期刊
CHEMSUSCHEM
卷 12, 期 6, 页码 1162-1168出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201802436
关键词
anionic redox reactions; batteries; cathode; Fe substitution; lithium
资金
- National Key Research and Development Program [2016YFB0901703]
- Natural Science Foundation of China [U1664256]
- China-US Electric Vehicle Project [S2016G9004]
- National Key Project on Fundamental Research Program [2015CB251104]
Lithium-rich, Mn-based layered oxides Li2MnO3-LiMO2 (M=Ni, Co) have been considered as promising cathode candidates owing to their high capacity. However, the resources shortage and high price of cobalt make it imperious to substitute cobalt with other high-abundance elements. Here, we synthesized a low-cost, cobalt-free, Fe-substituted oxide material, Li(Li0.16Ni0.19Fe0.18Mn0.46)O-2. It exhibited a high reversible capacity of 169.2 mAh g(-1) after 100 cycles and maintained an extraordinarily high discharge potential during cycling. X-ray photoelectron spectroscopy and DFT calculations revealed that super iron Fe-IV exists in the delithiated state, and oxygen participates in the redox reaction in addition to the Ni2+/Ni4+ and Fe3+/Fe4+ redox couples. The anionic oxidation preferentially occurred on oxygen with a Li-O-Li configuration and with oxidized Fe and Ni coordination.
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