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Novel mesoporous Si@C microspheres as anodes for lithium-ion batteries
Xiaomei Ma1, Mingxian Liu, Lihua Gan
1Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China. liumx@tongji.edu.cn ganlh@tongji.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|January 23, 2014
Summary
We developed novel mesoporous silicon-carbon (Si@C) microspheres for advanced lithium-ion batteries. These Si@C anodes offer superior electrochemical performance and cycle stability, paving the way for next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Lithium-ion batteries (LIBs) are crucial for energy storage.
- Silicon (Si) anodes offer high theoretical capacity but suffer from poor cycle stability due to volume expansion.
- Novel anode materials are needed to improve LIB performance.
Purpose of the Study:
- To design and synthesize novel mesoporous Si@C microspheres.
- To evaluate their potential as high-performance anode materials for LIBs.
- To address the volume expansion issue of Si anodes.
Main Methods:
- Synthesis of SiO2 nanoparticles within resorcinol-formaldehyde polymer microspheres.
- Formation of mesoporous voids via carbonization and magnesiothermic reduction.
- Characterization of Si@C microspheres' morphology, size, surface area, and porosity.
- Electrochemical testing of Si@C microspheres as LIB anodes.
Main Results:
- Regular spherical Si@C microspheres (approx. 500 nm diameter) with mesopores (3.2 nm) and high surface area (401-424 m²/g) were synthesized.
- The mesoporous structure effectively buffered Si volume changes during cycling.
- Initial discharge/charge capacities of 1637/1375 mAh/g at 50 mA/g were achieved.
- After 100 cycles, a charge capacity of 1053 mAh/g with 99% coulombic efficiency was maintained.
Conclusions:
- Mesoporous Si@C microspheres demonstrate excellent electrochemical performance and cycle stability for LIB anodes.
- The unique structure effectively mitigates Si volume expansion issues.
- These materials show significant potential for high-performance lithium-ion battery applications.
