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Understanding the Role of Alumina (Al2O3), Pentalithium Aluminate (Li5AlO4), and Pentasodium Aluminate (Na5AlO4) Coatings on the Li and Mn‐Rich NCM Cathode Material 0.33Li2MnO3·0.67Li(Ni0.4Co0.2Mn0.4)O2 for Enhanced Electrochemical Performance
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-11-26 , DOI: 10.1002/adfm.202008083 Sandipan Maiti 1 , Hadar Sclar 1 , Rosy Sharma 1 , Noam Vishkin 1 , Miryam Fayena‐Greenstein 1 , Judith Grinblat 1 , Michael Talianker 2 , Larisa Burstein 3 , Nickolay Solomatin 4 , Ortal Tiurin 4 , Yair Ein‐Eli 4 , Malachi Noked 1 , Boris Markovsky 1 , Doron Aurbach 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-11-26 , DOI: 10.1002/adfm.202008083 Sandipan Maiti 1 , Hadar Sclar 1 , Rosy Sharma 1 , Noam Vishkin 1 , Miryam Fayena‐Greenstein 1 , Judith Grinblat 1 , Michael Talianker 2 , Larisa Burstein 3 , Nickolay Solomatin 4 , Ortal Tiurin 4 , Yair Ein‐Eli 4 , Malachi Noked 1 , Boris Markovsky 1 , Doron Aurbach 1
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The active role of alumina, pentalithium aluminate (Li5AlO4, Li‐aluminate), and pentasodium aluminate (Na5AlO4, Na‐aluminate) as the surface protection coatings produced via atomic layer deposition on Li and Mn‐rich NCM cathode materials 0.33Li2MnO3·0.67LiNi0.4Co0.2Mn0.4O2 is discussed. A notable improvement in the electrochemical behavior of the coated cathodes has been found while tested in Li‐coin cells at 30 °C. Though all the coated cathodes demonstrate enhanced electrochemical cycling and rate performances, Na‐aluminate coated cathodes exhibit exemplary behavior. Prolonged cycling and rate capability testing demonstrate that after more than 400 cycles at 1 C rate, the uncoated cathode delivers only 63 mAh g−1, while those with alumina, Li‐aluminate, and Na‐aluminate coatings exhibit approximately two times higher specific capacities. The coated cathodes display steady average discharge potential and lower evolution of the voltage hysteresis during prolonged cycling compared to the uncoated cathode. Importantly, Na‐aluminate coated cathode shows a lowering in gases (O2, CO2, H2, etc.) evolution. Post‐cycling analysis of the electrodes demonstrates higher morphological integrity of the coated cathode materials and lower transition metals dissolution from them. The coatings mitigate undesirable side reactions between the electrodes and the electrolyte solution in the cells.
中文翻译：
了解在富含Li和Mn的NCM阴极材料0.33Li2MnO3·0.67Li（Ni0.4Co0.2Mn0.4）O2上的氧化铝（Al2O3），铝酸五锂（Li5AlO4）和铝酸五钠（Na5AlO4）涂层对增强电化学的作用表现
氧化铝，铝酸五锂（Li 5 AlO 4，Li-铝酸盐）和铝酸五钠（Na 5 AlO 4，Na-铝酸盐）作为通过在Li和Mn富NCM阴极上进行原子层沉积而制得的表面保护涂层材料0.33Li 2 MnO 3 ·0.67LiNi 0.4 Co 0.2 Mn 0.4 O 2讨论。在30°C的锂硬币电池中进行测试时，发现涂层阴极的电化学行为有了显着改善。尽管所有涂覆的阴极均表现出增强的电化学循环和速率性能，但铝铝酸盐涂覆的阴极仍表现出良好的行为。长时间的循环和速率能力测试表明，在1 C速率下经过400次以上的循环后，未镀膜的阴极仅提供63 mAh g -1，而具有氧化铝，铝酸锂和铝酸铝涂层的阴极的比容量约高两倍。与未涂覆的阴极相比，涂覆的阴极在延长的循环过程中显示出稳定的平均放电电势和较低的电压滞后。重要的是，涂有铝铝酸盐的阴极显示出气体减少（O2，CO 2，H 2等）析出。电极的循环后分析表明，涂覆的阴极材料具有较高的形态完整性，而过渡金属从其中的溶解较低。涂层减轻了电极与电池中电解质溶液之间的不良副反应。
更新日期：2020-11-26
中文翻译：
了解在富含Li和Mn的NCM阴极材料0.33Li2MnO3·0.67Li（Ni0.4Co0.2Mn0.4）O2上的氧化铝（Al2O3），铝酸五锂（Li5AlO4）和铝酸五钠（Na5AlO4）涂层对增强电化学的作用表现
氧化铝，铝酸五锂（Li 5 AlO 4，Li-铝酸盐）和铝酸五钠（Na 5 AlO 4，Na-铝酸盐）作为通过在Li和Mn富NCM阴极上进行原子层沉积而制得的表面保护涂层材料0.33Li 2 MnO 3 ·0.67LiNi 0.4 Co 0.2 Mn 0.4 O 2讨论。在30°C的锂硬币电池中进行测试时，发现涂层阴极的电化学行为有了显着改善。尽管所有涂覆的阴极均表现出增强的电化学循环和速率性能，但铝铝酸盐涂覆的阴极仍表现出良好的行为。长时间的循环和速率能力测试表明，在1 C速率下经过400次以上的循环后，未镀膜的阴极仅提供63 mAh g -1，而具有氧化铝，铝酸锂和铝酸铝涂层的阴极的比容量约高两倍。与未涂覆的阴极相比，涂覆的阴极在延长的循环过程中显示出稳定的平均放电电势和较低的电压滞后。重要的是，涂有铝铝酸盐的阴极显示出气体减少（O2，CO 2，H 2等）析出。电极的循环后分析表明，涂覆的阴极材料具有较高的形态完整性，而过渡金属从其中的溶解较低。涂层减轻了电极与电池中电解质溶液之间的不良副反应。
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