The effects of radio frequency sputtering of TiO2 on Li[Li0.07Ni0.38Co0.15Mn0.4]O2 Cathode for Lithium Ion Batteries

Jung Joon Kim, Taeho Yoon, Kyung Jae Lee, Seung Ho Yu, Seung Mo Oh, Yung Eun Sung

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A radio frequency (RF) sputtering system is used to coat nano-thick TiO2 layer on the overlithiated layered metal oxide (OLO) electrode. The X-ray diffraction (XRD) and the field emission-scanning electron microscope (FE-SEM) images indicate amorphous TiO2 is coated on the top surface of the electrode with a thickness of ∼20 nm for the 40 min sputtered sample. The sample sputtered for 40 minutes cycled at 90 mA g?1 between 2 and 4.8 V versus Li+/Li has 15 mA h g?1 more specific capacity at 100th cycle than that of the uncoated sample. In the voltage profiles, additional overpotential is unobservable upon sputtering TiO2 in comparison to that of the reference sample. Further analyses by the electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) demonstrate the sputtered sample has less electrolyte decomposition products on the surface than that of the reference sample. Moreover, in the case of sputtering, reduced amount of transition metal and Li2O are deposited on the surface of the counter electrode, Li. In summary, the sputtered TiO2 acts as nano-sized artificial solid electrolyte interface (SEI) layer, which protects the surface of the electrode and improves kinetic properties, leading to improved performance.

Original languageEnglish
Pages (from-to)7924-7931
Number of pages8
JournalJournal of Nanoscience and Nanotechnology
Volume13
Issue number12
DOIs
Publication statusPublished - 2013 Dec

Keywords

  • Coating
  • Lithium Ion Batteries
  • Sputtering
  • Surface Treatment.
  • Titanium Oxide

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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