Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same

A technology of lithium ion battery and non-aqueous electrolyte, which is applied in the field of lithium ion battery, can solve the problems that nitrile additives can not improve the high temperature performance of the battery, reduce the low temperature discharge performance of the battery, and increase the impedance of the lithium cobalt oxide battery. Achieve the effect of ensuring room temperature and high temperature performance, low impedance, and reducing restrictions

Inactive Publication Date: 2021-03-12
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although nitrile additives can significantly improve the high-temperature storage and high-temperature cycle performance of 4.35V high-voltage batteries, when the charging voltage of lithium cobaltate lithium-ion batteries is further increased, the effect of nitrile additives on improving the high-temperature performance of batteries is not obvious
In addition, nitrile additives increase the impedance of lithium cobalt oxide batteries and reduce the low-temperature discharge performance of batteries

Method used

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  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The non-aqueous electrolyte is prepared as follows: in the glove box, ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) are carried out according to the ratio of 1:1:1 by weight Mix and then add lithium hexafluorophosphate for dissolution to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1.1M. After that, add 0.5% vinylene carbonate (VC), 5% fluoroethylene carbonate (FEC) and 4% 1,3-propane to the electrolyte. sultone (PS), compound (a) accounting for 0.5% of the mass of the electrolyte and compound (4) accounting for 1% of the mass of the electrolyte.

[0030] Inject the prepared non-aqueous electrolyte solution for lithium-ion batteries into fully dried, 4.4V lithium cobalt oxide (LiCoO 2 ) / graphite soft pack battery, after shelving at 45°C, high-temperature fixture formation and secondary sealing process, the battery performance test was carried out to obtain the battery of Example 1.

Embodiment 2

[0032] The preparation method of the positive electrode and the negative electrode in Example 2 is the same as in Example 1; the difference is that 0.5% of the compound (b) is added to the electrolyte solution in Example 2.

Embodiment 3

[0034] 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 the compound (c) accounting for 0.5% of the mass of the electrolyte is added to the electrolyte of Example 3.

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Abstract

The invention belongs to the field of batteries, and discloses a non-aqueous electrolyte for a lithium ion battery and the lithium ion battery using the electrolyte. The non-aqueous electrolyte for the lithium ion battery comprises a lithium salt, an organic solvent and an additive, the additive comprises a conventional additive, a lithium sulfonate salt compound and a nitrile compound, and the conventional additive is selected from one or more of the group of fluoroethylene carbonate (FEC), 1, 3-propanesultone (PS), vinylene carbonate (VEC), vinylene carbonate (VC), propylene carbonate (PC) and lithium difluorophosphate (LiPO2F2). The sulfur-containing lithium salt additive and the nitrile additive in the electrolyte are matched for use, so that the normal-temperature and high-temperatureperformances of the lithium cobalt oxide battery can be guaranteed, the low-temperature performance of the lithium cobalt oxide battery can be improved, and the limitation of a working environment onthe performance of the battery is reduced.

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, lithium-ion batteries have received widespread attention, and have developed rapidly in the field of mobile phone digital, electric vehicles, electric bicycles, electric tools, and energy storage. Compared with other batteries, lithium-ion batteries have the advantages of light weight, small size, high energy density, and long cycle life. At present, digital products such as smartphones and tablet computers have higher and higher requirements for energy density, making it difficult for commercial lithium-ion batteries to meet the requirements. Using high-energy-density materials as the positive electrode of the battery is the most effective way to increase the energy density of lithium-ion batteries. way. [0003] Among t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0563H01M10/0567H01M10/0525
CPCH01M10/0563H01M10/0567H01M10/0525H01M2300/0091H01M2300/0017Y02E60/10
Inventor 杨冰杜建委吴杰曹青青
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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