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US 7,682,748 B2Granted
Nonaqueous electrolyte secondary battery
AssigneeSanyo Electric Co., Ltd.
InventorsMasanobu Takeuchi, Hiroyuki Fujimoto, Seiji Yoshimura, Shin Fujitani
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Abstract
In a nonaqueous electrolyte secondary battery having a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte, as the positive electrode active material or as the negative electrode active material, a mixture containing molybdenum dioxide and lithium titanate in a weight ratio (molybdenum dioxide:lithium titanate) of 90:10 to 50:50 is used.
Claims5
A nonaqueous electrolyte secondary battery comprising;
- a positive electrode containing a positive electrode active material;
- a negative electrode containing a negative electrode active material;
- and a nonaqueous electrolyte,
- wherein:
- (1) lithium cobaltate is used as the positive electrode active material and a mixture containing molybdenum dioxide and lithium titanate in a weight ratio (molybdenum dioxide:lithium titanate) of 90:10 to 50:50 is used as the negative electrode active material;
- (2) when weight of lithium cobaltate used as the positive electrode active material is denoted by WLCO, weight of molybdenum dioxide used as the negative electrode active material by WMoO2, and weight of lithium titanate used as the negative electrode active material by WLTO, 100≦(175×WLTO+210×WMoO2)/WLCO≦165 is satisfied;
- and
- (3) the nonaqueous electrolyte comprises a solvent and 5-30% by volume of ethylene carbonate is contained in the solvent.
5 more elements
A nonaqueous electrolyte secondary battery comprising;
- a positive electrode containing a positive electrode active material;
- a negative electrode containing a negative electrode active material;
- and a nonaqueous electrolyte,
- wherein:
- (1) lithium cobaltate is used as the positive electrode active material and a mixture containing molybdenum dioxide and lithium titanate in a weight ratio (molybdenum dioxide:lithium titanate) of 90:10 to 50:50 is used as the negative electrode active material;
- (2) in the negative electrode, as a conductive agent, graphitized vapor-grown carbon fiber having lattice constant C0 in the range of 6.7 Å≦C0≦6.8 Å, a ratio La/Lc of crystallite dimensions (La and Lc) in a base surface (surface a) and in a lamination direction (surface c) in the range of 4≦La/Lc≦6 is used;
- and
- (3) when weight of lithium cobaltate used as the positive electrode active material is denoted by WLCO, weight of molybdenum dioxide used as the negative electrode active material by MoO2, and weight of lithium titanate used as the negative electrode active material by WLTO, 100≦(175×WLTO+210×WMoO2)/WLCO≦165 is satisfied.
5 more elements
Dependencies are inferred from the claim text.