Graphene oxide-immobilized NH2-terminated silicon nanoparticles by cross-linked interactions for highly stable silicon negative electrodes

Cheng Sun, Yuanfu Deng, Lina Wan, Xusong Qin, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

53 Citations (Scopus)

Abstract

There is a great interest in the utilization of silicon-based anodes for lithium-ion batteries. However, its poor cycling stability, which is caused by a dramatic volume change during lithium-ion intercalation, and intrinsic low electric conductivity hamper its industrial applications. A facile strategy is reported here to fabricate graphene oxide-immobilized NH2-terminated silicon nanoparticles (NPs) negative electrode (Si@NH2/GO) directed by hydrogen bonding and cross-linked interactions to enhance the capacity retention of the anode. The NH2-modified Si NPs first form strong hydrogen bonds and covalent bonds with GO. The Si@NH2/GO composite further forms hydrogen bonds and covalent bonds with sodium alginate, which acts as a binder, to yield a stable composite negative electrode. These two chemical cross-linked/hydrogen bonding interactions - one between NH2- modified Si NPs and GO, and another between the GO and sodium alginate - along with highly mechanically flexible graphene oxide, produced a robust network in the negative electrode system to stabilize the electrode during discharge and charge cycles. The as-prepared Si@NH2/GO electrode exhibits an outstanding capacity retention capability and good rate performance, delivering a reversible capacity of 1000 mAh g-1after 400 cycles at a current of 420 mA g-1with almost 100% capacity retention. The results indicated the importance of system-level strategy for fabricating stable electrodes with improved electrochemical performance.
Original languageEnglish
Pages (from-to)11277-11285
Number of pages9
JournalACS Applied Materials and Interfaces
Volume6
Issue number14
DOIs
Publication statusPublished - 23 Jul 2014
Externally publishedYes

Keywords

  • cross-linking
  • cycling stability
  • graphene oxide
  • Li-ion batteries
  • Si-based anode

ASJC Scopus subject areas

  • Materials Science(all)

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