| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte lithium-ion secondary batter which has a large capacity and a high output and which, even after charging and discharging are repeated at a high temperature environment such as around 60°C, can maintain an initial large capacity and can prevent a deterioration of the output at room temperature and at a low temperature for example at around -30°C and can demonstrate the initial high output. <P>SOLUTION: The nonaqueous electrolyte lithium-ion secondary battery 1 is provided at least with a positive electrode 2 containing a positive electrode active material, a negative electrode 3 containing a negative electrode active material made of a carbon group material, and a nonaqueous electrolyte solution made of an electrolyte of which the principal component is LiPF<SB>6</SB>solved in nonaqueous solvent. The positive electrode active material has a main component of iron phosphate lithium of an olivine structure. The nonaqueous solvent has a principal component of a mixed solvent of ethylene carbonate and diethyl carbonate, or a mixed solvent of ethylene carbonate and ethyl methyl carbonate, and moreover contains 0.2 wt.% to 5 wt.% of vinylene carbonate and/or vinylethylene carbonate. <P>COPYRIGHT: (C)2009,JPO&INPIT |
