A highly stable SiOx-based anode enabled by self-assembly with polyelectrolyte

Runsheng Gao, Jie Tang, Xiaoliang Yu, Kun Zhang, Kiyoshi Ozawa, Lu Chang Qin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Silicon-based materials with high specific capacities have attracted great attentions as an alternative to graphite anode in lithium-ion batteries. However, the low electrical conductivity and inefficient suppression of volume expansion make it somewhat unsuitable for practical applications. Thence, a rapid self-encapsulating approach was first adopted to construct a conductive and effective carbon protective shell on the surface of layered SiOx-based nanosheets by compositing polyelectrolyte (polyethyleneimine, PEI) with graphene oxide (GO). This designed composite electrode has a compact and robust interfacial structure attributed to chemical integration and electrostatic interactions, which also greatly increased the tap density of the electrode. As an anode material, it delivered a high reversible capacity of 867 mAh g−1 and excellent rate capability. The cycling stability is also retained even after rate performance test, which resulted a −0.033% capacity decay rate for each cycle in 500 cycles.

Original languageEnglish
Article number136958
JournalElectrochimica Acta
Volume360
DOIs
Publication statusPublished - 10 Nov 2020
Externally publishedYes

Keywords

  • Electrochemistry
  • Electrostatic interaction
  • Layered silicon oxide
  • Lithium storage

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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