Structure-controlled SnSe2 nanosheets as high performance anode material for lithium ion batteries

SnSe 2 is regarded as one of the promising anode materials for the advanced lithium ion batteries (LIBs) due to its high theoretical capacity and good conductivity. In this work, SnSe 2 with controllable structure is synthesized by a facile solvothermal method and the influence of reductant on the morphology is revealed. It is found that interconnected SnSe 2 nanosheet assembled by ultrafine nanoparticles exhibits excellent electrochemical performance. As LIBs anode material, the SnSe 2 nanosheet delivers a high initial reversible capacity of 932 mAh g −1 with the coulombic efficiency of 75.2% at 200 mA g −1 , remaining at 334 mAh g −1 over 200 cycles. This highly reversible capacity and cycling stability are mainly ascribed to its special interconnected thin nanosheets structure, which could provide a three-dimensional network paths for ultrafast charge transfer.