| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative electrode binder for a lithium ion secondary battery, minimizing the volume expansion of a negative electrode active material layer accompanying the insertion and desorption of lithium, thereby achieving excellent cycle characteristics.SOLUTION: A binder for a lithium ion secondary battery contains polyamide-imide having repeating units, one of which is represented by the following formula including a trifluoromethyl group (-CF3 group) and the other of which has a structure not including a trifluoromethyl group. |
