Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1994-02-02
1996-08-27
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 30, H01M 1044
Patent
active
055504540
ABSTRACT:
A method for extending the cycle life of a solid, secondary lithium electrochemical cell is disclosed. The method increases the ability of an electrochemical cell to retain at least one-half of its initial charge capacity over many charge-discharge cycles. This objective is achieved by the use of certain non-uniform charging currents. In one aspect, the method relates to rapidly charging a discharged solid lithium secondary cell or battery, that has an active surface area S and that had an initial charge capacity Q.sub.0 and cycle life .eta..sub.0 prior to being discharged wherein Q.sub.0 was established by applying a constant current I.sub.0 over a length of time T.sub.0 such that Q.sub.0 =SI.sub.0 T.sub.0, which comprises the step of applying several charging currents, I.sub.k, to the cell or battery wherein each I.sub.k is applied for a time period, T.sub.k <T.sub.0, such that ##EQU1## where k is an integer from 1 to m representing the time serial order of charging steps in one charging one-half cycle, and m is an integer greater than one representing the charging steps in one charging one-half cycle.
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Tso Edward
Wong Peter S.
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