CARBON MATERIAL FOR NEGATIVE ELECTRODE OF LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

Title:

CARBON MATERIAL FOR NEGATIVE ELECTRODE OF LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

Document Type and Number:

Japanese Patent JP2014154444

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To provide a carbon material for a negative electrode of a lithium ion secondary battery capable of preventing reduction in charge movement resistance and reduction in capacity under a low-temperature environment when used for a lithium ion secondary battery, and to provide the lithium ion secondary battery employing the same.SOLUTION: A carbon material for a negative electrode of a lithium ion secondary battery is obtained by pulverizing a graphite material. The carbon material for the negative electrode of the lithium ion secondary battery has a 50% volume cumulative diameter of 0.8 μm or more and 4.0 μm or less, and a volume average particle diameter distribution having a second peak of the highest appearance frequency, and a first peak which is positioned at the side of a smaller particle diameter than the second peak. The carbon material for the negative electrode of the lithium ion secondary battery has a specific surface area according to the BET method of 20 m/g or more and 50 m/g or less. The carbon material for the negative electrode of the lithium ion secondary battery is used by pre-doping lithium. The lithium ion secondary battery is also disclosed which includes the carbon material for the negative electrode in which lithium is pre-doped.

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Inventors:

IDO TAKAHIKO
TAKAGI TAKUYA

Application Number:

JP2013024770A

Publication Date:

August 25, 2014

Filing Date:

February 12, 2013

Export Citation:

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Assignee:

IBIDEN CO LTD

International Classes:

H01M4/587; C01B31/04

Attorney, Agent or Firm:

Patent business corporation あいち international patent firm

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