期刊
SMALL
卷 16, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202001935
关键词
F-doping; cycling stability; flexible Zn batteries; NiCo-CH
类别
资金
- Natural Science Foundation of Guangdong Province, China [2019A1515011819]
- National Key R& D Program of China [2019YFA0705100]
- China Postdoctoral Science Foundation [2019M650881]
- Youth Program of National Natural Science Foundation of China [21905300]
- key R&D project of Shandong Province [2019GGX103032]
- GRF Scheme [CityU 11305218]
Cathodes of rechargeable Zn batteries typically face the issues of irreversible phase transformation, structure collapse, and volume expansion during repeated charge/discharge cycles, which result in an increased transfer resistance and poor long-term cycling stability. Herein, a facile F doping strategy is developed to boost the cycling stability of nickel cobalt carbonate hydroxide (NiCo-CH) cathode. Benefiting from the extremely high electronegativity, the phase and morphology stabilities as well as the electrical conductivity of NiCo-CH are remarkably enhanced by F incorporation (NiCo-CH-F). Phase interface and amorphous microdomains are also introduced, which are favorable for the electrochemical performance of cathode. Benefiting from these features, NiCo-CH-F delivers a high capacity (245 mA h g(-1)), excellent rate capability (64% retention at 8 A g(-1)), and outstanding cycling stability (maintains 90% after 10 000 cycles). Moreover, the quasi-solid-state battery also manifests superior cycling stability (maintains 90% after 7200 cycles) and desirable flexibility. This work offers a general strategy to boost the cycling stability of cathode materials for aqueous Zn batteries.
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