LITHIUM SECONDARY BATTERY - Toshiba Corporation

Title:

LITHIUM SECONDARY BATTERY

Document Type and Number:

Japanese Patent JP3556270

Kind Code:

B2

Abstract:

PURPOSE: To increase high rate performance, discharge capacity, and cycle life by using a carbonaceous material mainly comprising specified fibrous carbon powder in which graphite crystalline orientation in cross section is radiate in a negative electrode.
CONSTITUTION: An insulator 2 is placed on a bottom of a stainless steel cup- shaped container 1, and an electrode group 3 is accommodated into the container 1. The electrode group 3 has structure obtained by sequentially stacking a positive electrode 4, a separator 5, and a negative electrode 6 in a belt shape, then spirally winding so that the negative electrode 6 is positioned on the outside. The negative electrode 6 has structure obtained by supporting a carbonaceous material capable of absorbing/desorbing lithium ions on a current collector by a binder, and the carbonaceous material mainly comprises fibrous carbon powder in which graphite crystalline orientation in cross section is radiated. Since 50 or more volume percent of the fibrous carbon powder is arranged so that direction of fiber length exists in an angle range of 0°±45° to the surface of the current collector, insertion/releasing reaction of lithium ions from the side surface of the powder is made easy. Thereby, high rate performance is enhanced.

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Inventors:

Norio Takami
Takahisa Osaki
Yoshiaki Azami

Application Number:

JP13322294A

Publication Date:

August 18, 2004

Filing Date:

June 15, 1994

Export Citation:

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Assignee:

Toshiba Corporation
Toshiba Battery Co., Ltd.

International Classes:

C01B31/02; C01B31/04; D01F9/145; D01F11/12; H01M4/587; H01M4/66; H01M10/05; H01M10/0566; H01M6/10; (IPC1-7): H01M4/58; H01M4/02; H01M10/40

Domestic Patent References:

JP6168725A
JP6150931A
JP4237971A
JP6132032A
JP64000645A

Attorney, Agent or Firm:

Takehiko Suzue

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