Title:
NEGATIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/164972
Kind Code:
A1
Abstract:
This negative electrode material for lithium secondary batteries is composed of a powder which is formed by sequentially carrying out, in the following order, a step wherein an etched foil is obtained by etching a foil that is mainly composed of Al, a step wherein particles are obtained by cutting the etched foil, and a step wherein the particles obtained by cutting the etched foil are further etched. Each particle constituting the powder has a size that is capable of passing through a 0.1-mm-opening sieve (based on JIS Z8801-1). The powder, which is an assembly of etched particles, has a specific surface area as determined by a BET method of 1.0 m2/g or more. This negative electrode material for lithium secondary batteries enables a lithium secondary battery to have a longer cycle life.
Inventors:
HISAYUKI KOJI (JP)
SAKAGUCHI MASASHI (JP)
KUROZUMI TADATOSHI (JP)
SAKAGUCHI MASASHI (JP)
KUROZUMI TADATOSHI (JP)
Application Number:
PCT/JP2013/062159
Publication Date:
November 07, 2013
Filing Date:
April 25, 2013
Export Citation:
Assignee:
SHOWA DENKO KK (JP)
International Classes:
H01M4/46; B22F1/00; B22F9/04; H01M4/134; H01M4/62
Domestic Patent References:
| WO2012050079A1 | 2012-04-19 | |||
| WO2012073815A1 | 2012-06-07 |
Foreign References:
| JPH08213053A | 1996-08-20 |
Attorney, Agent or Firm:
WATANABE, Akira et al. (JP)
Akira Watanabe (JP)
Akira Watanabe (JP)
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