Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 701, Issue -, Pages 67-74Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.01.123
Keywords
Liquid-phase exfoliation; NH4Co0.4Ni0.6PO4 center dot H2O nanosheets; Ultra-long cycling life; Energy storage
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Funding
- fundamental research funds for the Central Universities [106112015CDJZR305501]
- Defense Key Disciplines Lab of Novel Micro-nano Devices and System Technology Foundation
- synergistic Innovative Joint Foundation of CAEP-SCU [XTCX2014007]
- Graduate Scientific Research and innovation foundation of Chongqing, China [CYS16036]
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Liquid-phase exfoliation is an effective method to fabricate thin nanosheet materials with layered structure. In this paper, we successfully synthesized NH4Co0.4Ni0.6PO4 center dot H2O nanosheets with the thickness of about tens of nanometers through liquid-phase exfoliation under ultrasonication. Specifically, the formamide solution was chosen as the exfoliation solvent due to it is capable of entering the interlayer of bulk materials and rapidly swelling between layers. Electrochemistry tests revealed that the optimized exfoliation time was 4 days. The asymmetric battery type energy storage device AC//NH4Co0.4Ni0.6PO4 center dot H2O nanosheets showed an energy density of 10.8 Wh kg(-1) at the power density of 703.1 W kg(-1). More importantly, the long-term cycle stability measurements demonstrated that NH4Co0.4 Ni0.6PO4 center dot H2O nanosheets after exfoliation had an ultra-long cycling life that still retained 102.3% of specific capacitance even 10000 continuous charge/discharge cycles. (C) 2017 Elsevier B.V. All rights reserved.
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