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Atomic/Molecular Layer-Deposited Laminated Li2O-Lithicone Interfaces Enabling High-Performance Silicon Anodes
Jiabin Fang1, Jianguo Li1, Lijun Qin1
1Laboratory of Material Surface Engineering and Nanofabrication, Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Xi'an 710065, People's Republic of China.
Researchers developed a novel lithium-containing hybrid film using atomic layer deposition and molecular layer deposition for silicon anodes in lithium-ion batteries. This film enhances initial Coulombic efficiency and interfacial stability, improving battery performance and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Silicon anodes are promising for next-generation lithium-ion batteries due to high capacity.
- Low initial Coulombic efficiency and poor interfacial stability hinder silicon anode performance.
Purpose of the Study:
- To address limitations of silicon anodes by fabricating a protective hybrid film.
- To improve initial Coulombic efficiency and interfacial stability of silicon anodes.
Main Methods:
- Utilized atomic layer deposition (ALD) and molecular layer deposition (MLD) to create a Li2O-lithicone hybrid film.
- Characterized interfacial components and analyzed stress relief using finite element modeling.
- Investigated Li+ migration kinetics using galvanostatic intermittent titration and DFT calculations.
Main Results:
- Achieved 91.2% initial Coulombic efficiency and sustained capacity over 646 mA h g-1 after 850 cycles.
- Demonstrated enhanced interfacial stability and reduced stress in the silicon anode.
- Observed fast Li+ migration kinetics facilitated by the hybrid film.
Conclusions:
- The engineered lithium-based hybrid film significantly improves silicon anode performance.
- ALD/MLD techniques offer precise control for advanced battery materials.
- Understanding interfacial mechanisms is crucial for developing high-performance silicon anodes.
