Properties of CoS2/CNT as a Cathode Material of Rechargeable Aluminum-Ion Batteries

Abstract

Aluminum ion batteries (AIBs) are considered, in principle, promising post-lithium-ion batteries, which are potential for using in grid-scale energy storage and electric vehicles, owing to the economic Al. The inflammable ionic liquid electrolyte endows stable plating and stripping of Al ions. A spotlighted research on cathode material has been preforming to obtain a high-performance cathode material that can match well with the prominent Al foil. However, one over-looked factor for the study of cathode materials is the cost and possibility of mass-production. With this key point in mind, we as the forerunner studied the CoS2/carbon nanotubes (CNTs) composite cathode material composed of low cost and commercialized CoS2 and multi-wall CNTs to promote the development of AIBs. Stable charge/discharge plateaus (at 1.2/0.9 V vs. AlCl4-/Al) during cycling test were obtained for the CoS2/CNTs product at a high current density of 1000 mA g(-1), with an extremely high Coulombic efficiency of 98% and reasonable electrochemical capacities. This report is expected to contribute more contribution in the development of cathode materials for rechargeable AIBs.