In situ formation of carbon encapsulated nanosheet-assembled MoSe2 hollow nanospheres with boosting lithium storage

Abstract

Carbon encapsulated nanosheet-assembled MoSe2 hollow nanospheres were in situ fabricated via a facile hydrothermal treatment and subsequent annealing treatment. When evaluated as anode material for lithium-ion batteries, the MoSe2/C hybrid hollow spheres manifest prodigious cycling stability (a high reversible capacity of 795mAhg−1 after 250 cycles at 0.2Ag−1 and 744mAhg−1 after 300 cycles at 1Ag−1) and compelling rate capability (370mAhg−1 even at a high current density of 10Ag−1) compared to the bare MoSe2 hollow nanospheres. The impressive lithium storage properties of the as-prepared MoSe2/C nanocomposites can be attributed to the introduction of glucose-derived conductive carbon and the design of hollow structure, which facilitates fast electron and ion transfer, relieves the stress caused by volume variation upon cycling and improves the electric conductivity. Such remarkable electrochemical performances together with universal approach endow this material with potential application for next generation lithium-ion batteries.