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Electrochemical and lithium-ion transport properties of layered Li-rich Li1.10(Ni0.32X0.01Co0.33Mn0.33)O2 (X = Dy/Gd/Ho) positive electrodes
Indian Journal of Pure & Applied Physics ( IF 0.7 ) Pub Date : 2020-11-25
P Senthil Kumar, A Sakunthala, M V Reddy, R Prasada Rao, B V R Chowdari, S Adams

Layer structured Li1.10(Ni0.32X0.01Co0.33Mn0.33)O2 (X = Dy/Gd/Ho) compounds were synthesized via the microwave assisted solvothermal route. The impacts of doping on the electrical and electrochemical properties of Li1.10 (Ni0.32X0.01Co0.33Mn0.33)O2 compounds were investigated. Rietveld refined XRD pattern showed Li1.10 (Ni0.32X0.01Co0.33Mn0.33)O2 compounds with layered hexagonal structure. SEM images revealed the compounds with micrometer sized grains. The Li1.10 (Ni0.33Co0.33Mn0.33)O2 compound delivered an initial discharge capacity of 197 mAh/g at 0.2C and retained a capacity of 163mAh/g after 50th cycle in the voltage window of 2.5-4.6V. The cycling stability of Li1.10(Ni0.33Co0.33Mn0.33)O2 compound was improved with rare earth doping. Li1.10(Ni0.32Dy0.01Co0.33Mn0.33)O2 compound delivered the discharge capacity of 166 mAh/g after50th cycle in the potential window 2.5-4.6V at 0.2C with 100% capacity retention. AC impedance studies displayed the electrical conductivity in the order of 10-6 S/cm. Wagner polarization analysis revealed the improvement in electronic transference number via rare earth doping.

中文翻译:

层状富Li1.10(Ni0.32X0.01Co0.33Mn0.33)O2(X = Dy / Gd / Ho)正极的电化学和锂离子传输性能

通过微波辅助溶剂热法合成了层状的Li 1.10(Ni 0.32 X 0.01 Co 0.33 Mn 0.33)O 2(X = Dy / Gd / Ho)化合物。研究了掺杂对Li 1.10(Ni 0.32 X 0.01 Co 0.33 Mn 0.33)O 2化合物的电和电化学性能的影响。Rietveld精制的XRD图谱显示Li 1.10(Ni 0.32 X 0.01 Co 0.33 Mn 0.33)O 2具有分层六边形结构的化合物。SEM图像显示出具有微米级晶粒的化合物。Li 1.10(Ni 0.33 Co 0.33 Mn 0.33)O 2化合物在0.2C下的初始放电容量为197 mAh / g,并且在2.5-4.6V的电压窗口中经过50循环后仍保持163mAh / g的容量。稀土掺杂改善了Li 1.10(Ni 0.33 Co 0.33 Mn 0.33)O 2化合物的循环稳定性。Li 1.10(Ni 0.32 Dy 0.01 Co 0.33 Mn 0.33O 2化合物在第50循环后于0.2-C的电位窗口2.5-4.6V中以166 mAh / g的放电容量保持100%的容量。交流阻抗研究显示的电导率为10 -6 S / cm。瓦格纳极化分析表明,通过稀土掺杂可以改善电子转移数。
更新日期:2020-11-25
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