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US 5,514,488 AGranted
Electrochemical secondary cell
AssigneeVarta Batterie Aktiengesellschaft
InventorsMartin G. Hake, Peter Kramer, Frank Mengel
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AssigneeVarta Batterie Aktiengesellschaft
InventorsMartin G. Hake, Peter Kramer, Frank Mengel
Estimating the term…
An Li/LiMn.sub.2 O.sub.4 secondary cell employing a SWING system (i.e., of the "rocking chair cell" type) includes a positive electrode formed as a metal gauze-reinforced, rolled electrode, and a negative electrode formed by impregnating a nickel foam with a paste of Li-intercalating graphite. Such electrodes are from 3 to 4 times thicker than the thin-film electrodes fabricated with prior, knife-coating techniques and employed in wound cells, and are therefore particularly suitable for constructing prismatic cells. By prerolling the as yet empty nickel foam to specific thicknesses, the capacity per unit area of the negative electrode can be tailored to that of the positive, rolled electrode. By rerolling the impregnated nickel foam, optimal energy density and electrode capacity is achieved, at a porosity of from 50 to 60%.
An electrochemical secondary cell having at least one positive electrode with an active material comprised of a lithium-intercalating chalcogen compound of a transition metal, at least one negative electrode with an active material comprised of a lithium-intercalating carbon product, and a non-aqueous electrolyte in a sealed container, wherein the positive electrode is a reticulated support matrix which is calender-coated with a plastic-bound lithium manganese spinel, LiMn.sub.2 O.sub.4, and wherein the negative electrode is a porous metal foam support matrix which is impregnated with a graphite paste.
An electrochemical secondary cell having at least one positive electrode with an active material comprised of a lithium-intercalating chalcogen compound of a transitional metal, at least one negative electrode with an active material comprised of a lithium-intercalating carbon product, and a non-aqueous electrolyte in a sealed container, wherein the positive electrode is a reticulated support matrix which is calender-coated with a plastic-bound lithium manganese spinel, LiMn.sub.2 O.sub.4, and wherein the negative electrode is a porous metal foam support matrix having a thickness between 700 and 1100 .mu.m which is impregnated with a graphite paste.
Dependencies are inferred from the claim text.