Method for Charging Nonaqueous Electrolytic Secondary Cell and Nonaqueous Electrolytic Secondary Cell
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United States of America Patent
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Issued Date -
Jun 8, 2006
app pub date -
Nov 5, 2002
filing date -
Nov 5, 2002
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Abandoned
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Abstract
A charging method of a nonaqueous electrolyte secondary battery which comprises a positive electrode plate including a lithium-manganese composite oxide with spinel structure; a negative electrode plate including graphite capable of storing and discharging lithium; and nonaqueous electrolyte. When the ratio of a theoretical capacity of the negative electrode plate to a theoretical capacity of the positive electrode plate is set as RN/s and the graphite which has stored lithium by charging is represented by Li.sub.xC.sub.6, the nonaqueous electrolyte secondary battery is characteristically charged so that the maximum value Xmax X can have satisfies the following Conditions (1) and (2): Xmax.ltoreq.0.75 Condition (1) Xmax.ltoreq.-0.70R.sub.N/S+1.31 Condition (2) The life performance is remarkably improved by charging the nonaqueous electrolyte secondary battery while satisfying the Conditions.
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