Surface-engineered mesoporous silicon microparticles as high-Coulombic-efficiency anodes for lithium-ion batteries

Jiangyan Wang, Lei Liao, Hye Ryoung Lee, Feifei Shi, William Huang, Jie Zhao, Allen Pei, Jing Tang, Xueli Zheng, Wei Chen, Yi Cui

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

High-capacity silicon anodes suffer from rapid capacity decay due to large volume expansion, which causes mechanical fracture, electrical contact loss and unstable solid electrolyte interphase (SEI). Nanostructuring has proved to be effective in addressing these problems over the past decade; however, new issues such as poor initial Coulombic efficiencies due to increased surface area remain unsolved. Here we develop a surface-engineering strategy by depositing a dense silicon skin onto each mesoporous silicon microparticle and further encapsulating it with a conformal graphene cage, which improves both the initial and later-cycle Coulombic efficiencies. The silicon skin lowers the unfavorable electrolyte/electrode contact area and minimizes SEI formation, resulting in an initial Coulombic efficiency over twice as high as that without silicon skin coating. The graphene cage combined with the inner void space of mesoporous silicon allow for silicon expansion, which guarantees structural integrity and SEI stability, resulting in high later-cycle Coulombic efficiencies (99.8–100% for later cycles)and impressive cycling stability.

Original languageEnglish (US)
Pages (from-to)404-410
Number of pages7
JournalNano Energy
Volume61
DOIs
StatePublished - Jul 2019

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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    Wang, J., Liao, L., Lee, H. R., Shi, F., Huang, W., Zhao, J., Pei, A., Tang, J., Zheng, X., Chen, W., & Cui, Y. (2019). Surface-engineered mesoporous silicon microparticles as high-Coulombic-efficiency anodes for lithium-ion batteries. Nano Energy, 61, 404-410. https://doi.org/10.1016/j.nanoen.2019.04.070