Kim Youngjin, Park Hyoju, Dolocan Andrei, Warner Jamie H, Manthiram Arumugam
Department of Mechanical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States.
ACS Appl Mater Interfaces. 2021 Jun 16;13(23):27096-27105. doi: 10.1021/acsami.1c06277. Epub 2021 Jun 1.
As the push for inexpensive vehicle electrification grows, high-energy-density cathodes for lithium-ion batteries, such as high-nickel layered oxides, have received a great deal of attention in both industry and academia. These materials, however, suffer from severe residual lithium formation, which causes slurry gelation during electrode fabrication and gas evolution during cycling. Herein, a novel cobalt hydroxide coating method on wet-CO gas-treated LiNiMnCoO (Co-CO-NMC91) is presented. Notably, the wet-CO treatment prior to a dry cobalt hydroxide coating plays a critical role in improving the coating uniformity and ultimately decreases the effective residual lithium content. Furthermore, full cells of Co-CO-NMC91 exhibit excellent capacity retention of 91% after 200 cycles. This study highlights how a wet-CO treatment can be used to improve a typical dry coating and provides new insights toward the development of cathodes for high-energy-density LIBs without severe slurry gelation or gas evolution.
随着对廉价车辆电气化的推动力度不断加大，用于锂离子电池的高能量密度阴极，如高镍层状氧化物，在工业界和学术界都受到了广泛关注。然而，这些材料存在严重的残余锂形成问题，这会在电极制造过程中导致浆料凝胶化，并在循环过程中产生气体。在此，我们提出了一种在经湿式一氧化碳（CO）气体处理的LiNiMnCoO（Co-CO-NMC91）上进行新型氢氧化钴涂层的方法。值得注意的是，在干式氢氧化钴涂层之前进行的湿式CO处理在提高涂层均匀性方面起着关键作用，并最终降低了有效残余锂含量。此外，Co-CO-NMC91的全电池在200次循环后表现出91%的优异容量保持率。这项研究突出了湿式CO处理如何用于改进典型的干式涂层，并为开发无严重浆料凝胶化或气体析出的高能量密度锂离子电池阴极提供了新的见解。
