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Pr doped single-crystal LiNi0.5Mn0.3Co0.2O2 cathode enables high rate capability and cycle stability for lithium ion batteries
Journal of Materiomics ( IF 9.4 ) Pub Date : 2022-09-20 , DOI: 10.1016/j.jmat.2022.09.001
Xiaopei Zhu , Han Yu , Lina Cheng , Feifei Xu , Zilu Wang , Li-Zhen Fan

The massive application of single crystal (SC) ternary cathode material LiNi1-x-yMnxCoyO2 is largely restricted by the unsatisfactory rate capability which is caused by the sluggish Li+ diffusion and structural instability. Herein, Pr3+, a large radius ion is introduced to single-crystal LiNi0.5Mn0.3Co0.2O2 to enhance Li + conductivity and structural stability. With 0.4% Pr doping, the Li(Ni0.5Mn0.3Co0.2)0.996Pr0.004O2 cathode displays a capacity retention of 79.72% at 10 C, and a 98.17% capacity retention after 50 cycles at 25 °C and 96.3% capacity retention after 50 cycles at 55 °C within a 3.0–4.5 V voltage window. Electrochemical impedance spectroscopy confirms that the Pr doping can effectively lower the charge-transfer resistance and facilitate the transportation of Li+ on the surface of LiNi0.5Mn0.3Co0.2O2. The Direct current internal resistance result implies that the structure of the Pr-doped cathode particles is more stable during cycling. In addition, differential scanning calorimetry measurements measurement combined with in situ X-ray diffraction confirms the thermo-stabilization effect of the Pr dopant.



中文翻译:

镨掺杂单晶 LiNi0.5Mn0.3Co0.2O2 正极使锂离子电池具有高倍率性能和循环稳定性

单晶(SC)三元正极材料LiNi 1- x - y Mn x Co y O 2的大量应用受到Li + 扩散缓慢和结构不稳定导致的倍率性能不理想的制约。在此,将大半径离子Pr 3+引入单晶LiNi 0.5 Mn 0.3 Co 0.2 O 2以增强Li  + 电导率和结构稳定性。掺杂0.4% Pr, Li(Ni 0.5 Mn 0.3 Co 0.2 ) 0.996 Pr0.004 O 2正极在 10 C 时的容量保持率为 79.72%,在 25 °C 下循环 50 次后容量保持率为 98.17%,在 3.0–4.5 V 电压窗口内在 55 °C 下循环 50 次后容量保持率为 96.3%。电化学阻抗谱证实,Pr掺杂可有效降低电荷转移电阻,促进Li + 在LiNi 0.5 Mn 0.3 Co 0.2 O 2表面的传输. 直流内阻结果表明 Pr 掺杂正极颗粒的结构在循环过程中更加稳定。此外,差示扫描量热法测量结合原位 X 射线衍射证实了 Pr 掺杂剂的热稳定作用。

更新日期:2022-09-20
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