Facile and Efficient Fabrication of Branched Si@C Anode with Superior Electrochemical Performance in LIBs

Li Cao, Ting Huang, Mengya Cui, Jiejie Xu, Rongshi Xiao

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

One-dimensional Si nanostructures with carbon coating (1D Si@C) show great potential in lithium ion batteries (LIBs) due to small volume expansion and efficient electron transport. However, 1D Si@C anode with large area capacity still suffers from limited cycling stability. Herein, a novel branched Si architecture is fabricated through laser processing and dealloying. The branched Si, composed of both primary and interspaced secondary dendrites with diameters under 100 nm, leads to improved area capacity and cycling stability. By coating a carbon layer, the branched Si@C anode shows gravimetric capacity of 3059 mAh g−1 (1.14 mAh cm−2). At a higher rate of 3 C, the capacity is 813 mAh g−1, which retained 759 mAh g−1 after 1000 cycles at 1 C. The area capacity is further improved to 1.93 mAh cm−2 and remained over 92% after 100 cycles with a mass loading of 0.78 mg cm−2. Furthermore, the full-cell configuration exhibits energy density of 405 Wh kg−1 and capacity retention of 91% after 200 cycles. The present study demonstrates that laser-produced dendritic microstructure plays a critical role in the fabrication of the branched Si and the proposed method provides new insights into the fabrication of Si nanostructures with facility and efficiency.

Original languageEnglish
Article number2005997
JournalSmall
Volume17
Issue number14
DOIs
Publication statusPublished - 2021 Apr 8
Externally publishedYes

Keywords

  • branched Si
  • dealloying
  • laser processing
  • LIBs
  • Si@C

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Facile and Efficient Fabrication of Branched Si@C Anode with Superior Electrochemical Performance in LIBs'. Together they form a unique fingerprint.

Cite this