An additive-free silicon anode in nanotube morphology as a model lithium ion battery material

Ying Zhuo, Hong Sun, Md Helal Uddin, Maïssa K.S. Barr, Dorothea Wisser, Philip Roßmann, Julian D. Esper, Sarah Tymek, Dirk Döhler, Wolfgang Peukert, Martin Hartmann, Julien Bachmann

Research output: Contribution to journalArticlepeer-review

Abstract

Ordered arrays of parallel, cylindrical silicon nanotubes are obtained by aluminothermic reduction of SiO2 nanotubes generated by atomic layer deposition (ALD) on nanoporous aluminum oxide templates. The reduction to amorphous Si (a-Si) is characterized by a combination of X-ray diffraction (XRD), solid-state cross-polarization magic-angle spinning nuclear magnetic resonance (29Si CP-MAS NMR), ultraviolet-visible spectroscopy, attenuated total reflectance infrared spectroscopy (ATR-IR), and X-ray photoelectron spectroscopy (XPS). These a-Si nanotube arrays are electrochemically active in a lithium-ion battery environment when prepared on Cu current collectors without any additives. The absence of the traditional additive carbon black, which is an electrochemically inert conductor, increases the proportion of capacity associated with faradaic reactions (Li incorporation) with respect to the capacitive component. Electrochemical impedance spectroscopy (EIS) and charge-discharge tests demonstrate that the nanotube morphology yields an improved tolerance to fast cycling.

Original languageEnglish
Article number138522
JournalElectrochimica Acta
Volume388
DOIs
StatePublished - 20 Aug 2021

Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Keywords

  • Aluminothermic reduction
  • Anode material
  • Atomic layer deposition
  • Lithium ion battery
  • Si nanotube

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