Superior long-life and high-rate Ge nanoarrays anchored on Cu/C nanowire frameworks for Li-ion battery electrodes

Gwang Hee Lee, Hyun Woo Shim, Dong-Wan Kim

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We fabricated two types of three-dimensional (3-D) nanoarchitectured current collectors consisting of one-dimensional (1-D) Cu/C core/sheath nanowires and two-dimensional (2-D) Cu/C core/sheath nanonets. High-capacity Ge nanoarrays were deposited onto the as-prepared Cu/C nanowires or Cu/C nanonets via thermal evaporation and a GeO2 removal process. The obtained samples have advantages over Li-ion battery anodes because of the highly porous ordered and aligned nanostructures. The Cu/C nanonet-based Ge anodes exhibited a large reversible capacity of 933mAhg-1 at a rate of 1C over 1000 cycles and an excellent rate capability of 1017mAhg-1 at a rate of 10C over 200 cycles. We demonstrated that the 3-D nanoarchitecture technology has significant advantages such as a long cycle life and high-rate capabilities for the anode design of Li-ion batteries during the Li-Ge alloying process.

Original languageEnglish
Pages (from-to)218-225
Number of pages8
JournalNano Energy
Volume13
DOIs
Publication statusPublished - 2015 Apr 1

Keywords

  • 3-D nanoarchitectures
  • Cu/C nanowire frameworks
  • High-rate capabilities
  • Long cycle life
  • Porous Ge nanoarrays

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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