期刊
JOURNAL OF POWER SOURCES
卷 359, 期 -, 页码 270-276出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.05.070
关键词
Rock-salt cathode; Lithium ion battery; Peroxide O-2(n-); Percolation network; Nickel substitution
资金
- Science Fund for Creative Research Groups of NSFC [11321503]
- National Key Research and Development Program of China [2016YFA0401004]
- National Natural Science Foundation of China [NSFC 11275227, U1632103]
- Youth Innovation Promotion Association CAS [2014297]
Peroxide structure O-2(n-) has proven to appear after electrochemical process in many lithium-excess precious metal oxides, representing extra reversible capacity. We hereby report construction of a Liexcess rock-salt oxide Li1+xNi1/2-3x/2Ru1/2+x/2O2 electrode, with cost effective and eco-friendly 3d transition metal Ni partially substituting precious 4d transition metal Ru. It can be seen that O-2(n-) is formed in pristine Li1.23Ni0.155Ru0.615O2, and stably exists in subsequent cycles, enabling discharge capacities to 295.3 and 198 mAh g(-1) at the 1st/50th cycle, respectively. Combing ex-situ X-ray absorption near edge spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, high resolution transmission electron microscopy and electrochemical characterization, we demonstrate that the excellent electrochemical performance comes from both percolation network with disordered structure and cation/anion redox couples occurring in charge-discharge process. Li- excess and substitution of common element have been demonstrated to be a breakthrough for designing novel high performance commercial cathodes in rechargeable lithium ion battery field. (C) 2017 Elsevier B.V. All rights reserved.
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