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Carbon materials for lithium ion secondary batteries, negative electrode materials for lithium ion secondary batteries, and lithium ion secondary batteries

一种二次电池、碳材料的技术，应用在二次电池、电池电极、锂蓄电池等方向，能够解决无法充分得到充放电效率等问题，达到优异充放电效率、高充放电容量的效果

Active Publication Date: 2016-04-06
WARRIOR & ASSOC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when hard carbon is used as the negative electrode material, although the stability of the lithium-ion secondary battery during the charge-discharge cycle can be improved, and its high-current input-output characteristics can be improved, there is a problem that the charge-discharge efficiency cannot be sufficiently obtained.

Method used

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  • Carbon materials for lithium ion secondary batteries, negative electrode materials for lithium ion secondary batteries, and lithium ion secondary batteries
  • Carbon materials for lithium ion secondary batteries, negative electrode materials for lithium ion secondary batteries, and lithium ion secondary batteries
  • Carbon materials for lithium ion secondary batteries, negative electrode materials for lithium ion secondary batteries, and lithium ion secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A）

[0279] Phenolic resin PR-217 (manufactured by Sumitomo Bakelite Co., Ltd.) as a resin composition was processed in the order of the following steps (a) to (f) to obtain hard carbon particles.

[0280] (a) Under the conditions of reducing gas replacement, inert gas replacement, reducing gas flow, and inert gas flow, the temperature is raised from room temperature to 500°C at 100°C / hour

[0281] (b) Under the conditions of reducing gas replacement, non-reactive gas replacement, reducing gas circulation, and non-reactive gas circulation, after degreasing treatment at 500 ° C for 2 hours, cool

[0282] (c) Finely pulverize with a vibrating ball mill

[0283] (d) Under the replacement and circulation of inert gas (nitrogen), the temperature is raised from room temperature to 1200°C at 100°C / hour

[0284] (e) Carbonization treatment at 1200°C for 8 hours under the circulation of inert gas (nitrogen)

[0285] (f) Under the circulation of inert gas (nitrogen), let cool to 600°C natu...

Embodiment 2A～5A）

[0288] A carbon material was obtained in the same manner as in Example 1A above except that the contents of graphite particles and hard carbon particles were changed as shown in Table 1.

Embodiment 6A）

[0290] In Example 1A above, aniline resin (synthesized by the following method) was used instead of phenolic resin.

[0291] Put 100 parts of aniline, 697 parts of 37% formaldehyde solution, and 2 parts of oxalic acid into a three-necked flask equipped with a stirring device and a condenser, react at 100°C for 3 hours, and then dehydrate to obtain 110 parts of aniline resin. The obtained aniline resin had a weight average molecular weight of about 800.

[0292] A resin composition obtained by pulverizing and mixing 100 parts of aniline resin and 10 parts of hexamethylenetetramine obtained above was treated in the same procedure as in Example 1A above to obtain a carbon material.

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Abstract

The carbon material for lithium-ion secondary batteries of the present invention is a carbon material for lithium-ion secondary batteries, and is characterized in that it contains hard carbon and graphite as its main material, and when the content of graphite is A [% by weight] , When the content of hard carbon is B [% by weight], the relationship of 1.2≦A / B≦19 is satisfied, and the content of graphite is 55% by weight to 95% by weight. Thereby, it is possible to provide a carbon material for a lithium ion secondary battery, a negative electrode material for a lithium ion secondary battery, and a lithium ion secondary battery having the above-mentioned characteristics that can be obtained in a well-balanced manner with a high charge-discharge capacity and excellent charge-discharge efficiency. . In addition, the content of hard carbon is preferably 5% by weight to 45% by weight.

Description

technical field [0001] The invention relates to a carbon material for a lithium ion secondary battery, a negative electrode material for a lithium ion secondary battery and a lithium ion secondary battery. Background technique [0002] Conventionally, a carbon material is used as a constituent material (negative electrode material) of a negative electrode of a lithium ion secondary battery. This is because even if the charge-discharge cycle of the lithium-ion secondary battery is repeated, lithium dendrites are not easily deposited on the negative electrode using the carbon material, and safety can be ensured. [0003] Graphite has been used as such a carbon material because it can improve the charge and discharge efficiency of a lithium ion secondary battery (for example, refer to Patent Document 1). However, when graphite is used as the negative electrode material, there are disadvantages that the charge and discharge capacity of the lithium ion secondary battery when the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587C01B31/02H01M4/36
CPCC01B32/00C01B32/20H01M4/364H01M4/587H01M10/0525H01M10/052Y02E60/10Y10T428/2982C01B32/05H01M4/583H01M4/62
Inventor 佐佐木龙朗市川裕一
Owner WARRIOR & ASSOC INC
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