Title:
【発明の名称】非水電解質二次電池
Document Type and Number:
Japanese Patent JP3021610
Kind Code:
B2
Abstract:
PURPOSE:To improve a charge and discharge cycle characteristic by making a positive electrode active material have a diffraction peak half-value width, on a (003) surface in the vicinity of CuKalpha<1>, 2theta=18 deg.--20 deg., 0.17 deg. or more and 0.30 deg. or less in a powder X-ray diffraction chart. CONSTITUTION:A battery has a positive electrode 1, positive electrode case 2, titane electricity collecting body 3, separator 4, lithium plate 5, sealing plate 6, and gasket 7. In this case, LiCoO2, in which a diffraction peak half-value width on a (003) surface in the vicinity of Cukalpha<1>, 2theta=18 deg.-20 deg. in a powder X-ray diffraction chart is 0.17 deg. or more and 0.30 deg. or less, is used for the positive electrode active material of the positive electrode 1. That is, the degree of freedom of a crystal itself is large in LiCoO2, in which crystal growth is not progressed, consequently a telescopic motion in the crystal is made easy, allowing the relaxation of resiliency between oxygen layers in a charging condition and the restraint of the collapse of a crystal structure. This can improve a charge and discharge cycle characteristic.
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Inventors:
Akiyoshi Nishiyama
Shu Koshina
Hiromi Okuno
Shu Koshina
Hiromi Okuno
Application Number:
JP29580490A
Publication Date:
March 15, 2000
Filing Date:
October 31, 1990
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H01M10/05; H01M4/525; H01M10/0525; (IPC1-7): H01M4/58; H01M4/02; H01M10/40
Domestic Patent References:
| JP3272564A | ||||
| JP433260A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)