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Article

Enhanced Structural Stability and Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 Cathode Materials by Ga Doping

by 1, 1,*,†, 1, 2,*,†, 3, 1, 1 and 2,*,†
1
Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, School of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
2
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
3
Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Federico Bella
Materials 2021, 14(8), 1816; https://doi.org/10.3390/ma14081816
Received: 23 February 2021 / Revised: 27 March 2021 / Accepted: 30 March 2021 / Published: 7 April 2021
(This article belongs to the Section Energy Materials)
Structural instability during cycling is an important factor affecting the electrochemical performance of nickel-rich ternary cathode materials for Li-ion batteries. In this work, enhanced structural stability and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials are achieved by Ga doping. Compared with the pristine electrode, Li[Ni0.6Co0.2Mn0.2]0.98Ga0.02O2 electrode exhibits remarkably improved electrochemical performance and thermal safety. At 0.5C rate, the discharge capacity increases from 169.3 mAh g−1 to 177 mAh g−1, and the capacity retention also rises from 82.8% to 89.8% after 50 cycles. In the charged state of 4.3 V, its exothermic temperature increases from 245.13 °C to more than 271.24 °C, and the total exothermic heat decreases from 561.7 to 225.6 J·g−1. Both AC impedance spectroscopy and in situ XRD analysis confirmed that Ga doping can improve the stability of the electrode/electrolyte interface structure and bulk structure during cycling, which helps to improve the electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material. View Full-Text
Keywords: lithium ion batteries; cathode material; LiNi0.6Co0.2Mn0.2O2; Ga doping; structural stability lithium ion batteries; cathode material; LiNi0.6Co0.2Mn0.2O2; Ga doping; structural stability
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MDPI and ACS Style

Liu, Z.; Li, J.; Zhu, M.; Wang, L.; Kang, Y.; Dang, Z.; Yan, J.; He, X. Enhanced Structural Stability and Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 Cathode Materials by Ga Doping. Materials 2021, 14, 1816. https://doi.org/10.3390/ma14081816

AMA Style

Liu Z, Li J, Zhu M, Wang L, Kang Y, Dang Z, Yan J, He X. Enhanced Structural Stability and Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 Cathode Materials by Ga Doping. Materials. 2021; 14(8):1816. https://doi.org/10.3390/ma14081816

Chicago/Turabian Style

Liu, Zhibei, Jiangang Li, Meijie Zhu, Li Wang, Yuqiong Kang, Zhaohan Dang, Jiasen Yan, and Xiangming He. 2021. "Enhanced Structural Stability and Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 Cathode Materials by Ga Doping" Materials 14, no. 8: 1816. https://doi.org/10.3390/ma14081816

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