Cobalt sulphide/graphene aerogel nanocomposite with enhanced anode performance for lithium energy storage

Cobalt sulphide/graphene aerogel nanocomposite (CGA) is successfully fabricated via a one-pot hydrothermal approach aided with ethylenediamine. CoS nanoparticles constructed by nanoplates are uniformly anchored and well distributed on the loose graphene aerogel framework. Owing to a synergistic effect combining nanosized CoS with graphene aerogel advantages, CGA as an anode material for lithium energy storage exhibits high reversible capacity, superior long-cycle property and excellent high-rate capability. Prominently, CGA maintains a high capacity approaching ~1100 mAh g−1 after 200 cycles at 100 mA g−1. Even at 1 A g−1, CGA still delivers a capacity of 460 mAh g−1. This approach can be readily applicable to prepare other graphene aerogel-based nanocomposites as anode materials.