Sandwiched Bi2Se3@C nanocomposite designed by solid-state strategy with high lithium storage capacity

The Bi 2 Se 3 electrode material with dual storage mechanism has great potential to promote the development of high-capacity lithium-ion batteries. However, the serve selenium loss, large volume expansion and poor conductivity of Bi 2 Se 3 greatly hinder its practical application. To circumvent these issues, a unique Bi 2 Se 3 @C layered nanomaterial with sandwich like architecture was prepared by in situ selenization of precursor that originated from low-temperature solid-state chemical reaction, which provides superior lithium-ion storage capacity due to the advantages of increased interlayer spacing and abundant active sites, as well as the carbon-coated Bi 2 Se 3 nanoparticles inhibit self-aggregation and buffer the expansion of volume. The Bi 2 Se 3 @C-5/1 presents an exceptional capacity of 561.4 mA h g −1 (500 mA g −1 , 300 cycles) and 476 mA h g −1 (3 A g −1 , 500 cycles), as well as outstanding rate capability and durability. The splendid lithium storage property of sandwiched Bi 2 Se 3 @C is anticipated to provide a feasible method for designing and constructing other anode materials.