| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery restrained from swelling when stored in a charged state and in a high-temperature environment. <P>SOLUTION: This nonaqueous electrolyte secondary battery is equipped with: a positive electrode 3 containing a positive electrode active material; a negative electrode 4; and a nonaqueous electrolyte. The nonaqueous electrolyte secondary battery is characterized by that the positive electrode active material contains lithium composite oxide powder wherein the particle diameter (D10) at a volume cumulative frequency of 10% is below 4.5 μm, the ratio (I<SB>003</SB>/I<SB>104</SB>) of the peak intensity I<SB>003</SB>of the (003) surface to the peak intensity I<SB>104</SB>of the (104) surface in a powder X-ray diffraction is larger than 5, and the mol ratio (X<SB>Li</SB>/X<SB>Co</SB>) of Li to Co is above 1.02; and the nonaqueous electrolyte contains a sultone compound having at least one double bond in each ring. <P>COPYRIGHT: (C)2004,JPO |
