期刊
NANO LETTERS
卷 21, 期 23, 页码 9997-10005出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c03613
关键词
Ni-rich cathode material; single-crystal cathode; local structure dynamics; in situ synchrotron characterization
类别
资金
- National Key R&D Program of China [2020YFA0406203]
- Shenzhen Science and Technology Innovation Commission [JCYJ20180507181806316, SGDX2019081623240948]
- ECS scheme [CityU 21307019]
- Shenzhen Research Institute, City University of Hong Kong
- DOE Office of Science [DE-AC02-06CH11357]
A highly stable single-crystal LiNi0.83Co0.12Mn0.05O2 cathode material with high specific capacity and excellent cycling stability has been reported, with structural changes driven by unique Li-intercalation kinetics in single crystals to reduce cracks and ensure high cycling stability.
The capacity degredation in layered Ni-rich LiNixCoyMnzO2 (x >= 0.8) cathode largely originated from drastic surface reactions and intergranular cracks in polycrystalline particles. Herein, we report a highly stable single- crystal LiNi0.83Co0.12Mn0.05O2 cathode material, which can deliver a high specific capacity (similar to 209 mAh g(-1) at 0.1 C, 2.8-4.3 V) and meanwhile display excellent cycling stability (>96% retention for 100 cycles and >93% for 200 cycles). By a combination of in situ X-ray diffraction and in situ pair distribution function analysis, an intermediate monoclinic distortion and irregular H3 stack are revealed in the single crystals upon charging-discharging processes. These structural changes might be driven by unique Li-intercalation kinetics in single crystals, which enables an additional strain buffer to reduce the cracks and thereby ensure the high cycling stability.
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