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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Superior lithium electroactive mesoporous Si@carbon core-shell nanowires for lithium battery anode material
1Department of Applied Chemistry, Hanyang University, Ansan, 426-791 Korea.
Nano Letters
|October 28, 2008
Summary
Mesoporous silicon-carbon core-shell nanowires were developed as advanced lithium battery anode materials. These nanowires exhibit high initial capacity and excellent cycle stability for improved energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Developing high-performance anode materials is crucial for advancing lithium-ion battery technology.
- Silicon offers high theoretical capacity but suffers from poor cycling stability due to volume expansion.
- Carbon coating can mitigate silicon's volume expansion and improve conductivity.
Purpose of the Study:
- To synthesize and characterize mesoporous Si@carbon core-shell nanowires for lithium battery anodes.
- To evaluate the electrochemical performance of these novel anode materials.
Main Methods:
- Mesoporous Si@carbon core-shell nanowires were synthesized using a SBA-15 template.
- Coin-type half-cells were assembled to test the anode material's performance.
- Electrochemical testing included charge-discharge cycling and rate capability measurements.
Main Results:
- The synthesized nanowires possess a diameter of approximately 6.5 nm.
- An excellent first charge capacity of 3163 mA h/g was achieved at 0.2 C.
- Capacity retention after 80 cycles was 87%, with good rate capability (78% at 2 C).
Conclusions:
- Mesoporous Si@carbon core-shell nanowires are promising anode materials for lithium batteries.
- The core-shell structure effectively enhances cycling stability and rate performance.
- These materials offer a viable pathway towards next-generation high-energy-density batteries.
