Journal
JOURNAL OF POWER SOURCES
Volume 412, Issue -, Pages 559-567Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.11.080
Keywords
Trimetal hydroxides; Nickel - cobalt - manganese hydroxide; Synergetic electrochemistry; Hybrid supercapacitors
Funding
- Natural Science Foundation of Zhejiang Province [LQ178010002]
- Natural Science Foundation of Shandong Province [ZR2017BB042]
- China Postdoctoral Science Foundation [2017M612184]
- Source Innovation Plan Project for Basic Application Research of Qingdao [17-1-1-25-jch]
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Electroactive materials with high electrochemical activity, good rate capability and excellent cycling stability are urgently needed for hybrid supercapacitors, but achieving those performances at the same time is still a big challenge. Here, a phase nickel - cobalt - manganese hydroxide (NiCoMn - OH) with a flower-like structure is synthesized and used as the battery materials for hybrid supercapacitor. The NiCoMn - OH exhibits strong synergetic electrochemistry between the transition metals, which contributes better charge storage performances. The NiCoMn - OH shows a specific capacity of 757 C g(-1) at 1 A g(-1) and retains 369 C g(-1) at very high specific current of 50 A g(-1), which are both much higher than the corresponding bimetal and nomometal hydroxides. Therefore, both high electrochemical activity and rate capability have been achieved. The a phase NiCoMn - OH also exhibits a long-term cycling stability because the specific role of Co, maintaining 100% of the specific capacity after 1200 cycles. The hybrid supercapacitor based on NiCoMn - OH also shows high specific capacity of 219 C g(-1) at 1 A g(-1), high rate performance of 53% capacity retention when the specific current increases 25 times and ultralong cycling stability of 83% capacity retention after 12,000 cycles.
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