3D amorphous silicon on nanopillar copper electrodes as anodes for high-rate lithium-ion batteries

Gyutae Kim, Sookyung Jeong, Ju Hyeon Shin, Jaephil Cho, Heon Lee

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

We present an amorphous Si anode deposited on a Cu nanopillar current collector, fabricated using a thermal roll-to-roll process followed by electroformation and LPCVD, for application in high-rate Li-ion batteries. Cu nanopillar current collectors with diameters of 250 and 500 nm were patterned periodically with 1 μm pitch and 2 μm height to optimize the diameters of the pillars for better electrochemical performance. Void spaces between Cu nanopillars allowed not only greater effective control of the strain caused by the Si expansion during lithiation than that allowed by a nonpatterned electrode but also significantly improved cycle performance even at 20 C measured after the same rate test: After 100 cycles at 0.5 C, the patterned electrodes with 250 and 500 nm diameter nanopillars showed high capacity retentions of 86% and 84%, respectively. These electrodes retained discharge capacities of 1057 and 780 mAh/g even at 20 C, respectively.

Original languageEnglish
Pages (from-to)1907-1912
Number of pages6
JournalACS nano
Volume8
Issue number2
DOIs
Publication statusPublished - 2014 Feb 25

Keywords

  • Li-ion battery
  • high C rate
  • patterned current collector
  • roll to roll
  • thin-film Si

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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