NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Title:

NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Document Type and Number:

Japanese Patent JP2002329529

Kind Code:

A

Abstract:

To improve a self-discharge characteristic of a nonaqueous electrolyte secondary battery provided with a nonaqueous electrolyte containing γ- butyrolactone.

This secondary battery is provided with an armoring material 1 having a thickness of ≤0.3 mm, a positive electrode 6 housed in the armoring material 1, a negative electrode 9 housed in the armoring material 1 and containing a carbonaceous substance capable of storing and releasing lithium ions, and the nonaqueous electrolyte housed in the armoring material 1 and containing a nonaqueous solvent containing γ-butyrolactone and an electrolyte dissolved in the nonaqueous solvent. The battery is characterized in that its voltage drop due to self-discharge at 60°C in a state having discharged by 0.2 C-3 V cut at room temperature is within 1.5 V after three weeks.

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Inventors:

SATO ASAKO
FUJIWARA MASAFUMI
KOIWA KAORU
SEKINO MASAHIRO
SHIMURA NAO
HASEBE HIROYUKI
OGUCHI MASAYUKI
KONUMA MASATAKA

Application Number:

JP2001269299A

Publication Date:

November 15, 2002

Filing Date:

September 05, 2001

Export Citation:

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Assignee:

TOSHIBA CORP

International Classes:

H01M2/02; H01M4/133; H01M4/36; H01M4/587; H01M10/05; H01M10/0525; H01M10/0565; H01M10/0566; H01M10/0569; (IPC1-7): H01M10/40; H01M2/02; H01M4/02; H01M4/58

Attorney, Agent or Firm:

Takehiko Suzue (6 outside)

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