Patent ID: 7201994

Claim:
A non-aqueous electrolyte secondary battery comprising: a positive electrode comprising a positive electrode current collector and a positive electrode material mixture layer formed thereon; a negative electrode comprising a negative electrode current collector and a negative electrode material mixture layer formed thereon; and a non-aqueous electrolyte, characterized in that (1) at least one of said positive and negative electrodes has a positive temperature coefficient of resistance, (2) said non-aqueous electrolyte contains an additive which is stable at the normal operating voltage range of said battery and is able to polymerize at the voltage exceeding the maximum value of said operating voltage range, wherein said additive is at least one selected from the group consisting of biphenyl, 3-chlorothiophene, furan, o-terphenyl, m-terphenyl, p-terphenyl, diphenyl ether, 2,3-benzofuran, bis(p-tolyl)ether, diallyl ether, allyl butyl ether, 3-phenoxy toluene and cyclohexyl benzene, (3) a resistivity at 120° C. of at least one of said positive and negative electrodes is 10 7 Ω·cm or more, and (4) a resistance layer having a positive temperature coefficient of resistance is formed on a surface of at least one of said positive electrode current collector and said negative electrode current collector.