SODIUM MOLTEN SALT BATTERY

• Main Authors: FUKUNAGA ATSUSHI, ITANI EIKO, NUMATA KOMA, SAKAI SHOICHIRO, NITTA KOJI
• Format: Patent
• Language: English; Japanese
• Published: 05.02.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a sodium molten salt battery high in battery capacity and excellent in cycle characteristics.SOLUTION: A sodium molten salt battery includes: a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material; a separator interposed between the positive electrode and the negative electrode; and a molten salt electrolyte having sodium ion conductivity. The positive electrode active material includes a sodium-containing transition metal oxide, and the negative electrode active material includes hard carbon. A ratio: C/Cof a reversible capacitance Cof the negative electrode to a reversible capacitance Cof the positive electrode is in the range of 0.86-1.2. 【課題】電池容量が高く、サイクル特性に優れるナトリウム溶融塩電池を提供する。【解決手段】ナトリウム溶融塩電池は、正極活物質を含む正極と、負極活物質を含む負極と、前記正極および前記負極の間に介在するセパレータと、ナトリウムイオン伝導性を有する溶融塩電解質とを含み、前記正極活物質はナトリウム含有遷移金属酸化物を含み、前記負極活物質はハードカーボンを含み、前記正極の可逆容量Ｃｐに対する前記負極の可逆容量Ｃｎの比：Ｃｎ／Ｃｐは、０．８６〜１．２である。【選択図】図１