Aqueous secondary battery

摘要

An aqueous secondary battery 10 according to the present invention includes a positive electrode containing a NASICON-type positive-electrode active material that can insert and extract sodium as a positive-electrode active material 12, a negative electrode containing a negative-electrode active material 17 that can insert and extract sodium, and an electrolyte solution 20 disposed between the positive electrode and the negative electrode, the electrolyte solution 20 being an aqueous solution in which sodium is dissolved. The NASICON-type positive-electrode active material is, for example, Na3V2(PO4)3, and the electrolyte solution 20 is an aqueous solution in which sodium is dissolved. The negative-electrode active material 17 is preferably a NASICON-type negative-electrode active material (for example, LiTi2(PO4)3 or NaTi2(PO4)3).

主权项

1. An aqueous secondary battery in which sodium is dissolved, comprising:
a positive electrode including a positive-electrode active material that can insert and extract sodium; a negative electrode including a negative-electrode active material that can insert and extract sodium; and an electrolyte solution disposed between the positive electrode and the negative electrode, the electrolyte solution being an aqueous solution in which sodium is dissolved, wherein the negative electrode includes a NASICON negative electrode active material that can insert and extract sodium, and the NASICON negative electrode active material has a general formula of EbL2(RO4)3, wherein E denotes at least one of alkali metals and alkaline-earth metals, L denotes a transition metal, R denotes at least one of S, P, As, Mo, Si and W, and b ranges from 1 to 3.