Spontaneous formation of the conformal carbon nanolayer coated Si nanostructures as the stable anode for lithium-ion batteries from silica nanomaterials

Xi Huang, Yicheng Ding, Kailin Li, Xuyun Guo, Ye Zhu, Yuxin Zhang, Zhihao Bao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Nanostructured-silicon with a conformal carbon coating (Si@C) is a promising anode-material for the next-generation lithium-ion battery (LIB). However, silicon nanostructure and the carbon nanocoating usually are formed in the separated processing steps, making the entire synthesis process costly, complicated and time-consuming. Herein, we propose a process in which silica nanomaterials (i.e., diatomite and stöber sphere) are firstly converted into Mg2Si. After the converted Mg2Si further reacts with CaCO3, a conformal carbon nanolayer (1–5 nm) spontaneously grows on the newly formed Si nanostructures to obtain Si@C. Especially, diatomite-derived Si@C delivers a reversible capacity of 1359.7 mA h g−1 at 4 A g−1, and retains 764.6 mA h g−1 even after 500 cycles. The process reported in this study can provide a scalable way to synthesize high-performance Si@C anode materials for LIBs.

Original languageEnglish
Article number229833
JournalJournal of Power Sources
Volume496
DOIs
Publication statusPublished - 1 Jun 2021

Keywords

  • Carbon coating
  • Composite
  • Lithium-ion battery
  • Porous
  • Silicon

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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