期刊
INORGANIC CHEMISTRY FRONTIERS
卷 6, 期 7, 页码 1694-1700出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9qi00333a
关键词
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资金
- MOST [2016YFA0202503, 2017YFA0206700]
- NSFC [21835004]
- MOE [B12015]
- Tianjin Project [18JCZDJC31100]
- Fundamental Research Funds for the Central Universities
Lithium-rich layered oxides are attractive high-energy cathode materials for lithium-ion batteries but suffer from structural instability that incurs voltage fading, capacity loss, and poor kinetics. Here, we report the synthesis of Li1.2Mn0.52Co0.13Ni0.13O2 (LMCN) through the co-precipitation method and the performance improvement of LMCN with ceric ammonium nitrate (CAN) etching. Combining X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy reveals that chemical etching modifies the surface composition and generates a thin amorphous layer, which mitigates structural collapse and lattice oxygen release. Compared with pristine LMCN, the etched sample exhibits improved capacity retention (from 58.7% to 76.6% after 200 cycles at 1C) and rate capability (from 125 to 140 mA h g(-1) at 5C). The results suggest that chemical etching is an efficient strategy to enhance Li-rich oxide cathode materials.
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