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

Abstract

SnSe2 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, SnSe2 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 SnSe2 nanosheet assembled by ultrafine nanoparticles exhibits excellent electrochemical performance. As LIBs anode material, the SnSe2 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.