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Method for modifying carbon negative polar material

A carbon negative electrode material and technology of negative electrode materials, applied in the field of electrochemical materials, can solve problems such as cycle performance degradation, poor adhesion, and limited selection of negative electrode materials.

Inactive Publication Date: 2005-12-21
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the adhesion between the prepared negative electrode material and the negative electrode current collector is even worse, resulting in a decrease in cycle performance and limiting the variety of optional negative electrode materials

Method used

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  • Method for modifying carbon negative polar material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 100 grams of MCMB10-28 (manufactured by Osaka Gas Co., Ltd., Japan) was mixed with 500 grams of lithium hydroxide aqueous solution containing 1 wt%, and reacted at 30° C. for 80 hours. Then wash until the pH is 7.5, and dry in a drying oven to obtain a modified carbon negative electrode material.

[0024] The preparation of the negative electrode was the same as that of Comparative Example 1, and the test of electrochemical performance was the same as that of Comparative Example 1 except that the modified negative electrode material obtained in this example was used as the negative electrode material. The relationship between capacity retention and cycle number is shown in figure 1 . The figure shows that after 50 cycles, the capacity retention is 95.1%.

Embodiment 2

[0028] Mix 100 grams of CMS (manufactured by Shanghai Shanshan Technology Co., Ltd.) with 300 grams of lithium carbonate aqueous solution containing 5 wt%, and react at 100°C for 2 hours. Then it was washed until the pH was 7.0, and dried in a drying oven to obtain a modified carbon negative electrode material.

[0029] The preparation of the negative electrode was the same as that of Comparative Example 1, and the test of electrochemical performance was the same as that of Comparative Example 1 except that the modified negative electrode material obtained in this example was used as the negative electrode material. The relationship between capacity retention and cycle number is shown in figure 1 . The figure shows that after 50 cycles, the capacity retention is 97.0%.

Embodiment 3

[0033] 100 grams of spherical graphite with a carbon content greater than 99.9% (produced by Shandong Qingdao Taineng Graphite Co., Ltd.) was mixed with 100 grams of 10 wt% lithium nitrate aqueous solution, and reacted at 60° C. for 24 hours. Then wash until the pH is 6.5, and dry in a drying oven to obtain a modified carbon negative electrode material.

[0034] The preparation of the negative electrode was the same as that of Comparative Example 1, and the test of electrochemical performance was the same as that of Comparative Example 1 except that the modified negative electrode material obtained in this example was used as the negative electrode material. The relationship between capacity retention and cycle number is shown in figure 1 . The figure shows that after 50 cycles, the capacity retention is 98.0%.

[0035] It can be seen from the comparative examples and corresponding examples that the modified carbon negative electrode material produced by the present inventio...

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Abstract

The method modifies surface of material of carbon cathode by using compound of containing lithium so as to obtain material of carbon cathode of lithium ion cell. The material of carbon cathode produced according to the disclosed method possesses full even surface structure. Favorable cohesiveness and cycle performance is possessed between cathodes prepared from the material and afflux body of cathode. Advantages of the invention are: good operability and repeatability, and stable product quality.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, and in particular relates to a method for modifying a carbon negative electrode material. More specifically, the invention relates to a method for modifying the surface of a carbon negative electrode material by a lithium-containing compound. The present invention also relates to the lithium ion battery negative electrode material obtained by the above method. Background technique [0002] As we all know, due to the specific layered structure of carbon materials, lithium ions can be reversibly intercalated and deintercalated; at the same time, the potential of lithium intercalation and deintercalation is not much different from that of metal lithium, so it can be used as a negative electrode material for lithium ion batteries (such as Wu Yuping, et al., "Lithium Ion Secondary Batteries", Chapter Three, pages p86-112, 2002, Chemical Industry Press; Wu Yuping, "Lithium Ion Batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04
CPCY02E60/10
Inventor 张汉平吴宇平吴浩青
Owner FUDAN UNIV
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