SEPARATOR FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

The invention relates to a separator for use in a nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery employing the separator, the separator comprising a positive electrode and a negative electrode which are capable of occluding and releasing lithium, a separator, and a nonaqueous electrolytic solution comprising a nonaqueous solvent and an electrolyte, the separator for use in the battery having an electroconductive layer, the electroconductive layer having (1) an apparent volume resistivity of 1×10 4 ©·cm to 1×10 6 ©·cm, or (2) a volume resistivity of 1×10 -6 ©·cm to 1×10 6 ©·cm, or (3) a surface electrical resistance of 1×10 -2 © to 1×10 9 ©, and the electroconductive layer having a film thickness less than 5 µm. The invention further relates to.