NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY
An object of the invention is to provide an inexpensive non-aqueous electrolyte secondary battery that allows reversible charge and discharge to be carried out. The non-aqueous electrolyte secondary battery according to the invention includes a positive electrode, a negative electrode containing carbon capable of storing and releasing potassium, and a non-aqueous electrolyte including potassium ions.
1 . A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode including carbon capable of storing and releasing potassium, and a non-aqueous electrolyte including potassium ions.
2 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein said negative electrode includes a collector including a metal foil, and
said carbon is applied on said collector.
3 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein said carbon includes graphite.
4 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein said non-aqueous electrolyte includes potassium hexafluorophosphate.
5 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein said non-aqueous electrolyte includes one or more selected from the group consisting of a cyclic carbonate, a chain carbonate, esters, cyclic ethers, chain ethers, nitriles, and amides.