Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1990-03-30
1992-01-28
Kalafut, Stephen J.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
429194, H01M 1040
Patent
active
050843664
ABSTRACT:
A non-aqueous electrolyte secondary cell comprises a negative electrode composed of at least one selected from the group consisting of lithium and lithium compounds, a non-aqueous electrolyte containing a lithium salt, and a positive electrode active material having a composition represented by the general formula, Li.sub.x M.sub.y Mn.sub.(2-y) O.sub.4, wherein M is at least one selected from the group consisting of Co, Cr, Fe and the like, 0.85.ltoreq.x<1.15, and 0.02.ltoreq.y.ltoreq.0.3. The positive electrode active material in a charged state has a composition represented by the general formula, Li.sub.x M.sub.y Mn.sub.2 (-y) O.sub.4, wherein x.ltoreq.0.7, owing to the extraction of lithium ions from the positive electrode active material on charging. The non-aqueous electrolyte secondary cell has an improved cycle life.
REFERENCES:
patent: 4507371 (1985-03-01), Thackeray et al.
patent: 4904552 (1990-02-01), Furukawa et al.
patent: 4956248 (1990-09-01), Furukawa et al.
Ohzuku, et al., "Electrochemical Behavior of Spinel-Related Manganese Dioxide in Lithium Nonaqueous Cell".
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Patent Abstracts of Japan, vol. 14, No. 380 (E-965) [4323], Aug. 16th; & JP-A-2 139 861 (Matsushita Electric Ind. Co., Ltd.) 29-05-1990.
Patent Abstracts of Japan, vol. 14, No. 229 (E-928) [4172] May 15th 1990; & JP-A-2 60 056 (Sanyo Electric Co., Ltd.) 28-02-1990.
Chemical Abstracts, vol. 113, No. 12, Sep. 17th 1990, p. 219, Abstract No. 1000927c, Columbus, Ohio, U.S.; and JP-A-02 65 061 (Sanyo Electric Co., Lts) 05-03-1990.
Patent Abstacts of Japan, vol. II, No. 83 (E-489) [2530], Mar. 13, 1987; & JP-A-61 239 563 (Matsushita Electric Ind,. Co., Ltd.) 24-10-1986.
Kalafut Stephen J.
Matsushita Electric - Industrial Co., Ltd.
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