期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 791, 期 -, 页码 100-108出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.03.297
关键词
Li-rich cathode; Cesium doping; Lithium ion diffusion coefficient; Rate capability
资金
- National Science Foundation of China [NSAF U1630106, 51577175]
- National Key RAMP
- D Program of China [2018YFB0905400]
Aiming to improve the rate capability and cycling stability, cesium doped Li-rich cathode materials Li1.2-xCsxNi0.13Co0.13Mn0.54O2 (x = 0, 0.012, 0.036, 0.060, 0.096) are synthesized by a sol-gel method and a subsequent calcination process. The optimal Cs+ content is found to be x = 0.060. After Cesium doping to Li+ sites, the enlarged interplanar spacing of (003) plane, which is confirmed by high resolution transmission electron microscopy, can accelerate the Li+ diffusion during the lithiation/delithiation process at the interface of electrode/electrolyte. The obtained Cs-doped Li-rich sample with x = 0.060 exhibits much improved electrochemical performance compared with the bare, especially the rate capability (148 mAh g(-1) compared to 50 mAh g(-1) at 10 C). The first discharge capacity is much enhanced from 250 to 281 mAh g(-1) at 0.1 C with a heightened coulombic efficiency from 72% to 81%. XRD, SEM, TEM, elemental mapping, EDS and ICP-AES are adopted to characterize the morphologies and structures. (C) 2019 Elsevier B.V. All rights reserved.
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