Bi@C fibre synthesized by electrostatic spinning as high-performance anode material for Li-ion batteries

Bismuth-based material as a stable anode material for lithium-ion battery, which has the advantages of stable operating voltage and large volume energy density. In order to make the most of the theoretical specific capacity of 386 mAh g −1 bismuth-based materials, the carbon coating method will be used to obtain stable specific capacity. However, electrostatic spinning is great method of carbon coated precursor preparation. Here, the BiCl3 reagent is added into the PAN-DMF spinning liquid to synthesize the fibrous Bi@C composites precursor, and the Bi@C fibre is obtained after heat treatment. Then the Bi@C fibres with different BiCl3 content are used as anode materials for lithium-ion batteries to test the electrochemical performance of Bi@C. The results show that Bi@C fibre electrode can maintain the discharge capacity of 415.3 mAh g−1 at the current density of 100 mA g−1 for 100 cycles when the content of BiCl3 is 1.5 g. When the current density is 500 mA g−1, the specific capacity can still reach 415.7 mAh g−1 after 250 cycles and shows excellent electrochemical performance.