Title:
NONAQUEOUS BATTERY
Document Type and Number:
Japanese Patent JP3236317
Kind Code:
B2
Abstract:
PURPOSE: To reduce the structural change of a nonaqueous secondary battery even if charging and discharging are repeated and to enhance the cycle characteristic of the battery by composing a positive electrode active material of composite oxides in which sodium is substituted for one part of the lithium of a lithium-cobalt oxide usually employed, the active material forming the nonaqueous secondary battery.
CONSTITUTION: A positive electrode active material is made by mixed metals composed mainly of LixNayMO2 wherein M represents cobalt or of cobalt, and containing a small amount of at least one kind of metal selected from nickel and manganese; in the formula, 0.20≤x≤1, 0.01≤y≤0.30, and 1.95≤z≤2.45. To manufacture the active material, oxides, hydroxides, carbonates, nitrates and organic acid salts or the like of metals Na and M are mixed together and baked in air or an oxygen atmosphere at 600-1000°C, preferably at 800-960°C. The substitution ratio of sodium is not limited but is desirably not less than 1% of the cobalt, preferably 2 to 20% in consideration for the discharge capacity and self discharge ratio of the battery.
Inventors:
Yoshio Suzuki
Emiko Yagi
Emiko Yagi
Application Number:
JP23136791A
Publication Date:
December 10, 2001
Filing Date:
September 11, 1991
Export Citation:
Assignee:
ASAHI KASEI KABUSHIKI KAISHA
International Classes:
H01M4/505; H01M4/525; H01M10/05; (IPC1-7): H01M4/58; H01M4/02; H01M10/40
Domestic Patent References:
| JP55136131A |