Electrolyte additive for improving low-temperature properties of lithium ion battery and electrolyte

An electrolyte additive and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as inability to balance normal temperature and high temperature performance

Inactive Publication Date: 2018-07-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this problem is improved only by increasing the content of low-melting point and low-viscosity solvents, the low-temperature performance

Method used

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  • Electrolyte additive for improving low-temperature properties of lithium ion battery and electrolyte
  • Electrolyte additive for improving low-temperature properties of lithium ion battery and electrolyte
  • Electrolyte additive for improving low-temperature properties of lithium ion battery and electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10

[0019] The composition of the lithium-ion battery electrolyte containing additives is given in Examples 1-10, and the electrolyte is injected into an aluminum shell 38Ah ternary NCM523 lithium-ion battery at -10°C, 25°C and 50°C respectively The capacity retention rate was tested after 200 cycles of down cycle, and the electrolyte composition and capacity retention rate test data are shown in Table 1.

[0020] Electrolyte composition and capacity retention data of table 1 embodiment 1-10

[0021]

[0022]

[0023]

[0024] It can be seen from the above table 1 that the electrolyte prepared by the present invention is injected into the aluminum shell 38Ah ternary NCM523 system lithium-ion battery, and the capacity retention rate is the highest when compared with the battery without additives after 200 cycles at -10°C The growth rate is about 3%, and the performance is not affected at room temperature and high temperature.

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PUM

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Abstract

The invention discloses an electrolyte additive for improving low-temperature properties of a lithium ion battery and electrolyte and relates to the technical field of lithium ion batteries. The additive is pyridine with an electron donor group substitution group, and in addition, the molecular structure of the additive is free of intense electron withdrawing group substitution group. When the additive is applied to lithium ion battery electrolyte, the ion conduction velocity of the electrolyte under a low-temperature condition can be increased, the curing point of the electrolyte can be reduced, the charge and discharge capacity and the circulation performance of the lithium ion battery at a low temperature can be improved, meanwhile the wettability of an anode piece and a cathode piece can be improved. The additive does not affect the performance of a battery cell at normal temperatures and high temperatures, and is gentle to the environment.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte additive and electrolyte for improving the low-temperature performance of lithium-ion batteries. Background technique [0002] In recent years, due to the increasing requirements for environmental protection and the guidance of the government's policy to accelerate the development of new energy vehicles, many countries in the world have announced bans on the sale of fuel vehicles. Under the continuous stimulation of new energy vehicle incentive policies, the market demand has doubled. However, due to the large differences in the use environment of the battery and the wide geographical span, and the development of lithium-ion batteries towards the aviation field, the existing lithium battery electrolyte is mainly composed of organic solvents, lithium salts and additives. The conductivity is worse, and the low-temperature performance of current lithium...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 叶加久厉运杰宋红芳郝虹阳徐庆庆
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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