SnO₂ Particles Embedded into Carbon Coated Mesoporous SiO_x Rod as High Volumetric Capacity Anode for Lithium-ion Batteries

Authors

Ni-Ni Li #, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xian 710021, Shaanxi, China.
Jia-Lin Guo #, Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, College of Chemical Engineering and Modern Materials, Shang Luo University, Shang Luo 726000, Shaanxi, China.
Peng Zheng, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xian 710021, Shaanxi, China.Follow

Document Type

Article

Corresponding Author(s)

Peng Zheng(zhengpeng@sust.edu.cn)

Abstract

Due to the high capacity and moderate volume expansion of SiO_x (160 %) compared with that of Si (300 %), reducing SiO₂ into SiO_x while maintaining its special nano-morphology makes it attractive as an anode of Li-ion batteries. Herein, through one-pot facile high-temperature annealing, mesoporous SiO_x-SnO₂@C is prepared from SBA15 as a silicon source. Where SnO₂ particles are distributed uniformly in the wall, which could further improve their volume energy densities. The coated carbon plays the role of maintaining structural integrality during lithiation, and the rich mesopores structure can release the expanded volume and enhance Li-ion transfer. At 0.1 A g^-1, the gravimetric and volumetric capacities of mesoporous SiO_x are as high as 1271 mAh g^-1and 1573 mAh cm^-3, respectively. After 200 cycles, 95 % capacity is retained compared with the 2nd cycle at 0.5 A g^-1. And the rod morphology is still kept, except that the diameter of the rod is 3 times larger than its original size after the cell discharges into 0.01 V.

Graphical Abstract

Keywords

carbon coating, mesoporous SiOx, anode, Li-ion battery

DOI

10.61558/2993-074X.3520

Online Date

1-13-2025

Recommended Citation

Jia-Lin Guo, Ni-Ni Li, Peng Zheng. SnO₂ Particles Embedded into Carbon Coated Mesoporous SiO_x Rod as High Volumetric Capacity Anode for Lithium-ion Batteries[J]. Journal of Electrochemistry, doi: 10.61558/2993-074X.3520.