| abstract |
[PROBLEMS] To provide a lithium ion secondary battery having a high capacity and excellent charge / discharge cycle characteristics at a relatively large current. SOLUTION: A positive electrode containing niobium pentoxide, a conductive material and a binder, a negative electrode containing a carbonaceous material capable of electrochemically inserting and removing lithium and a binder, and a non-aqueous electrolyte are provided. The conductive material of the positive electrode is composed of a mixture of a specific carbon black and a specific graphite powder, and the binder of the negative electrode is a specific rubber-based polymer, a specific cellulose compound, or a specific polymer. It is characterized by comprising a mixture with an acrylic acid compound. |