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Enhancement of Structural, Electrochemical, and Thermal Properties of Ni‐Rich LiNi0.85Co0.1Mn0.05O2 Cathode Materials for Li‐Ion Batteries by Al and Ti Doping
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-09-12 , DOI: 10.1002/batt.202000191 Yehonatan Levartovsky 1 , Xiaohan Wu 2 , Christoph Erk 2 , Sandipan Maiti 1 , Judith Grinblat 1 , Michael Talianker 1 , Doron Aurbach 3
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-09-12 , DOI: 10.1002/batt.202000191 Yehonatan Levartovsky 1 , Xiaohan Wu 2 , Christoph Erk 2 , Sandipan Maiti 1 , Judith Grinblat 1 , Michael Talianker 1 , Doron Aurbach 3
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Ni‐rich layered oxides LiNi1‐x‐yCoxMnyO2 (1−x−y>0.5) are promising cathode materials for the new generation of Li‐ion batteries suitable for electro‐mobility due to their high energy density, good rate capability, and relatively low cost. However, their main drawback is poor cycling performance, particularly at elevated temperatures. In this research, it is demonstrated how doping with Al and Ti, using straightforward solid‐state mixing synthesis, can dramatically enhance the structural, electrochemical, and thermal properties of LiNi0.85Co0.1Mn0.05O2 (NCM85). The capacity retention of Al‐doped and Ti‐doped cathodes after 100 cycles at 100 % DOD at 1 C and 45 °C using standard electrolyte solutions could reach nearly 99 % and 78 %, respectively, while the capacity retention of the undoped material was less than 74 % in similar experiments. Doping with Al and Ti facilitates the Li intercalation processes and reduces voltage hysteresis. Structural study of the cycled cathodes shows that doping with Al, and to a smaller extent with Ti, reduces the formation of cracks in the particles of the cathode materials upon cycling, consequently reducing degradation. Thermal studies show that doping with Al or Ti improves the thermal stability of these cathode materials. Highly interesting is the correlation between the morphology and thermal stability, impedance properties and the electrochemical characteristics as a function of doping.
中文翻译：
Al和Ti掺杂增强富Ni的LiNi0.85Co0.1Mn0.05O2锂离子电池正极材料的结构，电化学和热性能
富镍层状氧化物LiNi 1- x - y Co x Mn y O 2（1- x - y > 0.5）具有高能量密度，是适用于电动汽车的新一代锂离子电池的有希望的正极材料，良好的计费能力和相对较低的成本。但是，它们的主要缺点是循环性能差，特别是在高温下。在这项研究中，证明了使用简单的固态混合合成掺杂Al和Ti可以如何显着增强LiNi 0.85 Co 0.1 Mn 0.05 O 2的结构，电化学和热性能。（NCM85）。使用标准电解质溶液在1 C和45°C下在100％DOD下进行100次DOD掺杂后，Al掺杂和Ti掺杂的阴极的容量保持率可以分别达到近99％和78％，而未掺杂材料的容量保持率则为在类似的实验中不到74％。掺杂Al和Ti有助于Li嵌入过程并降低电压滞后。对循环阴极的结构研究表明，掺杂Al并在较小程度上掺杂Ti可以减少循环时阴极材料颗粒中裂纹的形成，从而减少降解。热学研究表明，掺杂Al或Ti可以改善这些阴极材料的热稳定性。有趣的是形态与热稳定性之间的关系，
更新日期：2020-09-12
中文翻译：
Al和Ti掺杂增强富Ni的LiNi0.85Co0.1Mn0.05O2锂离子电池正极材料的结构，电化学和热性能
富镍层状氧化物LiNi 1- x - y Co x Mn y O 2（1- x - y > 0.5）具有高能量密度，是适用于电动汽车的新一代锂离子电池的有希望的正极材料，良好的计费能力和相对较低的成本。但是，它们的主要缺点是循环性能差，特别是在高温下。在这项研究中，证明了使用简单的固态混合合成掺杂Al和Ti可以如何显着增强LiNi 0.85 Co 0.1 Mn 0.05 O 2的结构，电化学和热性能。（NCM85）。使用标准电解质溶液在1 C和45°C下在100％DOD下进行100次DOD掺杂后，Al掺杂和Ti掺杂的阴极的容量保持率可以分别达到近99％和78％，而未掺杂材料的容量保持率则为在类似的实验中不到74％。掺杂Al和Ti有助于Li嵌入过程并降低电压滞后。对循环阴极的结构研究表明，掺杂Al并在较小程度上掺杂Ti可以减少循环时阴极材料颗粒中裂纹的形成，从而减少降解。热学研究表明，掺杂Al或Ti可以改善这些阴极材料的热稳定性。有趣的是形态与热稳定性之间的关系，
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