High temperature and high voltage resisting electrolyte for lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as narrow application temperature, limited application range, occurrence of combustion and explosion, and improve high temperature resistance and high voltage resistance , Improve cycle performance and improve high temperature performance

Active Publication Date: 2015-06-10
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The working voltage of a lithium-ion battery is determined by the positive electrode material of the battery. At present, high-voltage positive electrode materials with a working voltage of 4.35-5.0V have been obtained on the market; Therefore, improving the performance of the existing carbonate-based electrolyte and developing a high-voltage electrolyte that matches the high-voltage cathode material is one of the key issues that need to be solved urgently
In addition, the application temperature of lithium-ion batteries is relatively narrow, usually above 55°C, the battery capacity decays quickly, and even combustion and explosion may occur, which limits its application range. Therefore, it is also of great significance to study the high-temperature performance of lithium-ion batteries

Method used

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  • High temperature and high voltage resisting electrolyte for lithium ion battery
  • High temperature and high voltage resisting electrolyte for lithium ion battery
  • High temperature and high voltage resisting electrolyte for lithium ion battery

Examples

Experimental program
Comparison scheme
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Embodiment

[0039] Example: lithium salt LiPF 6 Concentration 1.0mol·L -1 , organic solvent EC:DMC=1:1 (mass ratio), additive tris(trimethylsilyl) borate, which accounts for 1% of the total mass of the electrolyte; it is defined as ref+1%TMSB;

Embodiment 1

[0043] In this embodiment, tris(trimethylsilyl) borate is added. The electrolyte composition is ref+1%TMSB. Add the electrolyte solution prepared above into the button battery.

[0044] The battery is tested for cycle performance according to the following process, and the results are as follows: figure 1 .

[0045] 0.2C constant current charge to 4.5V, 0.2C constant current discharge to 3.0V, cycle for 3 weeks, 0.5C constant current charge to 4.5V, 0.5C constant current discharge to 4.5V, cycle for 3 weeks, 1C constant current charge to 4.5V V, 1C constant current discharge to 4.5V, cycle 150 cycles.

Embodiment 2

[0050] In this embodiment, tris(trimethylsilyl) borate is added. The electrolyte composition is ref+1%TMSB. Add the electrolyte solution prepared above into the button battery.

[0051] The battery is tested for cycle performance according to the following process, and the results are as follows: image 3 .

[0052] 0.2C constant current charge to 4.6V, 0.2C constant current discharge to 3.0V, cycle for 3 weeks, 0.5C constant current charge to 4.6V, 0.5C constant current discharge to 4.6V, cycle for 3 weeks, 1C constant current charge to 4.6 V, 1C constant current discharge to 4.6V, cycle 150 cycles.

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Abstract

The invention relates to an electrolyte for a lithium ion battery. The electrolyte includes lithium salt, an organic solvent and an additive, and tris (trimethylsilyl) boron is adopted as the additive. The electrolyte is applied to the lithium ion battery, the work voltage of the electrolyte ranges from 4.5 V to 4.7 V, the work temperature range is the indoor temperature of 60 DEG C, the good high temperature and high voltage resisting circulating performance is achieved, and the high temperature and high voltage functional nonaqueous electrolyte is simple and easy to obtain.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolytes, in particular to a high-temperature and high-pressure-resistant multifunctional electrolyte for lithium-ion batteries, which is suitable for improving the high-temperature and high-pressure cycle performance of lithium-ion batteries. Background technique [0002] Due to the advantages of high energy density, high voltage platform, long life and environmental protection, lithium-ion batteries are widely used in energy storage electronic products, power tools and electric vehicles. In recent years, due to the development of intelligent, mobile and high-power-consuming electronic equipment, people are eager to increase the energy density of lithium-ion batteries. At present, increasing the working voltage of lithium-ion batteries is considered to be an effective way to increase their energy density. . In addition, obtaining lithium-ion batteries that can work efficiently in...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 闫春凤许莹夏建荣黄当睦刘新平祖利洲
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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