3-Hexylthiophene as a stabilizing additive for high voltage cathodes in lithium-ion batteries

Ali Abouimrane, Susan A. Odom, Hadi Tavassol, Matthew V. Schulmerich, Huiming Wu, Rohit Bhargav, Andrew A. Gewirth, Jeffrey S. Moore, Khalil Amine

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34 Citations (Scopus)

Abstract

3-Hexylthiophene was incorporated into battery electrolyte as a life-extending additive. Upon oxidation, this monomer forms a conductive, conjugated polymer, resulting in significant increase in the cycle lifetimes of lithium half-cells containing high capacity Li1.2Ni0.15Co0.1Mn0.55O2 and high voltage LiNi0.5Mn1.5O4 cathodes. This additive significantly reduces the interfacial impedance growth observed in the cell without additive, which indicates an effective protection of the interface when using 3-hexythiophene. We also observed an improvement in safety when 3-hexylthiophene was incorporated. Electron microscopy images show the new polymer on the cathode surface, specifically poly(3-hexylthiophene) as supported by characterization of the cathode surface using vibrational spectroscopy (Raman and infrared) and mass spectrometry (MALDI).

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume160
Issue number2
DOIs
Publication statusPublished - 2013
Externally publishedYes

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ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Abouimrane, A., Odom, S. A., Tavassol, H., Schulmerich, M. V., Wu, H., Bhargav, R., Gewirth, A. A., Moore, J. S., & Amine, K. (2013). 3-Hexylthiophene as a stabilizing additive for high voltage cathodes in lithium-ion batteries. Journal of the Electrochemical Society, 160(2). https://doi.org/10.1149/2.039302jes