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A non-aqueous electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte

A lithium-ion battery, non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of high flash point, high oxidation decomposition voltage, poor solubility, etc., to improve oxidation voltage, enhance stability, and improve the ability to work stably Effect

Active Publication Date: 2019-01-04
산산어드밴스드머테리얼스(취저우)컴퍼니리미티드
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Fluorine has very strong electronegativity and weak polarity, and fluorinated solvent has advantages such as low melting point, high flash point and high oxidative decomposition voltage, and the inventor of the present invention has found that fluoroether solvent has overcome fluorinated solvent to lithium salt The disadvantage of poor solubility, the addition of fluoroether organic solvents can increase the overall oxidative decomposition voltage of the electrolyte, and the low melting point of fluoroether solvents can also improve the ability of the electrolyte to work at low temperatures

Method used

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  • A non-aqueous electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte
  • A non-aqueous electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte
  • A non-aqueous electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte

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Embodiment 1

[0028] Described nonaqueous electrolytic solution is prepared as follows: in glove box, ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and compound (1) are according to weight ratio 25:5: Mixed at a ratio of 50:20, and then added lithium hexafluorophosphate for dissolution to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1M. After that, 0.5% of vinylene carbonate, 1% of fluoroethylene carbonate (FEC), 1.5% of 1,3 propane sultone and 1% of lithium difluorophosphate ( LiPO 2 f 2 ).

[0029] Inject the prepared non-aqueous electrolyte for lithium-ion batteries into fully dried 4.35V NCM (nickel: cobalt: manganese = 5:2:3) / graphite soft-pack batteries, and put them on hold at 45°C, high-temperature fixture formation and After the secondary sealing and other procedures, the battery performance test was carried out to obtain the battery used in Example 1.

Embodiment 2

[0031]The positive electrode and negative electrode preparation method of embodiment 2 are the same as embodiment 1; The difference is that ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and compound (1) in embodiment 2 Configure according to the ratio of weight ratio 25:5:60:10.

Embodiment 3

[0033] The positive electrode and negative electrode preparation method of embodiment 3 are the same as embodiment 1; The difference is that ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and compound (2) in embodiment 3 Mix in a ratio of 25:5:50:20 by weight.

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Abstract

The invention discloses a non-aqueous electrolyte for lithium ion battery and a lithium ion battery using the electrolyte. A non-aqueous electrolyte for a lithium ion battery comprises a lithium salt,Organic solvents and additives, the lithium salt may be selected from the group consisting of LiPF 6, one or more of LiBF4, LiClO4 and the like, wherein the organic solvent is selected from the groupconsisting of chain carbonate, cyclic carbonate, carboxylic ester and a mixed organic solvent of a fluorinated ether compound represented by the general formula (I), and may further comprise a commonly used additive of a high voltage type. The non-aqueous electrolyte for lithium ion battery is added with fluorinated ether solvent, and the addition of fluorinated ether improves the oxidation decomposition voltage of the organic solvent and improves the working performance of the electrolyte under the condition of high voltage.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a nonaqueous electrolytic solution for a lithium ion battery and a lithium ion battery using the electrolytic solution. Background technique [0002] In recent years, the development of lithium-ion batteries has received widespread attention, and it has developed rapidly in the field of mobile phone digital, electric vehicles, electric bicycles, electric tools, and energy storage. Due to the improvement of people's requirements for battery life, batteries with high energy density have become a research hotspot. On the one hand, electrode materials with high energy density, such as high-nickel materials, lithium-rich manganese bases, and silicon-carbon anodes, have attracted much attention; on the other hand, high-voltage lithium-ion batteries are the main trend of current research. Materials present new challenges. [0003] In order to realize the high energy of lithium-ion secondary b...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0025Y02E60/10
Inventor 杨冰杜建委朱学全曹青青周彤
Owner 산산어드밴스드머테리얼스(취저우)컴퍼니리미티드
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