Electrode reaction-driven orientation regrowth of Fe2O3 crystals from novel dendritic architecture in anode of lithium-ion batteries

作者:Xie, Yishun; Mu, Qingchuang; Lai, Feiyan; Yang, Guangchang; Zhang, Huijun; Lu, Shaorong*; Chen, Zheng; Zhang, Xiaohui*; Li, Qingyu
来源:Journal of Alloys and Compounds, 2022, 925: 166681.
DOI:10.1016/j.jallcom.2022.166681

摘要

Morphology design is one effective strategy for improving the rate capability and cycling stability of Fe2O3 anode material for lithium-ion batteries. Herein, a kind of dendritic Fe2O3 architecture was prepared through a hydrothermal route in which glycine molecules guide crystal growth and turn into carbon in the final composite. The special coralloid Fe2O3/NC composite integrates the structure advantages of porous and low-dimensional regular electrode materials. The mutually supportive architecture provides more space to exchange ions with electrolyte and accommodate mechanical stress to suppress volume change, and im-proves better electron conductivity compared to isolated particles. The Fe2O3/NC delivers 837.6 mAh g(-1) at 10 A g(-1) and maintains 788 mAh g(-1) after a long-term life of 1000 cycles. One more discovery is that the dendritic Fe2O3 architecture grows into needle-like crystals driven by electrode reaction revolved to ion migration and crystal regeneration.

  • 单位
    桂林理工大学