Even better, copper sulfide, composed of abundant natural materials such as copper and sulfur, has better cost competitiveness than lithium ion batteries, which use lithium and cobalt.

"Sodium ion batteries using copper sulfide developed." ScienceDaily. ScienceDaily, 17 April 2018. <www.sciencedaily.com / releases / 2018 / 04 / 180417115734.htm>.

Further analysis by the team revealed that copper sulfide undergoes crystallographic tuning to make a room for sodium insertion. Results indicate that the sodium ion-insertion capacity of copper ...