| http://www.w3.org/ns/prov#value | - ode and a negative electrode both capable of occluding and releasing lithium ions, and a lithium ion conductive material, the lithium ion conductive material containing a compound of the following formula (1): [0047] wherein n is an integer of 0 or 1, R1, R2, R3 and R4 each are hydrogen or an alkyl group of 1 to 5 carbon atoms, wherein either one of the following requirements (a), (b) and (c) is m
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