SODIUM SECONDARY BATTERY

摘要

The present invention relates to a sodium secondary battery comprising a positive electrode which includes a positive electrode current collector and a positive electrode material, the positive electrode material being carried on the positive electrode current collector, wherein the positive electrode material comprises a positive electrode active material reversibly containing sodium cation; a negative electrode which includes a negative electrode current collector and a negative electrode material, the negative electrode material being carried on the negative electrode current collector, wherein the negative electrode material comprises a negative electrode active material reversibly containing sodium cation; an electrolyte interposed at least between the positive electrode and the negative electrode; and a separator for retaining the electrolyte and separating the positive electrode and the negative electrode from each other; wherein the negative electrode active material is amorphous carbon, and the electrolyte is a molten salt electrolyte which is a mixture of a salt composed of sodium cation and an anion and a salt composed of an organic cation and an anion.

主权项

1. A sodium secondary battery comprising:
a positive electrode which includes a positive electrode current collector and a positive electrode material, the positive electrode material being carried on the positive electrode current collector, wherein the positive electrode material comprises a positive electrode active material reversibly containing sodium cation; a negative electrode which includes a negative electrode current collector and a negative electrode material, the negative electrode material being carried on the negative electrode current collector, wherein the negative electrode material comprises a negative electrode active material reversibly containing sodium cation; an electrolyte interposed at least between the positive electrode and the negative electrode; and a separator for retaining the electrolyte and separating the positive electrode and the negative electrode from each other, wherein the negative electrode active material is amorphous carbon, the negative electrode active material further comprises a binder which does not contain halogen atoms, the electrolyte is a molten salt electrolyte which is a mixture of a salt composed of sodium cation and an anion and a salt composed of an organic cation and an anion, the content percentage of a metal cation other than the sodium cation in all the cations in the molten salt electrolyte is not more than 5% by mol.