A high capacity, high charge rate lithium secondary cell includes a high
capacity lithium-containing positive electrode in electronic contact with
a positive electrode current collector, said current collector in
electrical connection with an external circuit, a high capacity negative
electrode in electronic contact with a negative electrode current
collector, said current collector in electrical connection with an
external circuit, a separator positioned between and in ionic contact
with the cathode and the anode, and an electrolyte in ionic contact with
the positive and negative electrodes, wherein the total area specific
impedance for the cell and the relative area specific impedances for the
positive and negative electrodes are such that, during charging at
greater than or equal to 4C, the negative electrode potential is above
the potential of metallic lithium. The current capacity per unit area of
the positive and negative electrodes each are at least 3 mA-h/cm.sup.2,
the total area specific impedance for the cell is less than about 20
.OMEGA.-cm.sup.2, and the positive electrode has an area specific
impedance r.sub.1 and the negative electrode has an area specific
impedance r.sub.2, and wherein the ratio of r.sub.1 to r.sub.2 is at
least about 10.