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Journal of Nanomaterials
Volume 2018, Article ID 8082502, 9 pages
https://doi.org/10.1155/2018/8082502
Research Article

Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

1School of Environmental, Urban and Chemical Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju, Chungbuk 28644, Republic of Korea
2Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130022, China

Correspondence should be addressed to En Mei Jin; moc.revan@eijuk and Sang Mun Jeong; rk.ca.kubgnuhc@gnoejms

Received 25 September 2017; Revised 5 December 2017; Accepted 24 December 2017; Published 30 January 2018

Academic Editor: Bhanu P. Singh

Copyright © 2018 Dao Yong Wan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

NCA (LiNi0.85Co0.10Al0.05-x MxO2, M=Mn or Ti, < 0.01) cathode materials are prepared by a hydrothermal reaction at 170°C and doped with Mn and Ti to improve their electrochemical properties. The crystalline phases and morphologies of various NCA cathode materials are characterized by XRD, FE-SEM, and particle size distribution analysis. The CV, EIS, and galvanostatic charge/discharge test are employed to determine the electrochemical properties of the cathode materials. Mn and Ti doping resulted in cell volume expansion. This larger volume also improved the electrochemical properties of the cathode materials because Mn4+ and Ti4+ were introduced into the octahedral lattice space occupied by the Li-ions to expand the Li layer spacing and, thereby, improved the lithium diffusion kinetics. As a result, the NCA-Ti electrode exhibited superior performance with a high discharge capacity of 179.6 mAh g−1 after the first cycle, almost 23 mAh g−1 higher than that obtained with the undoped NCA electrode, and 166.7 mAh g−1 after 30 cycles. A good coulombic efficiency of 88.6% for the NCA-Ti electrode is observed based on calculations in the first charge and discharge capacities. In addition, the NCA-Ti cathode material exhibited the best cycling stability of 93% up to 30 cycles.