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Role of Li2MnO3 Modification in Improving the Electrochemical Performance of Lithium-Rich Manganese-Based Oxide Electrodes
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-01-10 , DOI: 10.1021/acs.iecr.1c04348 Yang Li 1 , Jinlong Zhang 1 , Ruoyu Hong 1 , Ning Liu 2
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-01-10 , DOI: 10.1021/acs.iecr.1c04348 Yang Li 1 , Jinlong Zhang 1 , Ruoyu Hong 1 , Ning Liu 2
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Li-rich cathode materials have high specific capacities which exceed 250 mA h/g, but the arrangement of lithium inside them will cause the cations of transition metals to be mixed, resulting in the phase change and capacity loss in the charge and discharge cycle process. We propose surface modification by Li2MnO3, and its crystal structure is in consistence with the structure of lithium-rich manganese-based oxides, so that nickel ions can be orderly arranged between the transition metal layers during the cycle. We prepare Li1.2Mn0.54Ni0.13Co0.13O2 by the co-precipitation method and coat Li2MnO3 on its surface. This surface-modified structure will reduce the phase transition, inhibit the irreversible capacity loss, and improve the structural stability and cycle stability. The specific capacity of the pristine modified by 5 wt % Li2MnO3 is 224 mA h/g at 300 mA/g, and the capacity retention ratio is 96.2% after 100 cycles, while the unmodified pristine under the same conditions is only 197 mA h/g with its capacity retention ratio being 75.9%. In addition, the modified electrode showed better initial Coulombic efficiency, rate capacity, and impedance parameters.
中文翻译：
Li2MnO3 改性在提高富锂锰基氧化物电极电化学性能中的作用
富锂正极材料具有超过250 mAh/g的高比容量，但锂在其内部的排列会导致过渡金属的阳离子混合，导致充放电循环过程中的相变和容量损失. 我们提出通过Li 2 MnO 3进行表面改性，其晶体结构与富锂锰基氧化物的结构一致，使得镍离子在循环过程中可以在过渡金属层之间有序排列。我们采用共沉淀法制备Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2并包覆Li 2 MnO 3在它的表面上。这种表面改性结构将减少相变，抑制不可逆容量损失，提高结构稳定性和循环稳定性。5 wt% Li 2 MnO 3改性的pristine在300 mA/g时的比容量为224 mA h/g，循环100次后容量保持率为96.2%，而未改性的pristine在相同条件下仅为197 mA h/g，容量保持率为75.9%。此外，修饰电极表现出更好的初始库仑效率、倍率容量和阻抗参数。
更新日期：2022-01-19
中文翻译：
Li2MnO3 改性在提高富锂锰基氧化物电极电化学性能中的作用
富锂正极材料具有超过250 mAh/g的高比容量，但锂在其内部的排列会导致过渡金属的阳离子混合，导致充放电循环过程中的相变和容量损失. 我们提出通过Li 2 MnO 3进行表面改性，其晶体结构与富锂锰基氧化物的结构一致，使得镍离子在循环过程中可以在过渡金属层之间有序排列。我们采用共沉淀法制备Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2并包覆Li 2 MnO 3在它的表面上。这种表面改性结构将减少相变，抑制不可逆容量损失，提高结构稳定性和循环稳定性。5 wt% Li 2 MnO 3改性的pristine在300 mA/g时的比容量为224 mA h/g，循环100次后容量保持率为96.2%，而未改性的pristine在相同条件下仅为197 mA h/g，容量保持率为75.9%。此外，修饰电极表现出更好的初始库仑效率、倍率容量和阻抗参数。
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