期刊
APPLIED SURFACE SCIENCE
卷 578, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151982
关键词
Silicon anode; Aluminum oxynitride; Lithium-ion batteries; Atomic layer deposition
类别
资金
- Nature Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- BC Knowledge Development Fund (BCKDF)
- Mitacs Accelerate Program, MGX Minerals
- University of British Columbia (UBC)
A novel surface coating material, AlOxNy, was developed to improve the electrochemical performance of Si anodes in lithium-ion batteries. The AlOxNy coating significantly enhanced the reversible capacity and capacity retention of the Si electrodes by suppressing the charge transfer and SEI resistances and maintaining the structural integration.
Silicon (Si) has received great attention as a promising anode material for lithium-ion batteries (LIBs) due to its high gravimetric capacity and large abundance. However, the use of Si anodes in LIBs has been hindered by their inferior electrochemical performance, resulting from its vast volume expansion and unstable solid electrolyte interphase (SEI). To address these problems, a novel surface coating material, aluminum oxynitride (AlOxNy), was developed using a plasma-enhanced atomic layer deposition technique with trimethylaluminum and plasma N-2/H-2 as the precursors. The effects of AlOxNy surface coatings on the electrochemical properties of Si electrodes were investigated. With the optimal AlOxNy coating (similar to 2 nm), the reversible capacity after 140 cycles was improved from 331 mAh g(-1) for bare Si electrode to 1297 mAh g(-1) for AlOxNy-coated one, and the capacity retention was elevated from 13% to 72%. Post-cycling analysis revealed that the AlOxNy coating significantly suppressed the charge transfer and SEI resistances and maintained the structural integration of Si electrodes by suppressing continuous electrolyte decomposition and electrode delamination from the current collector. This study provides a new perspective on designing advanced functional coating materials for atomic layer deposition for lithium-ion batteries.
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