| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure sufficient capacity of a nonaqueous electrolyte secondary battery by improving thermal stability of positive electrode material used for a positive electrode of the battery, and to obtain excellent thermal stability of the nonaqueous electrolyte secondary battery even in case that the battery is enlarged for charging and discharging with a high electric current. <P>SOLUTION: The non-aqueous electrolyte secondary battery has a positive electrode 1, a negative electrode 2, and non-aqueous electrolyte 4. The positive electrode 1 is made from a mixture of fluorine added lithium, nickel, cobalt, and manganese composite oxide that is represented by LiNi<SB>1-x-y</SB>Co<SB>x</SB>Mn<SB>y</SB>O<SB>2</SB>(wherein, x and y in the formula satisfy 0.5<x+y<1.0 and 0.1<y<0.6) and spinel structure lithium and manganese composite oxide that is represented by Li<SB>(1+a)</SB>Mn<SB>2-a-b</SB>M<SB>b</SB>O<SB>4</SB>(wherein, M in the formula is at least one or more kinds of elements selected from a group consisting of Al, Co, Ni, Mg and Fe, and (a) and (b) in the formula satisfy 0≤a≤0.2 and 0≤b≤0.1). <P>COPYRIGHT: (C)2005,JPO&NCIPI |
