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| Preparation and Electrochemical Performance of LiNi0.5Mn0.5-xCoxO2(0≤x≤0.12) Cathode Materials |
Shengwen ZHONG1( ), Huajun ZHANG1, Wenli YAO1,2(), Qian ZHANG1, Yukun FU1, Xiaodong TANG1 |
1 Jiangxi Key Laboratory of Power Battery and Material, School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2 Jiangxi Reserach Institue of Tungsten and Rare Earths, Ganzhou 341000, China |
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Cite this article:
Shengwen ZHONG, Huajun ZHANG, Wenli YAO, Qian ZHANG, Yukun FU, Xiaodong TANG. Preparation and Electrochemical Performance of LiNi0.5Mn0.5-xCoxO2(0≤x≤0.12) Cathode Materials. Chinese Journal of Materials Research, 2018, 32(7): 487-494.
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Abstract Cathode materials of LiNi0.5Mn0.5-xCoxO2(0<x≤0.12) were synthesized via simple co-precipitation and high-temperature solid-state reaction processes. The prepared materials were characterized by SEM, XRD, EDS and XPS. Their electrochemical performance was examined by galvanostatic charge-discharge tests, electrochemical impedance spectroscopy. Results show that all of the doped samples have a typical α-NaFeO2 layered structure with partial substitution of Co-atom for Mn-atom in the crystal lattice. XPS analysis showed that there is oxygen deficiency in the doped materials and the valence states of Ni, Mn and Co were mainly +2, +4 and +3, respectively. It has been found that the Co-doped LiNi0.5Mn0.5O2 shows better cycling stability, rate capacity and low-temperature property than LiNi0.5Mn0.5O2 without Co doping. For cycled at 25oC in the voltage range of 2.75~4.35 V, the LiNi0.5Mn0.5-xCo0.12O2 delivered initial discharge specific capacity of 180.8 mAh·g-1 and kept capacity retention rate of 92.3% after 100 cycles. The discharge specific capacity for the corresponding electrode cycled at -20oC is about 66.3% of its initial discharge specific capacity cycled at 25oC.
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Received: 04 November 2017
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| Fund: Supported by the National Natural Science Foundation of China (No. 51372104), Education Bureau of Jiangxi Province (No. GJJ160601), Doctoral Scientific Research Foundation of Jiangxi University of Science and Technology (No. jxxjbs16025), Finance and Education Plan of Ganzhou City (No. 197[2017]) and External Technological Cooperation of Jiangxi Province (No. 20123BDH80016) |
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