| 摘要 |
PROBLEM TO BE SOLVED: To make a current cut-off mechanism sufficently function in overcharging in a nonaqueous electrolyte secondary battery. SOLUTION: A positive electrode contains one type or more of aromatic hydrocarbon in the range of 5 to 10wt.% selected from naphthalene, anthracene and phenanthrene. In overcharging, aromatic hydrocarbon contained in the positive electrode is polymerized and covers the whole front surfaces of particles of lithium composite oxide as a positive electrode active material. As a result, internal pressure of a battery is raised under the relative slow condition, and cut-off of current is reliably performed by a current cut-off mechanism. Moreover, the capacity of discharge is hardly decreased. |
