Lithium cobalt oxide digital lithium ion battery for high and low temperatures

A lithium ion battery, 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 kinetic performance, excellent high temperature performance and Excellent effect of low temperature performance, high and low temperature performance

Active Publication Date: 2019-06-25
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Lithium cobalt oxide digital lithium ion battery for high and low temperatures
  • Lithium cobalt oxide digital lithium ion battery for high and low temperatures

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specific Embodiment approach 1

[0010] Specific embodiment one: This embodiment records a lithium cobalt oxide digital lithium ion battery with 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 lithium cobalt oxide cathode 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 sultone compound and polycarbonate. Nitrile compounds, the sultone compound accounts for 3.0% to 10% of the mass fraction of the electrolyte. The lithium cobalt oxide positive electrode doping coating treatment is specifically obtained by first doping and sintering at a high temperature of 1000-1100°C, and then undergoing a secondary high-temperature coating modification treatment at 800-1000°C.

[0011] Studies have shown that when the sultone compound content in the electrolyte is highe...

specific Embodiment approach 2

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

specific Embodiment approach 3

[0013] Specific embodiment three: In the high and low temperature lithium cobalt oxide digital lithium ion battery described in specific embodiment 1, the mass fraction of the polynitrile compound in the electrolyte is 0.1%-10%.

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Abstract

The invention relates to a lithium cobalt oxide digital lithium ion battery for high and low temperatures, and belongs to the technical field of lithium ion batteries. The invention aims at solving the problems that an existing lithium ion battery is not ideal in impedance and high and low temperature performance, and the lithium cobalt oxide digital lithium ion battery comprises a lithium cobaltoxide positive electrode, a high-capacity artificial graphite negative electrode and a non-aqueous electrolyte. The lithium cobalt oxide positive electrode is subjected to doping and coating treatment, and the non-aqueous electrolyte is an organic compound dissolved in a solvent containing cyclic carbonate and chain carbonate, wherein the organic compound is a sultone compound and a polynitrile compound, and the sultone compound accounts for 3.0%-10% of the electrolyte by mass. The high-content sulfonate compound electrolyte does not influence the performance exertion of the positive and negative electrode materials, so that the lithium ion battery has very excellent high-temperature performances and low-temperature performances.

Description

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

Claims

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Application Information

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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
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