Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Patent
1991-07-09
1992-12-08
Chaudhuri, Olik
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
429197, 429198, 429217, 429223, H01M 614, H01M 458
Patent
active
051697360
ABSTRACT:
An electrochemical secondary element with a non-aqueous electrolyte, whose charge/discharge mechanism is predicated upon the reversible intercalation of active Li+ ions in electrode materials having an open skeletal structure. The positive electrode is essentially a lithium-manganese spinel of the type Li.sub.q M.sub.x Mn.sub.y O.sub.z which, in addition to satisfying the expressions 0<x<0.6 and 1.4<y<2.0, can also contain up to 30% of other metals such as Co, in addition to Mn. The negative electrode is based on a carbon product obtained by pyrolysis from organic compounds, and serves as the recipient substance for the Li+ ions. By limiting the Li concentration in the spinel lattice to a range in which the numerical values of the variable q lie between 0 and 1.3, a lithium-poor manganese spinel is obtained. During discharging of the preponderant portion of the secondary element's capacity, the result is that a cell potential greater than 3 volt is obtained, and high cycling stability is also manifested.
REFERENCES:
patent: 4132619 (1979-01-01), Klein et al.
patent: 4507371 (1985-03-01), Thackeray et al.
patent: 4956247 (1990-09-01), Mizazaki et al.
patent: 4975346 (1990-12-01), Lecerf et al.
Bittihn Rainer
Herr Rudolf
Hoge Detley
Chaudhuri Olik
Nuzzolillo M.
Varta Batterie Aktiengesellschaft
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