Scalable One-Pot Synthesis of Hierarchical Bi@C Bulk with Superior Lithium-Ion Storage Performances

Abstract

Lithium-ion batteries (LIBs), the most successful commercial energy storage devices, are now widespread in our daily life. However, the lack of appropriate electrode materials with long lifespan and superior rate capability is the urgent bottleneck for the development of high-performance LIBs. Herein, a hierarchical [email protected] bulk is developed via a scalable pyrolysis method. Due to the ultrafine size of Bi nanoparticles and in situ generated porous carbon framework, this [email protected] anode evidently facilitates the diffusion of Li⁺/electron, availably inhibits the agglomeration of active nano-Bi, and effectively mitigates the volume fluctuation. This hierarchical [email protected] bulk exhibits stable cycling performance for both LIBs (256 mAh g^–1 at 1.0 A g^–1 over 1400 cycles) and potassium-ion batteries (271 mAh g^–1 at 0.1 A g^–1 for 200 cycles). More importantly, when coupled with a commercial LiCoO₂ cathode, the assembled LiCoO₂//[email protected] cells provide an output voltage of 2.9 V and retain a capacity of 202 mAh g^–1 at 0.15 A g^–1. Moreover, kinetic analysis and in situ X-ray diffraction characterization reveal that the [email protected] anode displays a dominated pseudocapacitance behavior and a typical alloying storage mechanism during the cycling process.