Phosphate additives for nonaqueous electrolyte rechargeable electrochemical cells
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United States of America Patent
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Jul 19, 2005
Grant Date -
Jun 19, 2003
app pub date -
Sep 20, 2002
filing date -
Oct 22, 1998
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Abstract
A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one phosphate additive having the formula: (R1O)P(═O) (OR2) (OR3) and wherein R1, R2 and R3 are the same or different, wherein at least one, but not all three, of the R groups is hydrogen, or at least one of the R groups has at least 3 carbon atoms and contains an sp or sp2 hybridized carbon atom bonded to an sp3 hybridized carbon atom bonded to the oxygen atom bonded to the phosphorous atom.
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