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The Improved Interfacial and Thermal Stability of Nickel-Rich LiNi0.85Co0.10Mn0.05O2 Cathode in Li-Ion Battery via Perovskite La4NiLiO8 Coating
ChemNanoMat ( IF 2.6 ) Pub Date : 2021-04-15 , DOI: 10.1002/cnma.202100168 Guang Wang 1 , bo zhao 2 , zhenyi gu 2 , yunfeng meng 2 , xinglong wu 2
ChemNanoMat ( IF 2.6 ) Pub Date : 2021-04-15 , DOI: 10.1002/cnma.202100168 Guang Wang 1 , bo zhao 2 , zhenyi gu 2 , yunfeng meng 2 , xinglong wu 2
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Capacity attenuation caused by Ni dissolution and interface instability during cycling is a major challenge because it limits the application of high Ni ternary cathode materials in Li-ion batteries. In this paper, ternary LiNi0.85Co0.10Mn0.05O2 cathode with high nickel content was prepared by co-precipitation method, and then was coated with perovskite La4NiLiO8 via the simple thermochemical method. The analysis of the images of transmission electron microscope (TEM) showed that the coating is uniformly covered on the surface of NCM85 material with a thickness of 5 nm. Compared to uncoated sample, the La4NiLiO8-coated LiNi0.85Co0.10Mn0.05O2 material shows lower electrochemical impedance and better cyclic stability, the initial kinetic diffusion coefficient and the interface stability of the prepared material are greatly improved. Meanwhile, the problems of Li+/Ni2+ mixing are also been solved. This work provides a new strategy for improving the interface and thermal stability of the nickel cathode material of Li-ion battery in the future.
中文翻译：
通过钙钛矿La4NiLiO8涂层改善锂离子电池中富镍LiNi0.85Co0.10Mn0.05O2正极的界面和热稳定性
循环过程中由镍溶解和界面不稳定引起的容量衰减是一个主要挑战，因为它限制了高镍三元正极材料在锂离子电池中的应用。本文采用共沉淀法制备了高镍含量的三元LiNi 0.85 Co 0.10 Mn 0.05 O 2正极，然后通过简单的热化学方法包覆钙钛矿La 4 NiLiO 8。透射电子显微镜（TEM）图像分析表明，涂层均匀覆盖在NCM85材料表面，厚度为5nm。与未涂覆的样品相比，La 4 NiLiO 8涂覆的 LiNi0.85 Co 0.10 Mn 0.05 O 2材料表现出更低的电化学阻抗和更好的循环稳定性，所制备材料的初始动力学扩散系数和界面稳定性都有很大提高。同时，也解决了Li + /Ni 2+混合问题。该工作为未来改善锂离子电池镍正极材料的界面和热稳定性提供了新的策略。
更新日期：2021-06-05
中文翻译：
通过钙钛矿La4NiLiO8涂层改善锂离子电池中富镍LiNi0.85Co0.10Mn0.05O2正极的界面和热稳定性
循环过程中由镍溶解和界面不稳定引起的容量衰减是一个主要挑战，因为它限制了高镍三元正极材料在锂离子电池中的应用。本文采用共沉淀法制备了高镍含量的三元LiNi 0.85 Co 0.10 Mn 0.05 O 2正极，然后通过简单的热化学方法包覆钙钛矿La 4 NiLiO 8。透射电子显微镜（TEM）图像分析表明，涂层均匀覆盖在NCM85材料表面，厚度为5nm。与未涂覆的样品相比，La 4 NiLiO 8涂覆的 LiNi0.85 Co 0.10 Mn 0.05 O 2材料表现出更低的电化学阻抗和更好的循环稳定性，所制备材料的初始动力学扩散系数和界面稳定性都有很大提高。同时，也解决了Li + /Ni 2+混合问题。该工作为未来改善锂离子电池镍正极材料的界面和热稳定性提供了新的策略。
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