期刊
RSC ADVANCES
卷 9, 期 16, 页码 9079-9085出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra10116g
关键词
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资金
- National Natural Science Foundation of China [U1407118, 21521005]
- Research Institute of Petroleum Processing Sinopec [218025-1]
LiNi1-xCoxO2 cathode materials were successfully synthesized from coated (1-x)Ni(OH)(2)@xCo(OH)(2) and doped Ni1-xCox(OH)(2) precursors, and the effects of the Co site and content in the precursor and final cathode material on the structure, morphology, and electrochemical performance of the cathodes were investigated using X-ray diffraction, scanning electron microscopy, and charge-discharge tests. The electrochemical performance of the materials prepared from the coated precursor was generally better than that of the materials prepared from the doped precursor. However, with increasing Co content, the performance difference gradually decreased. Among the as-prepared samples, the sample coated with 12 mol% Co delivered an excellent reversible capacity of 213.8 mA h g(-1) at 0.1C and the highest capacity retention of 88.5% after 100 cycles at 0.2C in the voltage range of 2.75-4.3 V. High-performance LiNi1-xCoxO2 materials were successfully synthesized, and our findings clearly reveal the differences in the electrochemical properties of the materials prepared from the two different precursors with increasing Co content, thereby providing a valuable reference for the synthesis of high-performance Ni-rich layered cathode materials for Li-ion batteries.
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