Preparation and Electrochemical Performance of Mg-Doped LiNi_0.4Co_0.2Mn_0.4O₂ Cathode Materials by Urea Co-Precipitation

Abstract:

The Mg-doped LiNi0.4Co0.2-xMn0.4MgxO2 cathode materials (x=0, 0.01, 0.02 and 0.03) were synthesized by a urea co-precipitation method. Its structure and electrochemical properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and electrochemical performance tests. XRD studies indicate that the Mg-doped LiNi0.4Co0.2Mn0.4O2 samples perform the same layered structure as the undoped LiNi0.4Co0.2Mn0.4O2. SEM images show that the particle size of Mg-doped LiNi0.4Co0.2Mn0.4O2 is smaller than the undoped LiNi0.4Co0.2Mn0.4O2 sample. Charge-discharge tests confirm that the rate capacity and cycling performance of LiNi0.4Co0.2-xMn0.4MgxO2 are improved by Mg-doped. The optimal doping content of Mg is x=0.02 in the LiNi0.4Co0.2-xMn0.4MgxO2 samples, which can achieve high initial charge-discharge capacity and good cyclic stability. The electrode reaction reversibility was enhanced, and the charge transfer resistance was decreased through the Mg-doping. The improved electrochemical performances of the Mg-doped LiNi0.4Co0.2Mn0.4O2 cathode materials are attributed to the addition of Mg2+ ion by stabilizing the layered structure.

• Periodical: Key Engineering Materials (Volume 519)
• Pages: 152-155
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.519.152
• Online since: July 2012
• Authors: Qian Zhang, Yan Sheng Zheng, Sheng Kui Zhong
• Keywords: LiNi_0.4Co_0.2Mn_0.4O₂, Lithium-Ion Battery, Mg-Doped, Urea Co-Precipitation

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