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Method for improving storage performance of lithium cobalt oxide at high voltage and high temperature

A storage performance, high-voltage technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of material structure collapse, severe battery gas, battery gas, etc., to reduce the expansion rate, increase the charging voltage, and reduce the probability of contact Effect

Inactive Publication Date: 2013-08-07
北京盟固利新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although increasing the charging voltage can increase the discharge specific capacity, it will lead to the collapse of the internal structure of the material. The material is in a state of excessive delithiation, which is very unstable in the organic electrolyte, and the oxygen loss reaction will occur, and the battery will be flattened. The increase, the flatulence of the battery is also more serious

Method used

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  • Method for improving storage performance of lithium cobalt oxide at high voltage and high temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The product synthesized in the comparative example was used as a raw material, and the surface treatment agent zirconia was added for surface coating treatment. The mass ratio of zirconia to the product synthesized in the comparative example was 0.2%, and the modified product was obtained by grinding for 1 hour. Median particle size D of surface treatment agent 50 No more than 5μm, the median particle size D of the modified lithium cobalt oxide product 50 10.0~20.0μm, D 100 ≤70μm.

[0028] The modified product was used as the positive electrode material to make a battery. After formation, the battery was charged to 4.4V and stored at 85°C for 8 hours. The thickness of the battery before and after storage was 4.71mm and 6.86mm, and the expansion rate of the battery was 45.6%.

Embodiment 2

[0030] The product synthesized in the comparative example was used as a raw material, and the surface treatment agent nano-aluminum powder was added for surface coating treatment. The mass ratio of the nano-aluminum powder to the product synthesized in the comparative example was 0.2%, and mixed for 1 hour to obtain a modified product. The median particle size D of the modified lithium cobalt oxide product 5010.0~20.0μm, D 100 ≤70μm.

[0031] The modified product was used as the positive electrode material to make a battery. After formation, the battery was charged to 4.4V and stored at 85°C for 8 hours. The thickness of the battery before and after storage was 4.76mm and 6.00mm, and the expansion rate of the battery was 26.1%.

Embodiment 3

[0033] With the product synthesized in the comparative example as raw material, add surface treatment agent nano-aluminum powder, it is carried out surface coating treatment, the mass ratio of nano-aluminum powder and the product synthesized in the comparative example is 0.2%, shear in the vibrator After 30 minutes, the modified product was obtained. The median particle size D of the modified lithium cobalt oxide product 50 10.0~20.0μm, D 100 ≤70μm.

[0034] The modified product was used as the positive electrode material to make a battery. After formation, the battery was charged to 4.4V and stored at 85°C for 8 hours. The thickness of the battery before and after storage was 4.80mm and 5.45mm, and the expansion rate of the battery was 13.5%.

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Abstract

The invention relates to the field of lithium ion battery material, especially relates to a method for improving storage performance of lithium cobalt oxide at high voltage and high temperature. The traditional two stage method is employed by the invention, and comprises the following steps: adding special additives and controlling high temperature reaction temperature, obtaining lithium cobalt oxide products of particle size which accords with the requirement, doping additives into the lithium cobalt oxide structure, thereby guaranteeing the structure stability of lithium cobalt oxide during excess lithium removing under high voltage. The key step is that the synthesized finished product lithium cobalt oxide which accords with the requirement is used as raw material, a very simple surface treatment is used without high temperature treatment once more, thereby greatly improving high temperature storage performance under high voltage.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a method for improving the high-temperature storage performance of lithium cobaltate under high voltage. Background technique [0002] With the rapid development of digital products, mobile communication tools and electric vehicles, lithium-ion secondary batteries are used more and more and play an increasingly important role. At present, commercial lithium-ion battery cathode materials mainly include: lithium cobaltate, spinel lithium manganate, lithium iron phosphate, ternary cathode materials and lithium nickelate cathode materials. Lithium cobaltate has good cycle performance, high compaction density, and easy synthesis. It is the earliest commercialized and most mature cathode material. Spinel lithium manganese oxide is cheap, rich in resources, and has excellent rate discharge performance, but its high temperature performance needs to be further improved, so it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62
CPCY02E60/122Y02E60/10
Inventor 张春玲江卫军魏卫高月张溪苏迎春朱晓沛庞自钊白珍辉郝振佳崔妍
Owner 北京盟固利新材料科技有限公司
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