Dual network porous Si/Al9FeSi3/Fe2O3 composite for high performance Li-ion battery anode

Weimin Zhao, Jingjing Wen, Xiaoli Liu, Zhifeng Wang, Chunling Qin, Yan Zhao, Zhumabay Bakenov

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Silicon (Si) is regarded as the most prominent anode material for lithium ion batteries (LIBs) because of its high theoretical specific capacity. However, Si-based anodes suffer from fast capacity degradation caused by drastic volume expansion/contraction during repeated charge/discharge process and accompanying internal mechanical strain. Herein, we report a new dealloying strategy to synthesize a dual network porous Si/Al9FeSi3/Fe2O3 composite, which can release the internal stress and accommodate the volume changes of the anode during cycling. The anode presents a high Li storage capability, revealing an excellent reversible capacity of 1100 mAh g 1 at 200 mA g 1 for 150 cycles and 378 mAh g 1 at 4000 mA g 1 for 500 cycles. Such outstanding Li storage properties can be attributed to the special dual network porous structure and compositing the materials with high and low theoretical capacities. The work provides a new route to design and prepare low-price and high-performance Si-based anodes, which opens new avenues for the technical progress in dealloying preparation and the development of advanced high performance anode materials.

Original languageEnglish
Article number136936
JournalElectrochimica Acta
Volume358
DOIs
Publication statusPublished - Oct 20 2020

Keywords

  • Anode
  • Dealloying
  • Dual network
  • Li-ion battery
  • Nanoporous

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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