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Stabilized Behavior of LiNi0.85Co0.10Mn0.05O2 Cathode Materials Induced by Their Treatment with SO2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-17 00:00:00 , DOI: 10.1021/acsaem.0c00098 Francis Amalraj Susai 1 , Hadar Sclar 1 , Sandipan Maiti 1 , Larisa Burstein 2 , Ortal Perkal 1 , Judith Grinblat 1 , Michael Talianker 3 , Sharon Ruthstein 1 , Christoph Erk 4 , Pascal Hartmann 4 , Boris Markovsky 1 , Doron Aurbach 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-17 00:00:00 , DOI: 10.1021/acsaem.0c00098 Francis Amalraj Susai 1 , Hadar Sclar 1 , Sandipan Maiti 1 , Larisa Burstein 2 , Ortal Perkal 1 , Judith Grinblat 1 , Michael Talianker 3 , Sharon Ruthstein 1 , Christoph Erk 4 , Pascal Hartmann 4 , Boris Markovsky 1 , Doron Aurbach 1
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We present in this paper a modification and stabilization approach for the surface of a high specific capacity Ni-rich cathode material LiNi0.85Co0.10Mn0.05O2 (NCM85) via SO2 gas treatment at 250–400 °C, in order to enhance its electrochemical performance in advanced lithium-ion batteries. It was established that SO2 interactions with NCM85 result in the formation of a nanometer-sized Li2SO4 surface layer on the oxide particles with no impact on the bulk structure of the material and its morphology. We consider the above interactions as oxidation–reduction processes resulting in direct oxidation of sulfur and partial reduction of Ni3+ as revealed by high-resolution XPS and electron paramagnetic resonance studies. The important impacts of the SO2 treatment are a remarkably stable cycling performance of cathodes comprising this material with ∼10% increase in capacity retention and lesser voltage hysteresis upon cycling compared to untreated NCM85 cathodes. The SO2-treated NCM85 material is also significantly thermally stable, demonstrating lower heat evolution upon thermal reactions with standard EC-EMC/LiPF6 solutions by 12–20%, compared to untreated material. The proposed approach to modify the surface of Ni-rich NCM cathode materials by SO2 treatment is demonstrated to be a promising method to enhance their electrochemical performance. This work demonstrates a leap in performance of Ni-rich NCM cathode materials by increasing the content of nickel compared to any benchmark cathodes and is a promising approach for stabilization by surface modification.
中文翻译：
SO 2处理诱导LiNi 0.85 Co 0.10 Mn 0.05 O 2正极材料的稳定行为
我们在本文中提出了一种在250–400°C下通过SO 2气体处理对高比容量富镍阴极材料LiNi 0.85 Co 0.10 Mn 0.05 O 2（NCM85）进行改性和稳定化的方法，其在高级锂离子电池中的电化学性能。已确定SO 2与NCM85的相互作用导致形成纳米级Li 2 SO 4氧化物颗粒上的表面层对材料的整体结构及其形态没有影响。如高分辨率XPS和电子顺磁共振研究所揭示的，我们将上述相互作用视为氧化还原过程，导致硫的直接氧化和Ni 3+的部分还原。SO 2处理的重要影响是与未处理的NCM85阴极相比，包含该材料的阴极具有显着稳定的循环性能，循环时容量保持率提高了约10％，电压滞后降低。经SO 2处理的NCM85材料还具有显着的热稳定性，表明与标准EC-EMC / LiPF 6发生热反应时产生的热量较低。与未处理的材料相比，溶液的溶解度提高了12–20％。通过SO 2处理改性富镍NCM阴极材料表面的方法被证明是增强其电化学性能的一种有前途的方法。这项工作通过增加镍的含量（与任何基准阴极相比），证明了富镍NCM阴极材料在性能上的飞跃，并且是通过表面改性来稳定化的一种有前途的方法。
更新日期：2020-03-17
中文翻译：
SO 2处理诱导LiNi 0.85 Co 0.10 Mn 0.05 O 2正极材料的稳定行为
我们在本文中提出了一种在250–400°C下通过SO 2气体处理对高比容量富镍阴极材料LiNi 0.85 Co 0.10 Mn 0.05 O 2（NCM85）进行改性和稳定化的方法，其在高级锂离子电池中的电化学性能。已确定SO 2与NCM85的相互作用导致形成纳米级Li 2 SO 4氧化物颗粒上的表面层对材料的整体结构及其形态没有影响。如高分辨率XPS和电子顺磁共振研究所揭示的，我们将上述相互作用视为氧化还原过程，导致硫的直接氧化和Ni 3+的部分还原。SO 2处理的重要影响是与未处理的NCM85阴极相比，包含该材料的阴极具有显着稳定的循环性能，循环时容量保持率提高了约10％，电压滞后降低。经SO 2处理的NCM85材料还具有显着的热稳定性，表明与标准EC-EMC / LiPF 6发生热反应时产生的热量较低。与未处理的材料相比，溶液的溶解度提高了12–20％。通过SO 2处理改性富镍NCM阴极材料表面的方法被证明是增强其电化学性能的一种有前途的方法。这项工作通过增加镍的含量（与任何基准阴极相比），证明了富镍NCM阴极材料在性能上的飞跃，并且是通过表面改性来稳定化的一种有前途的方法。
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