期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 44, 页码 22393-22403出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta07110k
关键词
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资金
- Thousand Young Talents Program of the Chinese Central Government [0220002102003]
- National Natural Science Foundation of China (NSFC) [21373280, 21403019]
- Fundamental Research Funds for the Central Universities [0301005202017]
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Hundred Talents Program at Chongqing University [0903005203205]
Binary metal oxides have been regarded as potential electrode materials for supercapacitors and lithium-ion batteries, which can ameliorate and compensate the deficiency of electrochemical performance of single metal oxides, such as reversible capacitance/capacity, structural stability and electronic conductivity. In this work, we report a facile solvothermal method to synthesize hierarchical dandelion-like NiCo2O4 microspheres@nanomeshes (NCO-M@N) with a high surface area (105.2 m(2) g(-1)), which exhibit superior pseudocapacitive performance with high specific capacitance (2184 F g(-1)), remarkable rate capability and excellent cycling performance (94.2% retention after 4000 cycles), meanwhile, displaying excellent energy storage properties for lithium-ion batteries, such as admirable rate performance (785 mA h g(-1) at a current density of 2000 mA g(-1)) and an outstanding capacity retention of 88% after 100 cycles. Most importantly, when the NCO-M@N//AC asymmetric supercapacitor is prepared, it exhibits the highest energy density (45.3 W h kg(-1)) at a power density of 533.3 W kg(-1) and good cycling stability (89% of the initial capacitance retention at 5 A g(-1) over 4000 cycles), indicating its potential applications for next-generation high power supercapacitors and lithium-ion batteries. The strategy is simple but very effective, and thus it can be extended to other high-capacity metal oxide materials.
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