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Updated: Jun 21, 2025
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Unveiling the In Situ Evolution of Li2O-Rich Solid Electrolyte Interface on CoOx Embedded Carbon Fibers as Li Anode
Zhimin Hao1, Dapeng Liu1, Xintao Zuo1
1Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|July 16, 2024
Summary
Metal oxides on carbon hosts create Li2O-rich solid electrolyte interfaces (SEIs) for better lithium anodes. This study confirms cobalt oxide (CoO_x) embedded in carbon nanofibers delivers oxygen for Li2O formation, enhancing stability.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Metal oxide modification of 3D carbon hosts aids Li2O-rich SEI formation.
- Li2O-rich SEIs offer fast Li+ diffusion and mitigate dendrite issues.
- The origin of oxygen in SEIs has remained unclear due to limited experimental evidence.
Purpose of the Study:
- To investigate the role of CoO_x in Li2O-rich SEI formation.
- To provide experimental evidence for the oxygen source in SEIs.
- To develop high-performance lithium anode hosts.
Main Methods:
- Synthesis of CoO_x embedded carbon nanofibers (CNF-CoO_x).
- Utilizing 18O isotope labeling to trace oxygen contribution.
- Electrochemical testing in half, symmetrical, and full cells.
Main Results:
- Successfully prepared CNF-CoO_x as effective lithium anode hosts.
- 18O isotope labeling confirmed CoO_x as a significant oxygen source for Li2O.
- The resulting SEIs exhibited enhanced Li+ migration kinetics.
Conclusions:
- CoO_x plays a crucial role in delivering oxygen for Li2O formation in SEIs.
- The CNF-CoO_x@Li anode demonstrates excellent cycling stability.
- This work clarifies the origin of oxygen in Li2O-rich SEIs and highlights a promising anode design.
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