MANUFACTURING METHOD OF NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Title:

MANUFACTURING METHOD OF NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Document Type and Number:

Japanese Patent JP2001291513

Kind Code:

A

Abstract:

To manufacturing a negative electrode material of a good cycle life, wherein fine powder formation is suppressed by using a high theoretical capacity as a negative electrode material for a nonaqueous electrolyte secondary battery.

Alloy powder obtained by solidifying is fusion raw material of the composition which is designed to precipitate while an intermetallic compound of Si and Si are being solidified (lower in temperature than the alloy's liquid curve temperature, +500°C) by means of a gas atomization method is made to be the negative electrode material wherein one kind or more chosen from Ar, He and N2 is used as a spray gas. Particle size is controlled so that the powder particle diameter D(μm) not less than 80 vol% of alloy powder satisfies a formula D ≤[(2.5a-10b-3.8c)×102]1/1.5. In the formula, a b and c are respectively the volume fractions of Ar, He and N2 in the spray gas, and a+b+c=1.

Inventors:

OBIKA MOTOHARU
ASABE KAZUTAKA
TAKESHITA YUKITERU
NEGI NORIYUKI
YAMAMOTO SUKEYOSHI
NITTA YOSHIAKI
SHIMAMURA HARUNARI
OKAMURA KAZUHIRO

Application Number:

JP2000104832A

Publication Date:

October 19, 2001

Filing Date:

April 06, 2000

Export Citation:

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Assignee:

SUMITOMO METAL IND
MATSUSHITA ELECTRIC IND CO LTD

International Classes:

B22F9/08; B22F1/00; C22C1/04; C22C14/00; C22C19/00; H01M4/02; H01M4/38; (IPC1-7): H01M4/38; B22F1/00; B22F9/08; C22C1/04

Attorney, Agent or Firm:

Hirose Shoichi

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