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US 5,169,736 AGranted
Electrochemical secondary element
AssigneeVarta Batterie Aktiengesellschaft
InventorsRainer Bittihn, Detley Hoge, Rudolf Herr
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AssigneeVarta Batterie Aktiengesellschaft
InventorsRainer Bittihn, Detley Hoge, Rudolf Herr
Estimating the term…
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.
An electrochemical secondary element having a positive electrode, a negative electrode, and a non-aqueous electrolyte, which element comprises an electrode material which forms an open grid or skeleton host structure acting as a recipient substance for alternatively taking up and releasing electrochemically active cations during charging and discharging, the recipient substance of the positive electrode being an oxidic material of spinel structure whose composition conforms to the general formula M.sub.x Mn.sub.y O.sub.z, in which
An electrochemical secondary element having a positive electrode, a negative lithium-intercalating carbon electrode, and a non-aqueous electrolyte, which element comprises an electrode material which forms an open grid or skeleton hose structure acting as a recipient substance for alternatingly taking up and releasing electrochemically active cations during charging and discharging, the recipient substance of the positive electrode being an oxidic material of spinel structure whose composition conforms to the general formula M.sub.x Mn.sub.y O.sub.z, in which
Dependencies are inferred from the claim text.