期刊
ENERGY STORAGE MATERIALS
卷 16, 期 -, 页码 220-227出版社
ELSEVIER
DOI: 10.1016/j.ensm.2018.05.022
关键词
Defects; Li-rich materials; Voltage decay; Lithium ion batteries
资金
- National Key R & D Program of China [2016YFB0100100]
- National Natural Science Foundation of China [21371176]
- Strategic Priority Research Program of Chinese Academy of Sciences (CAS) [XDA09010101]
- Key Research Program of Chinese Academy of Sciences [KGZD-EW-T08]
Li-rich layered oxides are promising high energy-density cathode, but will gradually become defective during cycling, thus suffer detrimental voltage decay. For countering these challenges, here we incorporate abundant nanoscale defects into materials' lattices to construct a bulk-modified Li-rich composites via a direct in-depth chemical de-lithiation. Due to considerable subtle pre-rearrangements, the yielded complex poses certain features as the electrochemically induced hybrids, but turns out to be superior. Involving rebalanced redox activities, it preserves high specific capacities up to 287 mA h g(-1) while presents starting working-potentials close to post-cycled values. Most importantly, this defective structure is capable to enhance the electrochemical stability: except good cycling performances concerning capacity, the tricky and intrinsic voltage decay can also be significantly suppressed to only a fraction of initial levels. This concept of pre-constructing nanoscale disordered system is anticipated to inspire more novel designs of composite cathodes and consequently advance the development of rechargeable lithium-ion battery techniques.
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