| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminium foil for a lithium ion secondary battery positive electrode collector configured to limit the amount of residual rolling oil on the aluminium foil that causes performance deterioration of the lithium ion secondary battery.SOLUTION: A roller heated to 100-200°C with respect to a rolled aluminium foil is brought into contact with the front surface and rear surface of the aluminium foil, followed by degreasing process. Alternatively, an aluminium foil in a coil state is subjected to heat treatment at 100-160°C for 50 hours or more in a hydrogen-substituted sealed environment. The aluminium foil is appropriately degreased by these low temperature heat treatments. Consequently, the amount of residual oil is 4 mg/mor less, thereby preventing performance deterioration of the lithium ion secondary battery. |
