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Ultrathin ZrO 2 on LiNi 0.5 Mn 0.3 Co 0.2 O 2 electrode surface via atomic layer deposition for high-voltage operation in lithium-ion batteries
- Ultrathin ZrO 2 on LiNi 0.5 Mn 0.3 Co 0.2 O 2 electrode surface via atomic layer deposition for high-voltage operation in lithium-ion batteries
- Ahn, Jinhyeok; Jang, Eun Kwang; Yoon, Sukeun; Lee, Sang-Ju; Sung, Shi-Joon; Kim, Dae-Hwan; Cho, Kuk Young
- DGIST Authors
- Sung, Shi-Joon; Kim, Dae-Hwan
- Issue Date
- Applied Surface Science, 484, 701-709
- Article Type
- Author Keyword
- Atomic layer deposition; High-voltage operation; LiNi 0.5 Mn 0.3 Co 0.2 O 2; Prepared electrode; Surface coating; ZrO 2
- Atoms; Cathodes; Coatings; Cobalt compounds; Cyclic voltammetry; Electric discharges; Electrochemical electrodes; Electrolytes; Lithium compounds; Manganese compounds; Nickel compounds; X ray diffraction analysis; X ray photoelectron spectroscopy; Zirconia; Charge discharge cycling; Electrochemical performance; Electrolyte decomposition; High-voltage operation; LiNi0.5Mn0.3Co0.2O2; Structural disordering; Surface coatings; ZrO2; Lithium-ion batteries
- High-voltage operation in LiNi 0.5 Mn 0.3 Co 0.2 O 2 (NMC532) is an attractive strategy to meet the demands for practical application of high energy density lithium-ion batteries (LIBs). However, a serious problem at high cut-off voltage is the capacity fading during charge-discharge cycling, caused by electrolyte decomposition and dissolution of cathode materials. Herein, we fabricated an ultrathin ZrO 2 coating on the surface of the as-prepared NMC532 electrode via atomic layer deposition (ALD) to improve the electrochemical performances of the high-voltage NMC532/graphite system. The capacity retention and rate capability of NMC 532 electrode at high voltage (4.6 V) operation were improved by the ZrO 2 coating. Cyclic voltammetry, X-ray photoelectron spectroscopy, and X-ray diffraction analyses of ZrO 2 -coated NMC532 electrode revealed that the enhanced electrochemical performance was due to the reduced side reaction, structural disordering, and polarization at the cathode surface. Thus, ZrO 2 coating of the as-prepared electrode by ALD is a promising technique to maintain the high electrochemical performance of LIBs during high-voltage operations. © 2019 Elsevier B.V.
- Elsevier BV
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