Journal
NANO ENERGY
Volume 71, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104626
Keywords
Mn3O4; Li4Mn5O12; 2.2 V; Supercapacitors
Categories
Funding
- National Natural Science Foundation of China [51672220]
- National Defense Science Foundation [32102060303]
- Fundamental Research Funds for the Central Universities of NPU [3102019GHXM002]
- SKLSP Project [2019-TZ-04]
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The difficulty of enlarging the voltage window for aqueous asymmetric supercapacitors seriously impedes the enhancement in energy density, thus affecting their practical applications. Herein, lithium-rich Li4Mn5O12 nanoflakes are firstly in situ synthesized on carbon cloth through the electrochemical oxidation of prefabricated Mn3O4 nanowalls in a traditional three-electrode cell using Li2SO4 as electrolyte. It is intriguingly found that the potential windows for the Mn3O4 and Li4Mn5O12 electrodes can be enlarged to 0-1.2 V (vs Hg/Hg2Cl2) with high specific capacitances of 527 and 627 F g(-1) at 1 mA cm(-2), respectively. The CV kinetic analysis reveals different charge storage mechanisms for the Mn3O4 and Li4Mn5O12 electrodes, major capacitances of which are identified as the surface capacitive contribution and diffusion-controlled contribution, respectively. Making the best of separate potential window of the Li4Mn5O12 cathode and activated carbon anode, the as-assembled aqueous asymmetric supercapacitor device exhibits a wide voltage window of 2.2 V with a large energy density of up to 78 Wh kg(-1) at 295 W kg(-1) as well as ideal cycle stability, significantly outstripping previously reported Mn-based supercapacitors. Therefore, the excellent energy storage property together with low cost enables the assembled aqueous asymmetric supercapacitors to become a highly potential candidate for more possible future applications.
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