Issue 14, 2019, Issue in Progress

TiO2-coated LiCoO2 electrodes fabricated by a sputtering deposition method for lithium-ion batteries with enhanced electrochemical performance

Abstract

We fabricated lithium cobalt oxide (LiCoO2, LCO) electrodes in the absence and presence of TiO2 layers as cathodes for lithium-ion batteries (LIBs) using a sputtering deposition method under an Ar atmosphere. In particular, TiO2 coating layers on sputtered LCO electrodes were directly deposited in a layer-by-layer form with varying TiO2 sputtering times from 60 to 120 s. These sputtered electrodes were heated at 600 °C in an air atmosphere for 3 h. The thicknesses of TiO2 layers in TiO2-coated LCO electrodes were controlled from ∼2 to ∼10 nm. These TiO2-coated LCO electrodes exhibited superior electrochemical performance, i.e. high capacities (93–107 mA h g−1@0.5C), improved retention of >60% after 100 cycles, and high-rate cycling properties (64 mA h g−1@1C after 100 cycles). Such an improved performance of TiO2-coated LCO electrodes was found to be attributed to relieved volumetric expansion of LCO and protection of LCO electrodes against HF generated during cycling.

Graphical abstract: TiO2-coated LiCoO2 electrodes fabricated by a sputtering deposition method for lithium-ion batteries with enhanced electrochemical performance

Supplementary files

Article information

Article type
Paper
Submitted
20 Dec 2018
Accepted
04 Mar 2019
First published
11 Mar 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 7903-7907

TiO2-coated LiCoO2 electrodes fabricated by a sputtering deposition method for lithium-ion batteries with enhanced electrochemical performance

S. Moon, M. Kim, E. Kim, Y. Shin, J. Lee, S. Choi and K. Park, RSC Adv., 2019, 9, 7903 DOI: 10.1039/C8RA10451D

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