A new approach to synthesis of porous SiOx anode for Li-ion batteries via chemical etching of si crystallites

Byeong Chul Yu, Yoon Hwa, Jae Hun Kim, Hun Joon Sohn

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

Unlike previous HF etching of Si oxides to produce porous Si a new concept for the preparation of porous SiOx was suggested adopting Si as a pore generating agent and Si oxides as template using NaOH solution. The heat treatment of pristine SiO at 900 C provided nano-crystalline Si within the SiOx matrix. The nano-crystalline Si was dissolved to provide pore size of 200∼500 nm, while most of the SiOx matrix remained as a template during NaOH etching. The surface area of the etched SiO was increased more than 5 times compared with not-etched SiO. The porous SiOx anode exhibited a stable reversible capacity of about 1240 mAh g-1 over 100 cycles at 0.2 C.

Original languageEnglish (US)
Pages (from-to)426-430
Number of pages5
JournalElectrochimica Acta
Volume117
DOIs
StatePublished - Jan 20 2014
Externally publishedYes

Keywords

  • Anode
  • Lithium batteries
  • NaOH etching
  • Porous SiO
  • Selflate

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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