| 摘要 |
PROBLEM TO BE SOLVED: To increase capacity and cycle stability of capacity and to use A1 for a collector of a positive electrode, by using a negative electrode containing mainly a carbon material capable of storing Li-ions, a positive electrode containing mainly a Li-containing transition metal chalcogenide compound, and a predetermined compound contained as an electrolyte. SOLUTION: A Li-ion secondary battery is composed of a negative electrode 2 containing mainly a carbon material capable of storing Li-ions, a positive electrode 1 containing mainly a Li-containing transition metal chalcogenide compound, and an electrolyte solution containing, as an electrolyte, a Li bis-(fluoroalkylsulfonyl) imide having alkyl group of which the carbon number is two or more. The carbon material constituting the negative electrode is not limited in particular so far as it is capable of storing Li-ions. For example, graphite, activated carbon, or the like is used. For a collector, foil of metal such as Cu, Ni and the like is mentioned, and Cu is preferable from an aspect of electroconductivity. As a binder, a homopolymer or a copolymer, or the like of tetrafluoroethylene or trifluoroethylene is used. |
