ANODE ACTIVE MATERIAL FOR SODIUM BATTERY, ANODE, AND SODIUM BATTERY

摘要

In the present invention, in order to increase the cycling characteristics of a sodium battery, sodium titanate is used as the anode active material for the sodium battery. For example, the anode active material is preferably the sodium titanate represented by compositional formula (1) or compositional formula (2): compositional formula (1) being Na2+XTi3O7 (0 <= X <= 0.9); and compositional formula (2) being Na4+XTi5O12 (0 <= X <= 1.0). Furthermore, by reducing the amount of water in the battery and by optimizing the particle size of the active material, the sodium titanate can even be represented by the following compositional formulae: compositional formula (1') being Na2+XTi3O7 (0 <= X <= 2.0); and compositional formula (2') being Na4+XTi5O12 (0 <= X <= 2.0).