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

Authors

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

Corresponding Author

Peng Zheng (zhengpeng@sust.edu.cn)

Abstract

Due to the high capacity and moderate volume expansion of silicon protoxide SiO_x (160%) compared with that of Si (300%), reducing silicon dioxide SiO₂ into SiO_x while maintaining its special nano-morphology makes it attractive as an anode of Li-ion batteries. Herein, through a one-pot facile high-temperature annealing route, using SBA15 as the silicon source, and embedding tin dioxide SnO₂ particles into carbon coated SiO_x, the mesoporous SiO_x-SnO₂@C rod composite was prepared and tested as the anode material. The results revealed that the SnO₂ particles were distributed uniformly in the wall, which could further improve their volume energy densities. The coated carbon plays a role in 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 the composite were as high as 1271 mAh·g^–1 and 1573 mAh·cm^–3, respectively. After 200 cycles, the 95% capacity could be retained compared with that upon the 2nd cycle at 0.5 A·g^–1. And the rod morphology was well kept, except that the diameter of the rod was 3 times larger than its original size after the cell was discharged into 0.01 V.

Graphical Abstract

Keywords

Carbon coating, Mesoporous SiOx, Anode, Li-ion battery

DOI Link

https://doi.org/10.61558/2993-074X.3520

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Publication Date

2025-02-28

Online Available Date

2025-01-13

Revised Date

2024-12-30

Received Date

2024-10-17

Recommended Citation

Jia-Lin Guo, Ni-Ni Li, Peng Zheng. SnO₂ Particles Embedded into Carbon Coated Mesoporous SiOx Rod as High Volumetric Capacity Anode for Lithium-ion Batteries[J]. Journal of Electrochemistry, 2025 , 31(2): 2410171.
DOI: 10.61558/2993-074X.3520
Available at: https://jelectrochem.xmu.edu.cn/journal/vol31/iss2/3