Mo Yan, Liu Shaofeng, Yuan Guohui, Li Zikun, Zhang Meng, Guo Lingjun
School of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 150001 People's Republic of China
Shenzhen BTR Nanotechnology Co., Ltd Shenzhen 518106 People's Republic of China
RSC Adv. 2024 Jan 17;14(5):2889-2895. doi: 10.1039/d3ra07178b.
For developing commercially viable LiNiMnCoO (NCM), it is necessary to alleviate the irreversible chemical process upon Li-ion insertion/extraction, which primarily accounts for prevailing capacity loss, impedance buildup as well as low columbic efficiency. To resolve this issue, we herein propose a simple but novel method to alter the chemical composition by a facile treatment of HO, which remarkably reduces the cation mixing of Li/Ni and residual lithium on the cathode. The tailored composition contributes great resistance to the structural reconstruction and enhancement in structural reversibility, as shown by Raman and high-resolution transmission electron microscope (HRTEM) results. Thus, the modified sample outperforms the pristine one; it exhibits cyclability with 95.7% capacity retention over 300 cycles, high columbic efficiency and enhanced rate capability.
为了开发具有商业可行性的锂镍锰钴氧化物（NCM），有必要减轻锂离子嵌入/脱出过程中的不可逆化学过程，这主要是导致容量损失、阻抗增加以及库仑效率低下的原因。为了解决这个问题，我们在此提出一种简单而新颖的方法，通过对HO进行简便处理来改变化学成分，这显著减少了阴极上Li/Ni的阳离子混合和残余锂。如拉曼光谱和高分辨率透射电子显微镜（HRTEM）结果所示，定制的成分对结构重构具有很大的抗性，并提高了结构可逆性。因此，改性样品优于原始样品；它在300次循环中表现出95.7%的容量保持率、高库仑效率和增强的倍率性能。
