Sim Seong-Ju, Lee Seung-Hwan, Jin Bong-Soo, Kim Hyun-Soo
Next Generation Battery Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Republic of Korea.
Department of Advanced Materials Engineering, Daejeon University, Daejeon, 34520, Republic of Korea.
Sci Rep. 2020 Jul 6;10(1):11114. doi: 10.1038/s41598-020-67818-5.
Ni-rich cathode is one of the promising candidate for high-energy lithium-ion batteries. In this work, we prepare the different super-P carbon black amounts [0.1 (SPB 0.1 wt%), 0.3 (SPB 0.3 wt%), 0.5 (SPB 0.5 wt%) and 0.7 wt% (SPB 0.7 wt%)] of carbon coated LiNiCoMnO (NCM811) cathodes and their electrochemical performances are investigated. Carbon coating does not change the crystal structure and morphology of NCM811. Among the coated NCM811, the SPB 0.5 wt% NCM811 delivers the excellent cyclability (87.8% after 80 cycles) and rate capability (86.5% at 2 C) compared to those of pristine NCM811. It is ascribed to that the carbon coating not only increase the Li ion and electron transfer as well as protect the NCM811 cathode materials from side reaction at the electrolyte/NCM811 interface. Therefore, we can conclude that the appropriate amount of carbon coating can be regarded as an effective approach for Ni-rich NCM cathode.
富镍正极是高能锂离子电池有前景的候选材料之一。在本工作中，我们制备了不同超P炭黑含量[0.1（SPB 0.1 wt%）、0.3（SPB 0.3 wt%）、0.5（SPB 0.5 wt%）和0.7 wt%（SPB 0.7 wt%）]的碳包覆LiNiCoMnO（NCM811）正极，并研究了它们的电化学性能。碳包覆没有改变NCM811的晶体结构和形貌。在包覆的NCM811中，与原始NCM811相比，SPB 0.5 wt%的NCM811表现出优异的循环稳定性（80次循环后为87.8%）和倍率性能（2 C下为86.5%）。这归因于碳包覆不仅增加了锂离子和电子传输，还保护了NCM811正极材料在电解质/NCM811界面处不发生副反应。因此，我们可以得出结论，适量的碳包覆可被视为富镍NCM正极的一种有效方法。
