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Boron doping-induced interconnected assembly approach for mesoporous silicon oxycarbide architecture
Guanjia Zhu1, Rui Guo1, Wei Luo1
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, International Joint Laboratory for Advanced Fiber and Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
National Science Review
|October 25, 2021
Summary
We developed a boron doping method to create strongly connected mesoporous silicon oxycarbide nanospheres. This novel assembly technique enhances stability and performance for lithium-ion battery anodes.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Current assembly methods for nanostructured materials suffer from weak interparticle connections, limiting their performance.
- Developing robust and interconnected nanostructures is crucial for advanced energy storage applications.
Purpose of the Study:
- To introduce a novel boron doping-induced interconnection-assembly approach for mesoporous silicon oxycarbide nanospheres.
- To investigate the mechanism behind boron doping-induced assembly and its impact on material properties.
Main Methods:
- Fabrication of mesoporous silicon oxycarbide nanospheres using periodic mesoporous organosilicas.
- Boron doping to induce interconnection and strong coupling between nanospheres.
- Characterization of the assembled architecture and analysis of the boron-doped species.
Main Results:
- An unprecedented assembly of interconnected, strongly coupled mesoporous silicon oxycarbide nanospheres with coarse surfaces was successfully fabricated.
- A novel melt-etching and nucleation-growth mechanism was proposed based on the analysis of boron-doped species.
- The strategy demonstrated precise controllability over interconnection size, surface roughness, and primary nanoparticle characteristics.
Conclusions:
- The boron doping-induced interconnection-assembly approach provides a versatile method for creating advanced nanostructured materials.
- The interconnected assembly with tunable surface roughness offers intrinsically dual (structural and interfacial) stability.
- This architecture achieved extraordinary long-term cycle life when utilized as a lithium-ion battery anode.
