Negative electrode for sodium molten salt battery, method for producing same, and sodium molten salt battery
An aspect of the present invention relates to a negative electrode for a sodium molten salt battery, the negative electrode including a negative electrode current collector and a negative electrode mixture layer arranged on a surface of the negative electrode current collector, the negative electrode mixture layer including negative electrode active material particles and a film arranged on a surface of each of the negative electrode active material particles, the negative electrode active material particles containing hard carbon, and the film containing a sodium-containing sulfide.
1. A negative electrode for a sodium molten salt battery, comprising:
a negative electrode current collector and a negative electrode mixture layer arranged on a surface of the negative electrode current collector,
the negative electrode mixture layer including negative electrode active material particles and a film arranged on a surface of each of the negative electrode active material particles,
the negative electrode active material particles containing hard carbon, and
the film containing sodium sulfide.
2. The negative electrode for a sodium molten salt battery according to claim 1 , wherein the film has an average thickness of 10 to 500 nm.
3. The negative electrode for a sodium molten salt battery according to claim 1 ,
wherein the hard carbon contains sulfur, and
the negative electrode mixture layer has a sulfur content of 0.05% by mass or more.
4. The negative electrode for a sodium molten salt battery according to claim 3 , wherein the hard carbon contains a mercapto group.
5. A sodium molten salt battery comprising:
a positive electrode, the negative electrode according to claim 1 , a separator arranged between the positive electrode and the negative electrode, and a molten salt electrolyte having sodium ion conductivity.