Journal
IONICS
Volume 27, Issue 1, Pages 165-174Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-020-03798-w
Keywords
Decalcified fish scales; Hierarchical porous carbon; Nitrogen doping; Lithium-sulfur batteries
Funding
- International Cooperation Project - Ministry of Science and Technology of China [2015DFR50350]
- China Postdoctoral Science Foundation [2019M653706, 2018M633544]
- Postdoctoral Science Foundation of Shaanxi Province [2018BSHEDZZ120]
- Science and Technology Department of Shaanxi Provincial Government [2019TD-019, 2018GHJD-17, 2020JM450, 2018JM7104]
- Education Department of Shaanxi Provincial Government [18JK0579, 17JK0554]
- National Natural Science Foundation of China [51702256]
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The DFSC/S composite, derived from fish scales, exhibits high surface area, large pore volume, moderate nitrogen content, and hierarchical porous structure, delivering superior specific discharge capacity and cycling stability in lithium-sulfur batteries.
A decalcified sponge-like nitrogen-doped porous carbon (DFSC) derived from fish scales has been synthesized via decalcification, pre-carbonization, and KOH activation processes. The synthesized carbon possesses high surface area of 2520.9 m(2) g(-1), large pore volume of 1.40 cm(3) g(-1), moderate nitrogen content, and hierarchical porous structure, which was used to prepare DFSC/S composite as cathode material in lithium-sulfur (Li-S) batteries. The DFSC/S composite delivered a better discharge specific capacity of 473.9 mAh g(-1)after 500 cycles at 0.1 C, and the decay rate per cycle was 0.83%. Even at a higher rate of 0.5 C, the capacity retention of DFSC/S composite was 446.3 mAh g(-1)after 400 cycles. The superior performance of the DFSC/S composite was attributed to the highly porous structure, which not only can provide sufficient accommodation space, but also can improve the infiltration of electrolyte, facilitating rapid Li(+)ion transfer in Li-S batteries. The moderate nitrogen doping in carbon matrix can strengthen the chemical adsorption of polysulfides. Therefore, DFSC/S composite is a promising cathode material to improve the electrochemical performance of Li-S batteries.
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