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A kind of non-aqueous electrolytic solution for lithium ion battery and lithium ion battery using the electrolytic solution

A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as high flash point, poor solubility, high oxidation decomposition voltage, etc., and achieve the effect of increasing oxidation voltage, enhancing stability, and improving work ability

Active Publication Date: 2020-10-02
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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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 kind of non-aqueous electrolytic solution for lithium ion battery and lithium ion battery using the electrolytic solution
  • A kind of non-aqueous electrolytic solution for lithium ion battery and lithium ion battery using the electrolytic solution
  • A kind of non-aqueous electrolytic solution for lithium ion battery and lithium ion battery using the electrolytic solution

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The non-aqueous electrolyte is prepared as follows: In a glove box, ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and compound (1) are prepared in a weight ratio of 25:5: Mix at a ratio of 50:20, and then add lithium hexafluorophosphate for dissolution to prepare an electrolyte 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 were added to the electrolyte. LiPO 2 F 2 ).

[0029] Inject the prepared lithium-ion battery with non-aqueous electrolyte into the fully dried 4.35V NCM (nickel: cobalt: manganese = 5:2:3) / graphite soft pack battery, and then put it aside at 45°C and form a high-temperature fixture. After the secondary sealing and other procedures, the battery performance test was performed to obtain the battery used in Example 1.

Embodiment 2

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

Embodiment 3

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

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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 non-aqueous electrolyte for lithium ion batteries and a lithium ion battery using the electrolyte. 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, power tools, and energy storage. Due to the increasing requirements for endurance, batteries with high energy density have become a research focus. On the one hand, electrode materials with high energy density, such as high nickel materials, lithium-rich manganese-based, silicon-carbon anode and other electrode materials have attracted much attention; on the other hand, high-voltage lithium-ion batteries are the main trend in current research. The materials present new challenges. [0003] In order to realize the high energy of the lithium ion secondary battery, it is g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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