NEGATIVE ELECTRODE PAINT FILM OF LITHIUM ION SECONDARY BATTERY AND LITHIUM ION SECONDARY BATTERY USING IT

Title:

NEGATIVE ELECTRODE PAINT FILM OF LITHIUM ION SECONDARY BATTERY AND LITHIUM ION SECONDARY BATTERY USING IT

Document Type and Number:

Japanese Patent JP2000294247

Kind Code:

A

Abstract:

To improve coating performance, paint film adhesion and discharge capacity even when natural graphite is used by including an acrylic acid polymer cross-linked by polyalkenyl polyether in a binding agent.

An acrylic acid polymer cross-linked by polyalkenyl polyether is 450,000 to 4,000,000 in the molecular weight, and the content in a negative electrode paint film is desirably 0.1 to 15.2 wt.%. A binding agent can include a cellulose material compatible with an organic solvent such as hydroxyethyl cellulose and a copolymer emulsion material compatible with water such as an acrylic-styrene copolymer emulsion as a component jointly used with this acrylic acid polymer. A required process is to set the blending composition ratio of the acrylic acid polymer in the binding agent to 5 to 95 wt.%. The content in the negative electrode paint film is desirably set to 2 to 16 wt.%.

Inventors:

OKAMOTO TOMOHITO
MURAI TETSUYA
OZEKI KATSUTOMO
SHIROHIGE MINORU
ENDO KOICHI

Application Number:

JP10377199A

Publication Date:

October 20, 2000

Filing Date:

April 12, 1999

Export Citation:

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Assignee:

HITACHI POWDERED METALS
GS MERUKOTEKKU KK
JAPAN STORAGE BATTERY CO LTD

International Classes:

H01M4/62; H01M4/133; H01M10/05; (IPC1-7): H01M4/62; H01M4/02; H01M10/40

Attorney, Agent or Firm:

Maejima Hajime

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