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 1
Externally publishedYes

Fingerprint

Radio
Lithium
Sputtering
electric batteries
radio frequencies
Electrodes
Cathodes
lithium
cathodes
sputtering
Ions
Electrolytes
ions
electrodes
Metals
Dielectric Spectroscopy
Photoelectron Spectroscopy
Solid electrolytes
Electrochemical impedance spectroscopy
X-Ray Diffraction

Keywords

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

ASJC Scopus subject areas

  • Medicine(all)

Cite this

The effects of radio frequency sputtering of TiO2 on Li[Li0.07Ni0.38Co0.15Mn0.4]O2 Cathode for Lithium Ion Batteries. / Kim, Jung Joon; Yoon, Taeho; Lee, Kyung Jae; Yu, Seung-Ho; Oh, Seung Mo; Sung, Yung Eun.

In: Journal of Nanoscience and Nanotechnology, Vol. 13, No. 12, 01.12.2013, p. 7924-7931.

Research output: Contribution to journalArticle

Kim, Jung Joon ; Yoon, Taeho ; Lee, Kyung Jae ; Yu, Seung-Ho ; Oh, Seung Mo ; Sung, Yung Eun. / The effects of radio frequency sputtering of TiO2 on Li[Li0.07Ni0.38Co0.15Mn0.4]O2 Cathode for Lithium Ion Batteries. In: Journal of Nanoscience and Nanotechnology. 2013 ; Vol. 13, No. 12. pp. 7924-7931.
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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.",
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