A Yolk-Shell Structured Silicon Anode with Superior Conductivity and High Tap Density for Full Lithium-Ion Batteries

Authors

Lei Zhang, Griffith University
Chengrui Wang, Griffith University
Yuhai Dou, Griffith University
Ningyan Cheng, University of WollongongFollow
Dandan Cui, University of Wollongong
Yi Du, University of WollongongFollow
Porun Liu, Griffith University
Mohammad Al-Mamun, Griffith University
Shanqing Zhang, Griffith University
Huijun Zhao, Chinese Academy Of Sciences, Griffith University

RIS ID

136139

Publication Details

Zhang, L., Wang, C., Dou, Y., Cheng, N., Cui, D., Du, Y., Liu, P., Al-Mamun, M., Zhang, S. & Zhao, H. (2019). A Yolk-Shell Structured Silicon Anode with Superior Conductivity and High Tap Density for Full Lithium-Ion Batteries. Angewandte Chemie - International Edition, 131 (26), 8916-8920.

Abstract

The poor cycling stability resulting from the large volume expansion caused by lithiation is a critical issue for Si-based anodes. Herein, we report for the first time of a new yolk-shell structured high tap density composite made of a carbon-coated rigid SiO2 outer shell to confine multiple Si NPs (yolks) and carbon nanotubes (CNTs) with embedded Fe2O3 nanoparticles (NPs). The high tap density achieved and superior conductivity can be attributed to the efficiently utilised inner void containing multiple Si yolks, Fe2O3 NPs, and CNTs Li+ storage materials, and the bridged spaces between the inner Si yolks and outer shell through a conductive CNTs "highway". Half cells can achieve a high area capacity of 3.6 mAh cm−2 and 95 % reversible capacity retention after 450 cycles. The full cell constructed using a Li-rich Li2V2O5 cathode can achieve a high reversible capacity of 260 mAh g−1 after 300 cycles.