Lithium phosphate composite positive electrode and non-aqueous electrolyte cell
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United States of America Patent
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-
Jun 8, 2004
Grant Date -
Jan 10, 2002
app pub date -
Apr 25, 2001
filing date -
Apr 25, 2000
priority date (Note) -
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Abstract
A lithium ion cell less costly than a control lithium ion cell is provided. The lithium ion cell is improved appreciably in operational stability under special conditions, such as high temperatures, and exhibits superior characteristics against over-discharging, while guaranteeing compatibility to the operating voltage of a conventional lithium ion cell and an energy density equivalent to that of the conventional lithium ion cell. To this end, the lithium ion cell includes a positive electrode, a negative electrode and a non-aqueous electrolyte, and uses, as a positive electrode active material, a composite material of a first lithium compound represented by the general formula Li.sub.x M.sub.y PO.sub.4, where 0
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