Carbon-coated mesoporous silicon microsphere anodes with greatly reduced volume expansion

Zheng Long Xu, Yang Gang, Mohammad Akbari Garakani, Sara Abouali, Jian Qiu Huang, Jang Kyo Kim (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

65 Citations (Scopus)

Abstract

Carbon-coated nanostructured silicon (Si/C) composites are promising anodes for next-generation lithium-ion batteries, but scalable synthesis of such materials with an anti-pulverization capability, high areal capacity and long cycle life still remains a challenge. In this work, mesoporous Si/C microspheres of ∼165 nm diameter are synthesized by magnesiothermic reduction of porous silica followed by chemical vapor deposition of a thin carbon layer. They consist of numerous primary Si nanocrystals of ∼10 nm diameter which are interconnected, surrounded by abundant internal pores and coated with conductive graphitic carbon. These ameliorating structural and functional features offer a unique synergy that contributes to prevention of pulverization of Si/C microspheres with a highly reduced volume expansion of ∼85% upon full lithiation. The Si/C electrodes deliver a reversible capacity of ∼1500 mA h g-1 at 0.1 A g-1, an exceptional long-term stability of ∼90% capacity retention even after 1000 and 2500 cycles at 1.0 and 4.0 A g-1, respectively, and an excellent areal capacity of ∼1.44 mA h cm-2 after 500 cycles.

Original languageEnglish
Pages (from-to)6098-6106
Number of pages9
JournalJournal of Materials Chemistry A
Volume4
Issue number16
DOIs
Publication statusPublished - 28 Apr 2016
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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