| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery having a large capacity and improved cycle characteristics as a positive electrode having improved electron conductivity without increasing the amount of added polyvinylidene fluoride (PVdF) as a binder even if ferric phosphate lithium (LiFePO<SB>4</SB>) is used as a positive electrode active material. <P>SOLUTION: The nonaqueous electrolyte battery comprises the positive electrode 11 containing ferric phosphate lithium (LiFePO<SB>4</SB>) as a positive electrode active material; a negative electrode 12; and a nonaqueous electrolyte 15. Then, in the positive electrode 11, a positive electrode mixture layer comprising the positive electrode active substance, a conduction agent, and a binder is formed on a positive electrode collector, and the binder has a mass average molecular weight of 370,000 or higher and contains a polyvinylidene fluoride (PVdF) of 100,0000 or smaller. The amount of addition of PVdF is preferably 1 percentage by mass or higher and 10 percentages by mass or smaller to the entire mass of the positive electrode mixture layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
