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US 2001/0041290 A1Published application
Lithium polymer secondary battery
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKenichi Morigaki, Toshihide Murata, Yasuyuki Shibano, Nobuo Eda
Life of this patent
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Abstract
To obtain highly reliable lithium polymer secondary batteries with charge/discharge cycle characteristics equivalent to those of lithium ion secondary batteries, 70 to 90% of the total void volume of an electrode group formed by laminating the positive electrode, negative electrode and separator is filled with a nonaqueous electrolyte.
Claims3
A lithium polymer secondary battery comprising:
- an electrode group formed by laminating a positive electrode made of a lithium-containing composite oxide, a negative electrode made of a material capable of reversibly absorbing and desorbing lithium, and a separator containing an inorganic or organic filler;
- and a polymer electrolyte made of a nonaqueous electrolyte and a polymer material contained in said positive electrode, negative electrode and separator;
- wherein 70 to 90% of a total void volume of said electrode group is filled with said nonaqueous electrolyte.
Dependencies are inferred from the claim text.