钠掺杂对锂离子电池正极层状LiNi1/3Co1/3Mn1/3O2单晶结构的影响

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Dongsheng Yu, Jili Li, Zhiyu Min, Chunjuan Tang, Peiguo Meng, Baotai Chen
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引用次数: 3

摘要

单晶结构的锂离子电池阴极由于具有完整的晶体结构和较小的内应力,具有稳定的循环性能。本文通过简单的溶胶-凝胶法将半径较大的Na+离子掺杂到LiNi1/3Co1/3Mn1/3O2 (LNCMO)单晶纳米颗粒中,进一步提高了速率能力。为了说明单晶结构与钠掺杂的协同效应,考虑了不同钠掺杂量。结果表明,在0.2℃下,Li0.9Na0.1Ni1/3Co1/3Mn1/3O2阴极的放电容量为193.7 mAh g-1,远高于未掺杂Li0.9Na0.1Ni1/3Co1/3Mn1/3O2阴极的174.8 mAh g-1。循环50次后,未掺杂LNCMO的容量保持率从71.3%提高到Li0.9Na0.1Ni1/3Co1/3Mn1/3O2的89.2%。同时,Li0.9Na0.1Ni1/3Co1/3Mn1/3O2在10℃下的放电容量为137.9 mAh g-1,约为LNCMO的两倍。在晶格中掺入Na离子可以放大锂层之间的距离,并作为引脚,使结构更稳定,Li+离子扩散动力学更快。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The effect of Na doping on layered LiNi1/3Co1/3Mn1/3O2 single-crystal structure as a cathode for lithium-ion batteries
A cathode with single-crystal structure for Li-ion batteries is shown to provide stable cycle performance because of its integrated crystal structure and smaller internal stress. Here, Na+ ions with larger radius are doped into LiNi1/3Co1/3Mn1/3O2 (LNCMO) single-crystal nanoparticles through a simple sol–gel method to further improve the rate capability. Different amounts of Na doping are considered to illustrate the cooperative effect of single-crystal structure and Na doping. The results indicate that a Li0.9Na0.1Ni1/3Co1/3Mn1/3O2 cathode has a discharge capacity of 193.7 mAh g–1 at 0.2 C, much higher than the 174.8 mAh g–1 of its undoped counterpart. After 50 cycles, the capacity retention is enhanced from 71.3% for undoped LNCMO to 89.2% for Li0.9Na0.1Ni1/3Co1/3Mn1/3O2. At the same time, Li0.9Na0.1Ni1/3Co1/3Mn1/3O2 delivers a discharge capacity of 137.9 mAh g–1 at 10 C, about twice the capacity of LNCMO. Na ions doped into the lattice can magnify the distances between lithium layers and act as pins for more stable structure and faster kinetics of Li+-ion diffusion.
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来源期刊
Nano Futures
Nano Futures Chemistry-General Chemistry
CiteScore
4.30
自引率
0.00%
发文量
35
期刊介绍: Nano Futures mission is to reflect the diverse and multidisciplinary field of nanoscience and nanotechnology that now brings together researchers from across physics, chemistry, biomedicine, materials science, engineering and industry.
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