Improved Lithium Ion Diffusion and Stability of a LiNi0.8Co0.1Mn0.1O2 Cathode via the Synergistic Effect of Na and Mg Dual-Metal Cations for Lithium Ion Battery
Improved Lithium Ion Diffusion and Stability of a LiNi0.8Co0.1Mn0.1O2 Cathode via the Synergistic Effect of Na and Mg Dual-Metal Cations for Lithium Ion Battery
复制标题
DOI：
10.1149/1945-7111/ab6977
复制
发表时间：
2020-01
影响因子：
3.9
通讯作者：
Sun Yanxia;Hai Chunxi;Shen Yue;Zeng Jinbo;Zhang Lijuan;L. Xiang;Ren Xiufeng;Dong Shengde
中科院分区：
文献类型：
--
作者：
Sun Yanxia;Hai Chunxi;Shen Yue;Zeng Jinbo;Zhang Lijuan;L. Xiang;Ren Xiufeng;Dong Shengde
富镍三元材料LiNi0.8Co0.1Mn0.1O2是很有前途的锂离子电池正极材料，但其结构不稳定的缺点。修饰其电化学性能的常用方法是元素掺杂，如钠、铝、镁等元素，因为不同类型和价的元素具有不同的离子半径和对氧的结合能。它们被整合到层状富镍三元材料中，以发挥不同的作用。本文研究了Na和Mg共掺杂对Li(Ni0.8Co0.1Mn0.1)O2的影响。我们的研究结果表明，混合掺杂对材料的晶体结构和形貌没有影响。Rietveld细化结果表明，阳离子混合减少。电化学测试结果表明，适量的Na和Mg混合掺杂提高了材料的循环可逆性，降低了材料的电阻。Na和Mg元素可以相互促进，提高材料的电化学性能。同时，我们注意到高掺杂浓度可能会减缓Li的扩散速率。
Nickel-rich ternary material LiNi0.8Co0.1Mn0.1O2 is the promising cathode for lithium ion battery, but it has the disadvantage of structural instability. The common method for modifying its electrochemical performance is element doping, such as sodium, aluminum, magnesium and other elements, because the elements with different types and valences have varied ionic radii and binding energies to oxygen. They are incorporated into the layered nickel-rich ternary material to play the distinct roles. In this work, we investigate the effect of Na and Mg co-doping on Li(Ni0.8Co0.1Mn0.1)O2. Our results suggest that the mixed doping has no effect on the crystal structure and morphology of the material. The Rietveld refinement results demonstrated that cation mixing reduced. The electrochemical test results show that the proper amount of Na and Mg mixed doping improves the cyclic reversibility and reduces the resistance of the material. Na and Mg elements can promote each other to improve the electrochemical performance of the material. At the same time we note that high doping concentrations might mitigate the Li diffusion rates.