Porous Carbon/Se Composite Derived from Pistachio Shell as High-performance Li-Se Battery Cathode

Abstract

Pistachio shell derived porous carbon with large amount of micropores is fabricated via a straightforward chemical activation and used as a selenium host material for lithium-selenium batteries. The as-obtained Se/carbon cathode displays a first discharge capacity of 713.1 mAh g⁻¹ and displays a superior reversible capacity of 422.3 mAh g⁻¹ after 100th cycle at 0.2 C (1C = 675 mA g⁻¹). Furthermore, at a large rate of 10 C (6.75 A g⁻¹), it still displays a reversible capacity of 221.2 mAh g⁻¹. Such unique porous carbon as a selenium host material with superior electrochemical performances suggests great potential for the practical application of the Li-Se batteries.