| 摘要 |
PROBLEM TO BE SOLVED: To suppress temperature rise in a battery in an emergency and to increase the safety of the battery by containing boron nitride and/or aluminum nitride in a separator. SOLUTION: The electrode elements of a nonaqueous electrolyte secondary battery 1 are constituted of a positive electrode 6, a separator 7, and a negative electrode 8. Each of the positive electrode 6 and the negative electrode 8 of this battery 1 has a metal current collector at the center and functions as an electrode superior in electron conductivity and thermal conductivity. The separator 7 is made entirely of an electron nonconductive material and contains boron nitride BN and/or aluminum nitride AlN which are superior in heat resistance, thus its shape will not change at a high temperature and prevents an inter- electrode short circuit. In case the separator 7 is heated abnormally locally by an overcharge or an internal short circuit, it quickly dissipates heat and can prevent the chain of a destructive chemical reaction because it contains BN/AlN which is superior in thermal conductivity. |
