Porous structured silicon (Si) particles has been regarded as a very promising approach to overcome pulverization of Si based anode. However, limited mechanical strength of these porous particles has limited their practical applications. Here, we designed and synthesized hierarchical carbon nanotube@silicon@carbon (CNT@Si@C) microspheres with both high porosity and extraordinary mechanical strength (> 200 Mpa) at the same time and a low apparent particle expansion of ~40% upon full lithiation. The composite electrodes of CNT@Si@C-graphite (3 mAh cm-2) deliver ~750 mAh g-1 specific capacity, 92% capacity retention over 500 cycles. This work is a leap in Si anode development and casts new insights in harnessing nanotechnology for battery research.
Revised: October 14, 2020 |
Published: March 19, 2020
Citation
Jia H., X. Li, J. Song, X. Zhang, L. Luo, Y. He, and B. Li, et al. 2020.Hierarchical Porous Silicon Structures with Extraordinary Mechanical Strength as High-Performance Lithium-Ion Battery Anodes.Nature Communications 11, no. 1:Article No. 1474.PNNL-SA-140627.doi:10.1038/s41467-020-15217-9