Preparation and electrochemical Na-storage property of SnSe2 nanosheets

Abstract SnSe2 nanosheets, composed by small nanoparticles, have been synthesized via a solvothermal method with different times and temperatures. SnSe2 prepared at 180 °C for 25 h, exhibits small size of nanoparticles (5 nm), thin thickness of nanosheets (97 nm) and large surface area (6.32 m2 g−1), revealing good electrochemical performance. It achieves an initial charge capacity of 484 mAh g−1 at 0.1 A g−1, a high initial Coulombic efficiency of 82%, and a stable charge capacity of 361 mAh g−1 even after 200 cycles at 1 A g−1.