Eveready Battery Company, Inc.

Lianying Zhang

Jai Prakash

Deepika B Singh

Thomas R DeMoully

Michael R Klein

Vince Puglisi

A metal hydride rechargeable cell is provided that discharges during a test discharge at a rate of 8 C to 18 C and a cell temperature of 0&deg; C. where the voltage remains above 0.2 volts during the half of the discharge curve. The cell comprises a negative electrode of hydrogen storage alloy material having a particle size volume distribution whose d(50) value does not exceed 2(2D,t),, where D,is the hydrogen diffusion coefficient for the alloy at 0&deg; C. and t is a time period from about 200 to about 450 seconds. A method of manufacturing the cell of the present invention involves an activation protocol comprising at least one formation cycle, a heat treating step, and a cycling step. This method avoids unnecessary processing of the metal alloy material prior to incorporation into the negative electrode.

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Gainesville, FL, United States of America

Lianying Zhang