MOF-derived carbon-encapsulated cobalt sulfides orostachys-like micro/nano-structures as advanced anode material for lithium ion batteries

Carbon-encapsulated transitional metal sulfides are considered as a promising anode material candidate for lithium ion batteries. Herein, a simple process is developed to synthesize 3D orostachys-like cobalt sulfides/C composites. This process is associated with the rational design of metal organic frameworks (MOFs) and subsequent in-situ sulfurization. Benefit from its unique structures, this novel 3D orostachys-like cobalt sulfides@C composites delivers an excellent charge capacity of 791 mAh g(-1) after 100 cycles at 0.2 A g(-1) as well as high stability of 667 mA g(-1) after 700 cycles at 1 A g(-1). Pseudocapacitive behaviors enhanced the electrochemical performance of 3D orostachys-like cobalt sulfides@C composites. (C) 2018 Elsevier Ltd. All rights reserved.