Journal
CHEMISTRYSELECT
Volume 4, Issue 33, Pages 9822-9828Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201902966
Keywords
Diffusion coefficient of Li+ ions; Delaying sol-gel method; Internal serial hybrid; Lithium-ion supercapattery; Iithium vanadium phosphate (LVP)
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Funding
- National Natural Science Foundation of China [21566030]
- Ministry of Science, and Technology China-South Africa Joint Research Program [CS08-L15]
- Project of Inner Mongolia Education Department [NJZY089]
- Natural Science Foundation of Inner Mongolia [2015MS0205]
- creative talents team of Prairie Talent engineering industry
- Prairie Talent of organization Department of Inner Mongolia Party Committee
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To construct non-consumable electrolyte type or internal serial hybrid type lithium-ion supercapatteries with both high power and energy densities, carbon-coated lithium vanadium phosphate composite (Li3V2(PO4)(3)/C) is utilized as the cathode. This cathode with a high specific area is synthesized by a hydrothermal method assisted by delayed sol-gel method and using the surfactant of myristyltrimethylammonium bromide as the carbon source. It is self-assembled and mesoporous. This cathode has a high specific surface area of 40.92 m(2)g(-1), a pore volume of 0.095 cm(3)g(-1), a considerably high initial discharge capacity of 166 mAhg(-1) at 0.2 C-rate. Even at 20 C-rate, the high discharge capacity of 90 mAhg(-1) is maintained. The lithium-ion supercapattery assembled using this cathode, the anode of activated carbon as exhibits a discharge time of as long as 1369.24 s, a maximum energy density of 53.22 Wh kg(-1), and a maximum power density of 3.01 kW kg(-1). Such lithiumion supercapatteries thus overcome the disadvantages of rapid energy density attenuation under high power density of existed lithium-ion supercapatteries.
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