Preparation of polypyrrole-coated Bi₂O₃@CMK-3 nanocomposite for electrochemical lithium storage

Polypyrrole-coated Bi₂O₃@CMK-3 nanocomposite is prepared by nanocasting technique and chemical polymerization method. Bi₂O₃ nanoparticles are dispersed into CMK-3 matrix, and polypyrrole is coated onto the surface of Bi₂O₃@CMK-3. Polypyrrole-coated Bi₂O₃@CMK-3 nanocomposite as an anode material for lithium-ion batteries has an outstanding power capability (321 mAh g⁻¹ at a current rate of 6 A g⁻¹) and a significantly improved cycling ability (380 mAh g⁻¹ after 1000 cycles at a current rate of 5 A g⁻¹). The greatly enhanced electrochemical performance of polypyrrole-coated Bi₂O₃@CMK-3 nanocomposite is associated with the synergistic effect of highly conductive CMK-3, polypyrrole layer and Bi₂O₃ nanoparticles. Such a configuration inhibits the aggregation of Bi₂O₃ nanoparticles and preserves the structure integrity of electrode material, in addition to highly improving the electrical conductivity and maintaining the stable structure of solid electrolyte interface film.