期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 674, 期 -, 页码 360-367出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.03.061
关键词
Single-crystal; Nickel-high; Hydrothermal; Cathode material; Lithium-ion batteries
资金
- NSAF [U1530155]
- Nation Key Basic Research Program of China [2015CB251100]
- Beijing Higher Institution Engineering Research Center for Power Battery and Chemical Energy Materials [2012039032]
- National Natural Science Foundation of China [21443013]
- Jiangxi Provincial Department of Science and Technology [20133BBE50014]
- Science Foundation of the Education Department of Jiangxi province [KJLD13020]
Single-crystal nickel-high materials (ST-LNCMO) LiNi0.6Co0.2Mn0.2O2 have been synthesized using a versatile hydrothermal method. The as-prepared samples are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), and selected area electron diffraction (SAED). The results show that the sample annealed at an optimized temperature of 850 degrees C reveals uniform fine well-crystallized single-particles with diameters of similar to 800 nm. Electrochemical data demonstrate that the cell using this nickel-high material as the cathode exhibits excellent performance. The sample displays a high capacity of 183.7 mA h.g(-1) at 36 mA.g(-1) (0.2 C) and excellent cycling stability at different rates. It yields an initial discharge capacity of 153.6 mA h.g(-1) at a rate of 10C-rate and a voltage of 2.8 - e 4.3 V. The sample also has an outstanding rate capacity at a high cut-off voltage (4.6 V). This superior performance is attributed to the merits of the single-crystal structure, which may be beneficial to the transportation of the Li+ ion along the grain. (C) 2016 Elsevier B.V. All rights reserved.
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