SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Nanoscale. 2016 Jun 7;8(21):11234-40. doi: 10.1039/c6nr02589g. Epub 2016 May 18.
In order to improve the electrochemical performance of LiNi1/3Co1/3Mn1/3O2 as a lithium insertion positive electrode material, atom-scale modification was realized to obtain the layered oxysulfide LiNi1/3Co1/3Mn1/3O2-xSx using a novel plasma-enhanced doping strategy. The structure and electrochemical performance of LiNi1/3Co1/3Mn1/3O2-xSx are investigated systematically, which confirms that the S doping can make the structure stable and benefit the electrochemical performance. The phys-chemical characterizations indicate that oxygen atoms in the initial LiNi1/3Co1/3Mn1/3O2 have been partially replaced by S atoms. It should be pointed out that the atom-scale modification does not significantly alter the intrinsic structure of the cathode. Compared to the pristine material, the LiNi1/3Co1/3Mn1/3O2-xSx shows a superior performance with a higher capacity (200.4 mA h g(-1)) and a significantly improved cycling stability (maintaining 94.46% of its initial discharge capacity after 100 cycles). Moreover, it has an excellent rate performance especially at elevated performance, which is probably due to the faster Li(+) transportation after S doping into the layered structure. All the results show that the atom-scale modification with sulfur atoms on LiNi1/3Co1/3Mn1/3O2, which significantly improved the electrochemical performance, offers a novel anionic doping strategy to realize the atom-scale modification of electrode materials to improve their electrochemical performance.
为了提高 LiNi1/3Co1/3Mn1/3O2 作为锂离子嵌入正极材料的电化学性能，采用一种新颖的等离子体增强掺杂策略，实现了原子级修饰，得到了层状氧硫化物 LiNi1/3Co1/3Mn1/3O2-xSx。系统研究了 LiNi1/3Co1/3Mn1/3O2-xSx 的结构和电化学性能，证实了 S 掺杂可以使结构稳定并有利于电化学性能。物理化学特性表明，初始 LiNi1/3Co1/3Mn1/3O2 中的氧原子已被部分取代为 S 原子。值得指出的是，原子级修饰不会显著改变阴极的固有结构。与原始材料相比，LiNi1/3Co1/3Mn1/3O2-xSx 表现出更好的性能，具有更高的容量（200.4 mA h g(-1)) 和显著改善的循环稳定性（在 100 次循环后保持其初始放电容量的 94.46%）。此外，它具有出色的倍率性能，特别是在提高性能时，这可能是由于 S 掺杂到层状结构中后 Li(+)传输速度加快所致。所有结果表明，原子级修饰用硫原子对 LiNi1/3Co1/3Mn1/3O2 进行修饰，显著提高了电化学性能，为实现电极材料的原子级修饰以提高其电化学性能提供了一种新的阴离子掺杂策略。
