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Surface nitridation of Si enabled gradient artificial solid electrolyte interface and self-optimized structural evolution
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DOI：10.1016/j.scib.2025.07.014.png)
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Abstract
En 中文
Silicon (Si), a promising high-capacity anode material for lithium-ion batteries, suffers from severe volume changes upon cycling, leading to rapid capacity fading. This study mitigates the capacity fading issue by introducing a surface SiNx layer on micron Si, which is in-situ converted into a LixSiNy-based artificial solid electrolyte interphase (SEI). This artificial SEI not only effectively restricts SEI growth to the outmost surface, but also induces a self-optimized structural evolution of the inner Si from micron particles to nanoporous network within 20 cycles. This self-optimized nanoprous Si network exhibits low volume expansion and enhanced reaction kinetics. Consequently, the Si@SiNx/TiN demonstrates a high capacity, stable cycling, and good fast-charging capability.
Keywords:
silicon anode
silicon nitride
artificial SEI
nanoporous structure
lithium-ion batteries
Journal
IF:
21.1
Papers:
5.0K
Citations:
2.2W