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Electrolyte containing novel additive for lithium ion battery and lithium ion battery

A lithium-ion battery and additive technology, applied in the field of lithium-ion batteries, can solve problems such as poor high-temperature cycle performance, achieve the effects of improving high-voltage resistance, improving cycle performance, and reducing HF content

Inactive Publication Date: 2020-03-27
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high temperature cycle performance of this additive combination is poor

Method used

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  • Electrolyte containing novel additive for lithium ion battery and lithium ion battery
  • Electrolyte containing novel additive for lithium ion battery and lithium ion battery
  • Electrolyte containing novel additive for lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment is used to illustrate the electrolyte solution for lithium-ion batteries disclosed in the present invention and its preparation method.

[0055] (1) Preparation of electrolyte:

[0056] Under argon atmosphere, the electrolyte solution is prepared in a vacuum glove box with a moisture content of 6 The concentration of lithium salt is 1.1mol / L, the content of VC is 1% of the total weight of the electrolyte, the content of PS is 2% of the total weight of the electrolyte, the content of LiFSI is 1% of the total weight of the electrolyte, add 1% of the total weight of the electrolyte The silicon-containing imidazole compound is named as compound 1, and mixed uniformly to obtain the lithium ion electrolyte of the present invention.

[0057] (2) Preparation of positive electrode sheet: Li[Ni 0.5 mn 0.2 co 0.3 ]O 2 : PVDF:SP=95:1:4 Mix evenly with 1-methyl-2-pyrrolidone, coat the mixed slurry on both sides of the aluminum foil, dry and roll to obtain the pos...

Embodiment 2～9 and comparative example 1～3

[0064] The concrete test method of embodiment 2~9 and comparative example 1~3 is consistent with embodiment 1, and its difference is: in embodiment 2~9 and comparative example 1~3, in the preparation step of electrolytic solution, electrolysis The components in mass percentages shown in Table 1 were added to the liquid respectively. Similarly, the components in mass percentage added in Example 1 are also listed in Table 1 for comparison. The test results of Examples 1-9 and Comparative Examples 1-3 are shown in Table 2.

[0065] The electrolyte composition of table 1 embodiment and comparative example

[0066] main solvent additive lithium salt Example 1 EC:EMC:DEC=1:1:1 VC 1%; PS 2%; LiFSI 1%; Compound 1 1% 1.1mol / L Example 2 EC:EMC:DEC=1:1:1 VC 1%; PS 2%; LiFSI 1%; Compound 2 1% 1.1mol / L Example 3 EC:EMC:DEC=1:1:1 VC 1%; PS 2%; LiFSI 1%; Compound 3 1% 1.1mol / L Example 4 EC:EMC:DEC=1:1:1 VC 1%; PS 2%; LiFSI 1%; Compoun...

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Abstract

The invention provides the electrolyte containing the novel additive for the lithium ion battery and the lithium ion battery, wherein the electrolyte can effectively improve the cycle performance, thestorage performance and the safety performance of the lithium ion battery. The electrolyte comprises an electrolyte main body and a silicon-containing diimidazole compound; the lithium ion battery comprises a positive plate, a negative plate, a diaphragm and the electrolyte, when the silicon-containing diimidazole compound is used as an electrolyte additive, an interface film with excellent electrochemical stability and ionic conductivity can be formed on an interface of a positive electrode material and a negative electrode material of the lithium ion battery; meanwhile, the additive has a Si-N bond structure, so that the additive can react with H<2>O / HF, the reaction of LiPF<6> and H<2>O is inhibited, the HF content is reduced, the storage stability and the thermal stability of the electrolyte are improved, and the high-temperature cycle performance of the battery is improved. The invention is applied to the field of lithium ion batteries.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrolyte solution for lithium ion batteries containing novel additives and a lithium ion battery. Background technique [0002] In order to adapt to the rapid development of power vehicles, energy storage devices, and digital electronic devices, it is urgent to further increase the energy density of lithium-ion batteries. One of the ways to improve is to use ternary high-voltage high-nickel materials. However, the nickel content in this material is high, and it has strong oxidation activity to the electrolyte. The battery made of this material has the problems of high-temperature storage and poor high-temperature cycle. At present, the commonly used solution is to find new positive and negative electrode film-forming additives to improve the interface conditions of the positive and negative electrodes of lithium-ion batteries, thereby improving the high-temperature stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 黄秋洁毛冲朱孟欧霜辉白晶于智力万广聪戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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