CNTs@C@Bi2Se3 composite as an improved-performance anode for lithium ion batteries

Abstract Bi 2 Se 3 with layered structure has been considered as a promising host for Li ion batteries due to its high electrical conductivity. However, the disadvantages such as dissolution loss of selenium species and the large volume expansion extremely hinder its practical application. Here, the electrochemical performance is improved by synthesizing CNTs@C@Bi 2 Se 3 nanocomposites. The electrochemical measurements results indicate that the CNTs@C@Bi 2 Se 3 delivers high rate capacity (222 mA h g −1 at 2000 mA g −1 ) and long-term cycle stability (243 mA h g −1 after 300th cycles at 1000 mA g −1 ). Moreover, the electrochemical reaction mechanism is proposed based on the ex situ HRTEM technique.