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Negative electrode material for lithium ion secondary battery, negative electrode sheet for lithium ion secondary battery, and lithium secondary battery

A secondary battery and negative electrode material technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of small capacity and large irreversible capacity

Inactive Publication Date: 2015-08-12
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It is known that amorphous carbon materials can be used even under rapid charge and discharge because they can be charged from a low potential region where graphite cannot be charged, but they have disadvantages such as significant cycle degradation, large irreversible capacity, and small capacity

Method used

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  • Negative electrode material for lithium ion secondary battery, negative electrode sheet for lithium ion secondary battery, and lithium secondary battery
  • Negative electrode material for lithium ion secondary battery, negative electrode sheet for lithium ion secondary battery, and lithium secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0147] 70 parts by mass of artificial graphite (A) and 30 parts by mass of carbon material (B) were placed in a high-speed mixer made by Fuji Pandal, and mixed for 5 minutes to obtain a negative electrode material. The obtained negative electrode material has a D50 of 8.2 μm and a BET specific surface area of ​​2.6 m 2 / g. Electrodes and battery cells were produced using this negative electrode material, and battery characteristics were evaluated. The results are shown in Table 1.

Embodiment 2

[0149] Except changing the amount of artificial graphite (A) to 50 parts by mass, and the amount of carbon material (B) to 50 parts by mass, a negative electrode material, an electrode, and a battery cell were produced in the same manner as in Example 1. The obtained negative electrode material has a D50 of 9.9 μm and a BET specific surface area of ​​2.6 m 2 / g. The battery characteristics are shown in Table 1.

Embodiment 3

[0151] Except changing the amount of artificial graphite (A) to 30 parts by mass and the amount of carbon material (B) to 70 parts by mass, a negative electrode material, an electrode, and a battery cell were produced in the same manner as in Example 1. The obtained negative electrode material has a D50 of 11.4 μm and a BET specific surface area of ​​2.5 m 2 / g, the battery characteristics are shown in Table 1.

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Abstract

　This negative electrode material for a lithium ion secondary battery is characterised by comprising a mixture of: artificial graphite (A) for which the spacing (d(002)) of the (002) surface of the graphite structure, as measured using powder X-ray diffractometry, is in the range 0.335-0.339nm, and the particle diameter (D50) for which the volume total frequency of the particle size distribution measured using laser diffractometry is 50% is 4-10μm; and a carbon material (B) for which d(002) is at least 0.340nm, and D50 is 7-17μm and is greater than the D50 of the artificial graphite (A).

Description

technical field [0001] The invention relates to a negative electrode material which can be made into a lithium-ion secondary battery with excellent high-speed charging characteristics while maintaining high output power and high energy density. Moreover, this invention relates to the negative electrode sheet for lithium ion secondary batteries using this negative electrode material, and a lithium secondary battery. Background technique [0002] Lithium-ion secondary batteries are used not only as power sources for portable electronic devices, but also as power sources for electric tools, electric vehicles, and the like in recent years. Electric vehicles such as battery electric vehicles (BEV) and hybrid electric vehicles (HEV) are required to maintain high charge-discharge cycle characteristics for more than 10 years, have sufficient high-current load characteristics to drive high-power motors, and High volumetric energy density for extended cruising distance. In particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/133H01M4/1393H01M4/36
CPCY02E60/122H01M4/133H01M4/1393H01M4/587H01M10/0525Y02E60/10
Inventor 原田大辅武内正隆石井伸晃利根川 明央
Owner SHOWA DENKO KK
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