of the electrolyte, the lithium salt is LiPF 6 , its content is 3% by weight, the organic solvent is dimethyl carbonate, its content is 82% by weight, and the silane compound is (CH 3 ) 3 SiO(CH 2 CH 2 O) 3 CH 3 , its content is 12% by weight, and the content of the lithium-doped zirconium vanadate material is 3% by weight;

[0049] The rest remained unchanged, and the lithium ion battery A2 was obtained according to the preparation method of the positive electrode, the negative electrode and the battery in Example 1.

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to an electrolyte for high-temperature lithium batteries. The electrolyte contains lithium salts, organic solvents, silane compounds and functional additives; and, based on the total weight of the electrolyte, The content of the lithium salt is 1-25% by weight, the content of the organic solvent is 10-82% by weight, the content of the silane compound is 12-20% by weight, and the content of the functional additive is 0.5-5% by weight. %; The present invention adds lithium-doped zirconium vanadate material. The zirconium vanadate material has good thermal contraction and cold expansion capabilities, which can offset the volume expansion of lithium batteries at high temperatures; and, due to lithium doping into vanadate Among the defects of zirconium, it forms a stable regular octahedral bipyramidal crystal structure, which improves the structural stability; more importantly, due to the incorporation of lithium, the transmission channel of lithium ions in the electrolyte is increased, indirectly improving the Improves the ionic conductivity of the electrolyte and improves the performance of lithium batteries.

Description

Technical field [0001] The invention belongs to the technical field of lithium batteries, and particularly relates to an electrolyte for high-temperature lithium batteries. Background technique [0002] As a new type of chemical energy, lithium batteries have been widely used in people's production and life, such as mobile phones and notebooks, because of their high energy density, high working voltage, long cycle life, and environmental friendliness. Among portable electronic devices such as computers and cameras, it is also the preferred power source for future electric vehicles and hybrid vehicles, with broad application prospects and huge economic benefits. [0003] Lithium battery electrolyte is the carrier for ion transport in the battery. Generally composed of lithium salts and organic solvents, the electrolyte plays a role in conducting ions between the positive and negative electrodes of lithium batteries, ensuring that lithium-ion batteries obtain the advantages o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0563H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0563H01M10/4235H01M2300/002Y02E60/10
Inventor 冯联友王兴赵俊伟吴伟杰
Owner 安徽天时新能源科技有限公司