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Published on: March 7, 2018
Uniform nano-Sn/C composite anodes for lithium ion batteries
Yunhua Xu1, Qing Liu, Yujie Zhu
1Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA.
Nano Letters
|January 4, 2013
Summary
Nano-tin/carbon (Sn/C) composite spheres offer superior performance for lithium-ion batteries. This facile aerosol spray pyrolysis method uniformly disperses 10 nm nano-Sn within a carbon matrix, enabling high capacity and rate capabilities.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Tin (Sn) and its carbon composites are promising anode materials for high energy and power density lithium-ion batteries.
- Challenges include Sn's low melting point and grain growth, hindering uniform nanoparticle dispersion within carbon matrices.
- Developing stable, high-performance Sn-based anodes is crucial for advanced battery technologies.
Purpose of the Study:
- To synthesize nano-Sn/C composite spheres with uniformly dispersed ultrasmall Sn nanoparticles.
- To evaluate the electrochemical performance of these nano-Sn/C composite spheres as anode materials for lithium-ion batteries.
- To investigate the structural attributes contributing to the enhanced battery performance.
Main Methods:
- Aerosol spray pyrolysis technique was employed for facile and scalable synthesis of nano-Sn/C composite spheres.
- Characterization of the composite structure, focusing on Sn nanoparticle size and dispersion within the carbon matrix.
- Electrochemical testing, including cycling stability and rate performance evaluation at various C-rates.
Main Results:
- Uniform dispersion of 10 nm nano-Sn within spherical carbon matrices was achieved.
- The nano-Sn/C composite anodes exhibited an initial discharge capacity of 710 mAh/g after 130 cycles at 0.25 C.
- Remarkable high-rate performance was demonstrated, with capacities around 600 mAh/g even at 20 C, surpassing previously reported data for Sn anodes.
Conclusions:
- The synthesized nano-Sn/C composite spheres demonstrate exceptional electrochemical performance for lithium-ion battery anodes.
- The unique structure, featuring a supportive carbon matrix, effectively accommodates Sn volume changes and prevents agglomeration.
- This facile synthesis method and superior performance highlight the potential of nano-Sn/C composites for next-generation energy storage.
