Title:
MANUFACTURE OF POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY
Document Type and Number:
Japanese Patent JP3008793
Kind Code:
B2
Abstract:
PURPOSE: To make a crystal structure to be of a single phase, and thereby obtain an oxide high in crystal finishing degree by mixing coprecipitated hydrooxide which is obtained by adding alkali solution to the mixed water solution of manganese salts and nickel salts, with lithium compounds, and thereby sintering a products thus obtained at a specified temperature.
CONSTITUTION: In the manufacture of a composite oxide for positive electrode active material indicated by a formula, alkali water solution is added first to the mixed water solution of manganese salt and nickel salt the amounts of which are divided by a specified volumetric ratio, so as to be coprecipitated, the product is then filtered and cleaned with water, and a manganese nickel hydrooxide is thereby obtained thereafter. It is proved by a X ray diffraction that the product is roughly of a single phase, and thereby its crystal finishing degree is high. Next, a specified amount of a lithium compound such as lithium hydrooxide and the like is mixed to the aforesaid composite hydrooxide so as to be sintered, and a composite oxide containing lithium with a crystal structure in which Li is easily moved, is thereby obtained. Furthermore, since its sintering temperature is set to be 600 to 800°C, there occurs no disturbance in a crystal structure. By this constitution, the positive electrode active material can be obtained, which is high in capacity and excellent in cyclic characteristics. (in the formula, x is defined by 0.95≥x≥0.70).
Inventors:
Junichi Yamaura
Kazuhiro Okamura
Yoshiaki Nitta
Kazuhiro Okamura
Yoshiaki Nitta
Application Number:
JP31314094A
Publication Date:
February 14, 2000
Filing Date:
December 16, 1994
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
C01G53/00; H01M4/505; H01M4/525; H01M10/05; (IPC1-7): H01M4/58; C01G53/00; H01M4/02; H01M10/40
Domestic Patent References:
| JP5299092A | ||||
| JP6203829A | ||||
| JP4267053A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)
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