Title:
LITHIUM SECONDARY BATTERY AND MANUFACTURE OF ITS NEGATIVE ELECTRODE
Document Type and Number:
Japanese Patent JP3502118
Kind Code:
B2
Abstract:
PURPOSE: To increase the discharge potential and improve the charge/discharge cycle life by reforming the titanium compound of a negative electrode material.
CONSTITUTION: A lithium secondary battery is constituted of an electrolyte made of a nonaqueous solvent dissolved with lithium salt, a positive electrode 4 having the discharge potential of 2V or above against a counter electrode of Li/Li+, and a negative electrode 5 made of lithium titanate expressed by the general formula LixTiyO4 and capable of doping or de-doping lithium. The lithium titanate has the peak and peak intensity ratio of specific values when Cu is used as a target for X-ray diffraction, and values of (x), (y) in the general formula are specified. The crystal configuration hardly broken by doping and de-doping is formed, and the charge/discharge cycle life can be extended.
Inventors:
Nobuharu Koshiba
Nishimoto Emi
▲高▼田 堅一
Makoto Nakanishi
Nishimoto Emi
▲高▼田 堅一
Makoto Nakanishi
Application Number:
JP5724393A
Publication Date:
March 02, 2004
Filing Date:
March 17, 1993
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
C01B31/02; H01M4/131; H01M4/1391; H01M10/05; H01M10/0525; H01M10/0568; (IPC1-7): H01M4/58; H01M4/02; H01M10/40
Domestic Patent References:
| JP660867A | ||||
| JP6359507B2 |
Other References:
【文献】米国特許5147739(US,A)
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)