Cu2Se with facile synthesis as a cathode material for rechargeable sodium batteries

Abstract

A Cu₂Se electrode on a copper grid substrate has been directly fabricated by a facile post-selenized method and tested as a positive material for sodium ion batteries. Cu₂Se exhibits large reversible capacities (about 250 mA h g⁻¹), good cyclic stabilities and low polarization. These results indicate that Cu₂Se is a promising candidate as a cathode material for sodium ion batteries.