RECHARGEABLE BATTERY CELL WITH IMPROVED HIGH TEMPERATURE PERFORMANCE

摘要

An alkaline, rechargeable electrochemical cell includes a pasted electrode structure in which a composition comprising a paste matrix component includes cobalt in an amount greater than 6 weight percent ranging up to 14 weight percent. The matrix may also include a rare earth such as yttrium. The composition further includes particles of nickel hydroxide dispersed in the matrix, and these particles include cobalt levels ranging from greater than 8 atomic percent up to 15 atomic percent. Cells incorporating these materials have good charging efficiency at elevated temperatures.

主权项

1. A positive electrode composition for use in an alkaline, rechargeable electrochemical cell, said composition comprising:
a matrix material comprising a mixture of nickel hydroxide and a cobalt material comprising cobalt metal and/or a cobalt oxide, and/or cobalt hydroxide, wherein the weight percent of cobalt in said mixture relative to the nickel component thereof is greater than 6% and less than or equal to 14%; and particles of nickel hydroxide dispersed in said matrix, said nickel hydroxide particles including cobalt, the atomic percent of said cobalt being greater than 8% and less than or equal to 15%.