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Non-aqueous electrolyte suitable for 20-60 DEG C and lithium ion battery based on the non-aqueous electrolyte

A non-aqueous electrolyte and electrolyte technology, used in secondary batteries, circuits, electrical components, etc., can solve the problems of low temperature performance of batteries, increase in battery impedance, low boiling point, etc. The effect of suppressing DCR growth

Pending Publication Date: 2021-04-16
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the low-temperature performance of the battery, carboxylic acid esters with low melting points such as ethyl acetate and ethyl propionate are generally selected as the main solvent of the electrolyte, but these solvents have relatively low boiling points, which are not good for the high-temperature performance of the battery.
In order to improve high-temperature performance, additives such as vinylene carbonate and ethylene carbonate are generally used, but this type of additive will cause a large impedance of the battery, especially at low temperatures, the impedance of the battery will increase significantly, resulting in poor low-temperature performance of the battery. decline

Method used

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  • Non-aqueous electrolyte suitable for 20-60 DEG C and lithium ion battery based on the non-aqueous electrolyte
  • Non-aqueous electrolyte suitable for 20-60 DEG C and lithium ion battery based on the non-aqueous electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]A nonaqueous electrolyte, with a weight meter, including the following components:

[0044]LIPF612.3 copies, LIBF40.2 copies, Liclo41 part, 1.5 parts of sulfate, 1.3 parts of tetravinyl silane, 1.5 parts of 2-propynyl carbonate, 5.5 parts of fluoro carbonate, 20 parts of gamma-butyl carbonate, carbonated 20 parts of dimethyl, 20 diets of carbonate;

[0045]Non-hydroelectric solutions LICO3The concentration is 80 ppm; LIO2The concentration is 100 ppm; Li2O2The concentration is 100 ppm.

[0046]Soft-packing lithium ion secondary batteries are filled with the above electrolyte group.

Embodiment 2

[0048]A nonaqueous electrolyte, with a weight meter, including the following components:

[0049]LIPF614 copies, LIBF40.4 copies, Liclo41.2 parts, 6 parts of dimethyl sulphate, 3 parts of tetravinylsilane, 2.8 parts of 2-propynyl carbonate, 7.5 parts of fluorocarbonate, 25 parts of propylene carbonate, and bicarbonate 25 parts of esters, 20 diets of carbonate;

[0050]Non-hydroelectric solutions LICO3The concentration is 100 ppm; LIO2The concentration is 100 ppm; Li2O2The concentration is 100 ppm; CO2The content is 150 ppm.

[0051]Soft-packing lithium ion secondary batteries are filled with the above electrolyte group.

Embodiment 3

[0053]A nonaqueous electrolyte, with a weight meter, including the following components:

[0054]LIPF617 copies, LIBF40.4 copies, Liclo41.5 parts, 8 parts of dimethyl sulphate, 5 parts of tetravinylsilane, 4.8 parts of 2-propynyl carbonate, 10 parts of fluorocarbonate, 30 carbonate, and methyl carbonate 25 parts of ester, 30 of diethyl carbonate;

[0055]Non-hydroelectric solutions LICO3The concentration is 80 ppm; LIO2The concentration is 80 ppm; Li2O2The concentration is 100 ppm; CO2The content is 100 ppm.

[0056]Soft-packing lithium ion secondary batteries are filled with the above electrolyte group.

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Abstract

The invention relates to a non-aqueous electrolyte suitable for 20-60 DEG C and a lithium ion battery based on the non-aqueous electrolyte. The non-aqueous electrolyte comprises the following components: electrolyte lithium salt, dimethyl sulfate lithium trifluoroborate, tetravinyl silane (TVS), 2-propynyl methyl carbonate, fluoroethylene carbonate and a solvent, wherein the concentration of LiCO3 in the non-aqueous electrolyte is 100 ppm or less, the concentration of LiO2 is 100 ppm or less, and the concentration of Li2O2 is 100 ppm or less. The non-aqueous electrolyte disclosed by the invention has both high-temperature and low-temperature (-20 DEG C to 60 DEG C) storage stability, and the prepared lithium ion battery has good cyclicity at -20 DEG C to 60 DEG C.

Description

Technical field[0001]The present invention relates to the field of battery technology, and more particularly to a nonaqueous electrolyte suitable for use in -20 ° C to 60 ° C and a lithium ion battery based on its.Background technique[0002]The lithium ion battery using nonaqueous electrolyte changes in battery characteristics with the composition of the nonaqueous electrolyte, the decomposition and side reactivity of the electrolyte will mainly affect the cycle characteristics and storage characteristics of the lithium ion battery. At present, it has tried to alleviate these problems by adding various additives to the electrolyte.[0003]In order to improve the low temperature performance of the battery, a carboxylate having a lower melting point of ethyl acetate, ethyl propionate is generally selected as the main solvent of the electrolyte, but the boiling point of these solvents is relatively low, and the high temperature performance of the battery is unfavorable. In order to improv...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 李轶余乐王仁和
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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