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High-voltage lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of electrolyte, can solve the problems of difficulty in meeting high-voltage high-temperature storage and high-temperature cycle performance, achieve good practicability and economic value, and improve the effect of high-temperature cycle and high-temperature storage performance

Active Publication Date: 2022-04-12
GUANGZHOU TINCI MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the battery voltage increases to 4.45V or higher, the existing technology is obviously difficult to meet the high-voltage high-temperature storage and high-temperature cycle performance, so it is necessary to provide a more effective high-voltage additive to meet the needs of further battery voltage increase

Method used

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  • High-voltage lithium ion battery electrolyte and lithium ion battery
  • High-voltage lithium ion battery electrolyte and lithium ion battery
  • High-voltage lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 The preparation method of high-voltage lithium-ion soft pack battery is as follows:

[0025] According to the capacity design of the battery, the capacity of the positive and negative electrode materials determines the coating area density. The positive electrode active material is a ternary high-voltage positive electrode material purchased from Zhenhua New Materials; the negative electrode active material is artificial graphite purchased from Zhenhua New Materials; the diaphragm is a PE-coated ceramic diaphragm with a thickness of 20 μm purchased from Xingyuan Material;

[0026] The positive electrode preparation step is: mix lithium cobaltate, conductive carbon black and binder polyvinylidene fluoride in a mass ratio of 96.8:2.0:1.2, and disperse them in N-methyl-2-pyrrolidone to obtain positive electrode slurry, Apply the positive electrode slurry evenly on both sides of the aluminum foil, dry, calender and vacuum dry, and weld the aluminum lead-out wir...

Embodiment 2～4

[0032] The preparation method of the positive and negative electrodes and the lithium-ion battery of Examples 2 to 4 is the same as that of Example 1, and the preparation method of the electrolyte is also the same as that of Example 1, except that the 1,4-benzenedi(trimethyl The mass percentages of silane) borate are 1%, 3% and 5%, respectively.

Embodiment 5

[0034] The preparation method of the positive and negative electrode sheets and the lithium ion battery of embodiment 5 is the same as that of embodiment 1, and the preparation method of the electrolyte is also the same as that of embodiment 1, except that 0.5% vinylene carbonate (VC) and 0.5% vinylene carbonate (VC) and 3% 1,4-Benzene bis(trimethylsilane) borate.

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Abstract

The invention relates to the field of electrolytes, and provides a high-voltage lithium ion battery and an electrolyte, the electrolyte comprises a non-aqueous solvent, a lithium salt and an additive, and the additive comprises 1, 4-benzene bis (trimethylsilane) borate. By adding the 1, 4-benzene bis (trimethylsilane) boric acid ester into the electrolyte, the high-temperature cycle and high-temperature storage performance of the battery are remarkably improved.

Description

Technical field: [0001] The invention relates to the field of electrolytes, in particular to a high-voltage lithium-ion battery electrolyte and a lithium-ion battery containing the electrolyte. Background technique: [0002] Before 2030, China strives to reach the peak of its total carbon emissions and achieve carbon neutrality by 2060. In this context, China has increased the popularity of electric vehicles in order to reduce the carbon dioxide emissions of traditional fuel vehicles. Lithium batteries are the core components of electric vehicles, and battery mileage is an important reference for purchasing electric vehicles. Improving the energy density of lithium batteries can enable electric vehicles to achieve better cruising range. [0003] The methods to increase energy density are: 1. Develop and use higher-capacity positive and negative electrode materials; 2. Increase battery voltage. As the battery voltage further increases, the electrolyte is more likely to oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCY02E60/10
Inventor 麦鍠旺刘蕊周立马美朋
Owner GUANGZHOU TINCI MATERIALS TECH