Journal
ENERGY STORAGE MATERIALS
Volume 13, Issue -, Pages 1-7Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2017.12.022
Keywords
Zinc-ion based hybrid supercapacitor; Metal anode; Long-life stability; Low cost
Funding
- National Natural Science Foundation of China [51302238]
- Shenzhen Peacock Plan [KQTD20161129150510559, KQJSCX2017033116124476]
- Science and Technology Planning Project of Guangdong Province [2015A010106008, 2017A030310482]
- Shenzhen Science and Technology Planning Project [JCYJ20160122143155757, JSGG20160301173854530, JSGG20160301155933051, JSGG20160229202951528, JCYJ201703-07171232348, JCYJ20170307172850024, JSGG201704131533-02942]
- SIAT Innovation Program for Excellent Young Researchers [2016016]
- China Postdoctoral Science Foundation [2016M602554]
- Guangdong Engineering Technology Research Center Foundation [20151487]
- Shenzhen Engineering Laboratory Foundation [20151837]
- Scientific Equipment Project of Chinese Academy of Sciences [GJHS20170314161200165]
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The development of multivalent cation based rechargeable devices have attracted increased interest because that one mole of multivalent ion can contribute double (for M2+) or triple (for M3+) electrons than monovalent ion (M+). Recently, multivalent cation based battery systems (e.g. Mg2+ and Al3+ batteries) have been widely investigated, however, less attention were paid on multivalent cation based supercapacitors and especially hybrid supercapacitors. Herein, we demonstrate a Zn-ion based hybrid supercapacitor (Zn-HSC) through directly designing Zn foil as both anode and current collector, and bio-carbon derived porous material as the cathode. The bivalent nature and high abundance of zinc can enable the Zn-HSC to achieve high energy density with low cost. After optimization, this Zn-HSC demonstrated superior electrochemical performances such as high discharge capacitance (170 F g(-1) at 0.1 A g(-1)), good rate performance (similar to 85% capacitance retention at 2 A g(-1)), high energy density (52.7 Wh kg(-1) at 1725 W kg(-1) based on the weight of active materials), and excellent cycling stability with 91% capacitance retention after 20,000 cycles at 2 A g(-1).
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