Effective Chemical Route to 2D Nanostructured Silicon Electrode Material: Phase Transition from Exfoliated Clay Nanosheet to Porous Si Nanoplate

Kanyaporn Adpakpang, Sharad B. Patil, Seung Mi Oh, Joo Hee Kang, Marc Lacroix, Seong Ju Hwang

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

An efficient and economical route for the synthesis of porous two-dimensional (2D) nanoplates of silicon is developed via the magnesiothermically-induced phase transition of exfoliated clay 2D nanosheets. The magnesiothermic reaction of precursor clay nanosheets prepared by the exfoliation and restacking with Mg2+ cations yields porous 2D nanoplates of elemental silicon. The variation in the Mg:SiO2 ratio has a significant effect on the porosity and connectivity of silicon nanoplates. The porous silicon nanoplates show a high discharge capacity of 2000 mAh g-1 after 50 cycles. Of prime importance is that this electrode material still retains a large discharge capacity at higher C-rates, which is unusual for the elemental silicon electrode. This is mainly attributed to the improved diffusion of lithium ions, charge-transfer kinetics, and the preservation of the electrical connection of the porous 2D plate-shaped morphology. This study highlights the usefulness of clay mineral as an economical and scalable precursor of high-performance silicon electrodes with tailorable nanostructures.

Original languageEnglish
Pages (from-to)60-68
Number of pages9
JournalElectrochimica Acta
Volume204
DOIs
Publication statusPublished - 2016 Jun 20

Fingerprint

Nanosheets
Silicon
Clay
Phase transitions
Electrodes
Porous plates
Porous silicon
Clay minerals
Lithium
Cations
Charge transfer
Nanostructures
Porosity
Positive ions
clay
Ions
Kinetics

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Adpakpang, Kanyaporn ; Patil, Sharad B. ; Oh, Seung Mi ; Kang, Joo Hee ; Lacroix, Marc ; Hwang, Seong Ju. / Effective Chemical Route to 2D Nanostructured Silicon Electrode Material : Phase Transition from Exfoliated Clay Nanosheet to Porous Si Nanoplate. In: Electrochimica Acta. 2016 ; Vol. 204. pp. 60-68.
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Effective Chemical Route to 2D Nanostructured Silicon Electrode Material : Phase Transition from Exfoliated Clay Nanosheet to Porous Si Nanoplate. / Adpakpang, Kanyaporn; Patil, Sharad B.; Oh, Seung Mi; Kang, Joo Hee; Lacroix, Marc; Hwang, Seong Ju.

In: Electrochimica Acta, Vol. 204, 20.06.2016, p. 60-68.

Research output: Contribution to journalArticle

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