Nonaqueous electrolyte secondary cell
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United States of America Patent
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Aug 17, 2004
Grant Date -
Jul 3, 2003
app pub date -
Oct 24, 2001
filing date -
Feb 24, 2000
priority date (Note) -
Expired
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Abstract
The non-aqueous electrolyte secondary battery of the present invention comprises, e.g., a positive electrode 6, a negative electrode 5, a polymer membrane 1 containing carbon powder or the like, and a separating membrane layer 7 for preventing shortcircuiting. A carbon powder, silicon powder, tin powder or aluminum powder 2 contained in the polymer membrane 1 containing carbon powder or the like absorbs as a lithium-absorbing material metallic lithium powders 3 or metallic lithium dendrite 4 which has been produced from the negative electrode 5 due to charge or discharge and takes no part in charge or discharge. This lithium-absorbing material is less reactive than the metallic lithium powders 3 or metallic lithium dendrite 4 and thus enhances the safety of the battery and controls shortcircuiting between the positive electrode and the negative electrode due to metallic lithium dendrite, making it possible to drastically improve charge and discharge cycle life performance.
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