| abstract |
A negative electrode active material for a lithium ion secondary battery containing a metal that can be alloyed with lithium, the following formula (1): [Chemical 1] (Wherein R 1 and R 2 each independently represent an alkoxy group, R 3 and R 4 each independently represent an alkyl group or a hydrogen atom, n and m each independently represent 0, 1 or 2, X represents a divalent group containing an oxyalkylene group in the main chain.) It is surface-treated with a silane compound represented by |