Acta Metallurgica Sinica (English Letters) ›› 2021, Vol. 34 ›› Issue (3): 347-353.DOI: 10.1007/s40195-020-01117-w

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Facile Synthesis of Yolk-Shell Bi@C Nanospheres with Superior Li-ion Storage Performances

Xijun Xu1,2, Dechao Zhang1, Zhuosen Wang1, Shiyong Zuo1, Jiadong Shen1, Zhengbo Liu1, Jun Liu1()   

  1. 1Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
    2School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China
  • Received:2020-05-08 Revised:2020-06-23 Accepted:2020-06-29 Online:2021-03-10 Published:2021-03-10
  • Contact: Jun Liu
  • About author:Jun Liu, msjliu@scut.edu.cn

Abstract:

Recently, exploring appropriate anode materials for current commercial lithium-ion batteries (LIBs) with suitable operating potential and long cycle life has attracted extensive attention. Herein, a novel anode of Bi nanoparticles fully encapsulated in carbon nanosphere framework with uniform yolk-shell nanostructure was prepared via a facile hydrothermal method. Due to the special structure design, this anode of yolk-shell Bi@C can effectively moderate the volume exchange, avoid the aggregation of active Bi nanoparticle and provide superior kinetic during discharge/charge process. Cycling in the voltage of 0.01-2.0 V, yolk-shell Bi@C anode exhibits outstanding Li+ storage performance (a reversible capacity over 200 mAh g-1 after 400 cycles at 1.25 A g-1) and excellent rate capability (a capacity of 404, 347, 304, 275, 240, 199 and 163 mAh g-1 at 0.05, 0.1, 0.25, 0.5, 1.0, 1.8 and 3.2 A g-1, respectively). This work indicates that rational design of nanostructured anode materials is highly applicable for the next-generation LIBs.

Key words: Yolk-shell structure, Li-ion batteries, Alloying type, Bismuth, Rate capability