Improvement of electrochemical performance of nickel rich LiNi0.6Co0.2Mn0.2O2 cathode active material by ultrathin TiO2 coating

CanCan Qin; JiaLi Cao; Jun Chen; GaoLe Dai; TongFu Wu; Yanbin Chen; YueFeng Tang; AiDong Li; Yanfeng Chen

doi:10.1039/C6DT01764A

Improvement of electrochemical performance of nickel rich LiNi_0.6Co_0.2Mn_0.2O₂ cathode active material by ultrathin TiO₂ coating

CanCan Qin,^a JiaLi Cao,^a Jun Chen,^a GaoLe Dai,^a TongFu Wu,^a Yanbin Chen,^b YueFeng Tang,*^a AiDong Li^a and Yanfeng Chen^a

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* Corresponding authors

^a National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu 210093, China
E-mail: yftang@nju.edu.cn

^b National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China

Abstract

LiNi_0.6Co_0.2Mn_0.2O₂ cathode material has been surface-modified by coating with ultrathin TiO₂via atomic layer deposition (ALD) technology to improve the electrochemical performance of LiNi_0.6Co_0.2Mn_0.2O₂ cathodes for lithium ion batteries. Within the cut-off voltage of 2.5–4.3 V, the coated sample delivers an initial discharge capacity of 187.7 mA h g⁻¹ at 0.1 C and with a capacity retention about 85.9% after 100 cycles at 1 C, which provides a significant improvement in terms of discharge capacity and cyclability, as compared with those of the bare one. Such enhanced electrochemical performance of the coated sample is ascribed to its high-quality ultrathin coating of amorphous TiO₂, which can protect the active material from HF attack, withstand the dissolution of metal ions in the electrode and favor the lithium diffusion of oxide as proved by electrochemical impedance spectroscopy (EIS) tests. TiO₂ coating via the ALD process provides a potential approach for battery factories to surface-modify Ni-rich electrode materials so as to realize improvements in electrochemical performance.

Article information

https://doi.org/10.1039/C6DT01764A

Article type

Paper

Submitted

05 May 2016

Accepted

11 May 2016

First published

25 May 2016

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Dalton Trans., 2016,45, 9669-9675

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Improvement of electrochemical performance of nickel rich LiNi_0.6Co_0.2Mn_0.2O₂ cathode active material by ultrathin TiO₂ coating

C. Qin, J. Cao, J. Chen, G. Dai, T. Wu, Y. Chen, Y. Tang, A. Li and Y. Chen, Dalton Trans., 2016, 45, 9669 DOI: 10.1039/C6DT01764A

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Dalton Transactions

Improvement of electrochemical performance of nickel rich LiNi_0.6Co_0.2Mn_0.2O₂ cathode active material by ultrathin TiO₂ coating

Abstract

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Improvement of electrochemical performance of nickel rich LiNi_0.6Co_0.2Mn_0.2O₂ cathode active material by ultrathin TiO₂ coating

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