CYLINDRICAL NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PURPOSE:To provide a lithium secondary battery having an extended charge- discharge cycle life by suppressing concentrated generation of dendrite on the peripheral part in a negative pole-like shape. CONSTITUTION:In a nonaqueous electrolyte secondary battery consisting of a group of pole plates and a nonaqueous electrolyte sealed in a container wherein the group of the pole plates consist of a negative pole 3 using metal lithium as its active substance and a positive pole. 1 and they are rolled spirally while having a separator 2 interposed between them, the width of the positive pole 1 is made wider than that of the negative pole 3 and an electrically insulating material 4 insoluble in the electrolyte is applied to the peripheral part of the positive pole electrode surface where the positive pole 1 can not face to the negative pole 3, so that concentrated generation of dendrite in the peripheral part of the negative pole is suppressed. Thus dendrite generation along the anode periphery is suppressed, and a lithium secondary battery having a long charge-discharge cycle life can be obtained.