High capacity lithium ion battery formation protocol and corresponding batteries
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United States of America Patent
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Oct 13, 2015
Grant Date -
Feb 21, 2013
app pub date -
Aug 17, 2012
filing date -
Aug 19, 2011
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Abstract
Battery formation protocols are used to perform initial charging of batteries with lithium rich high capacity positive electrode to result a more stable battery structure. The formation protocol generally comprises three steps, an initial charge step, a rest period under an open circuit and a subsequent charge step to a selected partial activation voltage. The subsequent or second charge voltage is selected to provide for a desired degree of partial activation of the positive electrode active material to achieve a desired specific capacity while providing for excellent stability with cycling. The formation protocol is particularly effective to stabilize cycling for compositions with moderate lithium enrichment.
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