NEGATIVE ELECTRODE MATERIAL FOR BATTERY, NEGATIVE ELECTRODE PRECURSOR MATERIAL FOR BATTERY, AND BATTERY

摘要

In a molten salt battery 1, a positive electrode 2 including an active material film 22 arranged on an Al collector 21, a separator 3 formed of a glass cloth impregnated with a molten salt serving as an electrolyte, and a negative electrode 4 including an active material film 43 and a Zn film 42 arranged on an Al collector 41 are accommodated in an Al case 5 having a substantially rectangular parallelepiped shape. The active material film 43 contains an active material composed of a Sn-Na alloy. The active material film 22 and the active material film 43 occlude and emit Na ions of the molten salt. Thereby, provided are a negative electrode material for a battery, the negative electrode material having higher hardness on a surface side (active material side) than a Na negative electrode during the operation of the battery, suppressing the formation of Na dendrites, and having a higher capacity; a negative electrode precursor material for the battery; and a battery including a negative electrode composed of the negative electrode material for a battery.