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A lithium cobalt oxide digital lithium-ion battery with both high and low temperature

A lithium-ion battery and lithium cobalt oxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of lithium-ion battery impedance and unsatisfactory high and low temperature performance, and achieve good dynamic performance, small cycle expansion, The effect of excellent high temperature performance and low temperature performance

Active Publication Date: 2021-10-29
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of unsatisfactory impedance and high and low temperature performance of the existing lithium ion battery, and provide a lithium cobalt oxide digital lithium ion battery with both high and low temperature

Method used

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  • A lithium cobalt oxide digital lithium-ion battery with both high and low temperature
  • A lithium cobalt oxide digital lithium-ion battery with both high and low temperature

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specific Embodiment approach 1

[0010] Specific embodiment 1: This embodiment describes a lithium cobalt oxide digital lithium-ion battery with both high and low temperature, including a lithium cobalt oxide positive electrode, an artificial graphite negative electrode with a gram capacity ≥ 355mAh / g, and a non-aqueous electrolyte. The positive electrode of lithium cobaltate is doped and coated; the non-aqueous electrolyte is an organic compound dissolved in a solvent containing cyclic carbonate and chain carbonate, and the organic compound is a sultone compound and poly For the nitrile compound, the mass fraction of the sultone compound in the electrolyte is 3.0%-10%. The lithium cobaltate positive electrode doping and coating treatment specifically includes: firstly doping and sintering at a high temperature of 1000-1100° C., and then undergoing a second high-temperature coating modification treatment of 800-1000° C. to synthesize.

[0011] Studies have shown that when the content of the sultone compound i...

specific Embodiment approach 2

[0012] Specific embodiment two: a kind of lithium cobalt oxide digital lithium ion battery of high and low temperature described in specific embodiment one, described polynitrile compound is succinonitrile, adiponitrile, 1,3,6-hexane A mixture of one or more of trinitrile, glutaronitrile or suberonitrile. The polynitrile compound can form a protective film on the surface of the lithium cobaltate positive electrode, which can significantly improve the high-temperature performance of the lithium-ion battery.

specific Embodiment approach 3

[0013] Embodiment 3: In Embodiment 1, a high-low temperature lithium cobaltate digital lithium-ion battery, the mass fraction of the polynitrile compound in the electrolyte is 0.1%-10%.

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Abstract

The invention discloses a lithium cobalt oxide digital lithium ion battery with both high and low temperature, which belongs to the technical field of lithium ion batteries. The object of the present invention is to solve the problem of unsatisfactory impedance and high and low temperature performance of the existing lithium ion battery. The lithium cobalt oxide digital lithium ion battery of the present invention includes a lithium cobalt oxide positive electrode, a high-capacity artificial graphite negative electrode and a non-aqueous electrolyte , the lithium cobalt oxide positive electrode has been doped and coated; the non-aqueous electrolyte is an organic compound dissolved in a solvent containing cyclic carbonate and chain carbonate, and the organic compound is sulfonic acid For the ester compound and the polynitrile compound, the mass fraction of the sultone compound in the electrolyte is 3.0%-10%. The high-content sulfonate compound electrolyte will not affect the performance of the positive and negative electrode materials, so the lithium-ion battery has excellent high-temperature performance and low-temperature performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium cobalt oxide digital lithium ion battery with both high and low temperature. Background technique [0002] Since the commercialization of lithium-ion batteries, due to its high specific energy and good cycle performance, it has been widely used in digital fields such as notebooks and mobile phones. With the widespread application of lithium-ion batteries, their use environments tend to be more diverse. Consumers expect lithium-ion batteries to have excellent performance under high and low temperature conditions. For example: in areas with relatively low temperature, notebooks can also work normally, requiring lithium-ion batteries to have good low-temperature discharge performance. In areas where the temperature is relatively high, it is expected that high temperature will not have a significant impact on the life of lithium-ion batteries, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0567H01M4/131H01M4/133H01M4/485H01M4/525H01M4/587
CPCY02E60/10
Inventor 王海刘春洋曾家江李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD