SODIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE ACTIVE MATERIAL POWDER, SLURRY COMPOSITION FOR SODIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE, NEGATIVE ELECTRODE FOR SODIUM ION SECONDARY BATTERY, AND SODIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode including titanium oxide, achieving higher capacity.SOLUTION: Sodium ion secondary battery negative electrode active material powder including titanium oxide having an amorphous phase is used. The titanium oxide having an amorphous phase absorbs and desorbs sodium ions. Sodium may be preliminarily incorporated in the titanium oxide having an amorphous phase.SELECTED DRAWING: Figure 1