Lithium manganese oxide compound

Patent 5153081 Issued on October 6, 1992. Estimated Expiration Date:

July 27, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2562705

MnO₂ derived from LiMn₂ O₄
Patent #: 4246253
Issued on: 01/20/1981
Inventor: Hunter

Manganese dioxide
Patent #: 4277360
Issued on: 07/07/1981
Inventor: Mellors , et al.

Non-aqueous secondary cell
Patent #: 4758484
Issued on: 07/19/1988
Inventor: Furukawa , et al.

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Patent #: 4828834
Issued on: 05/09/1989
Inventor: Nagaura , et al.

Cathode active materials, methods of making same and electrochemical cells incorporating the same
Patent #: 4959282
Issued on: 09/25/1990
Inventor: Dahn, et al.

Method of synthesizing a lithium manganese oxide Patent #: 4980251
Issued on: 12/25/1990
Inventor: Thackeray, et al.

Inventors

Assignee

CSIR

Application

No. 558816 filed on 07/27/1990

US Classes:

429/333, And acyclic ether solvent423/599, Manganese (e.g., manganate, etc.)423/641, Alkali metal (Li, Na, K, Rb, or Cs)429/224, Manganese component is active material429/338, The hetero ring is a cyclic carbonate (e.g., ethylene carbonate, propylene carbonate, etc.)429/342Acyclic carbonate solvent

Examiners

Primary: Lewis, Michael
Assistant: DiMauro, Peter

Attorney, Agent or Firm

Richards, Medlock & Andrews

Foreign Patent References

009934 EP. 04/11/1980
0265950 EP. 05/11/1988
2221213A GB. 01/11/1990

International Classes

H01M 006/16
H01M 004/50
C01G 045/12

Foreign Application Priority Data

1989-07-28 ZA

Abstract

The invention provides a novel lithium manganese oxide compound in which oxygen anions, lithium cations and manganese cations are arranged in layers, each layer of lithium cations being sandwiched between two layers of oxygen anions, each layer of manganese cations being sandwiched between two layers of oxygen anions and each layer of oxygen anions being sandwiched between a layer of lithium cations and a layer of manganese cations. The invention also provides a method of making the compound; and an electrochemical cell employing the compound as its cathode.

Other References

Goodenough, "Manganese Oxides as Battery Cathodes", in Proc. of the Symposium on Manganese Dioxide Electrode Theory and Practice for Electrochemical Applications Electrochemical Society, Battery Division, Proceedings, vol. 85-4 (1986), pp. 77-96
Rossouw, M. H., et al. "Structural Aspects of Lithium-Manganese-Oxide Electrodes for Rechargeable Lithium Batteries", Materials Research Bulletin, vol. 25 (1990), pp. 173-182
DeKock, A. et al. "Defect Spinels in the System Lithium Oxide . y-Manganese Dioxide (y>2.5): A Neutron-Diffraction Study and Electrochemical Characterization of Li₂ Mn₄ O₉ ", Mat. Res. Bull, vol. 25, (1990), p. 657
M. Jansen, "On the Knowledge of the Sodium Chloride-Type Structure Family: New Investigations on Li₂ MnO₃ ", Zeitschrift fuer Anorg. Allgem. Chemie, vol. 397 (1973), pp. 279-289
J. C. Hunter. "Preparation of a New Crystal Form of Manganese Dioxide: λ-MnO₂ ", Chemical Abstracts, vol. 95, #160312t (1981)
Rossouw, M., et al. "Lithium Manganese Oxides from Li₂ MnO₃ for Rechargeable Lithium Battery Operations", Mat. Res. Bull., vol. 26, pp. 463-473 (1991)
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Wells, A. F., Structural Inorganic Chemistry, the passage "The γ-MO.OH Structure" at pp. 527-528
Nohma, T., et al. "Manganese Oxides for a Lithium Secondary Battery--Composite Dimensional Manganese Oxide (CDMO)", Journal of Power Sources, 26, 389-396 (1989)
Hunter, James C., "Preparation of a New Crystal Form of Manganese Dioxide: λ-MnO₂," Journal of Solid State Chemistry, 39, 142-147 (1981