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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Modified SiO hierarchical structure materials with improved initial coulombic efficiency for advanced lithium-ion
Lizhao Xie1, Hui Liu1, Shaoxiong Lin1
1Hefei Guoxuan High-Tech Power Energy Co., Ltd. Hefei P. R. China gguo002@e.ntu.edu.sg.
RSC Advances
|May 6, 2022
Summary
Researchers developed a novel Si/SiO/Li2SiO3@C structure for lithium-ion batteries. This material offers improved lithium storage capacity and addresses challenges like volume expansion and low initial efficiency.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Silicon anodes are crucial for high energy density lithium-ion batteries.
- Challenges include particle pulverization due to volume changes and low initial coulombic efficiency from solid electrolyte interface instability.
Purpose of the Study:
- To develop a stable silicon-based anode material for lithium-ion batteries.
- To overcome the limitations of silicon anodes, such as volume expansion and SEI instability.
Main Methods:
- Fabrication of Si/SiO/Li2SiO3@C structures using SiO, pitch powder, and Li2CO3/PVA solution.
- Annealing treatment to form the composite structure.
- Characterization of electrochemical performance for lithium storage.
Main Results:
- The Si/SiO/Li2SiO3@C composite delivered a high discharge capacity of 1645.47 mA h g-1 at 100 mA g-1.
- Achieved a first cycle coulombic efficiency (C.E.) of 69.05%.
- Demonstrated improved stability and lithium storage capabilities.
Conclusions:
- The facile synthesis method effectively integrates prelithiation and carbon coating for SiO anodes.
- The macro-scale Si/SiO/Li2SiO3@C structures show practical potential for advanced lithium-ion battery technology.
