期刊
JOURNAL OF POWER SOURCES
卷 398, 期 -, 页码 128-136出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.07.062
关键词
Biomass-derived porous carbon; Chinese-chives; Electric double-layer capacitor; Lithium ion battery; Hybrid lithium-ion capacitor
资金
- National Natural Science Foundation of China [51072173, 51272221, 51302239]
- Specialized Research Fund for the Doctoral Program of Higher Education [20134301130001]
- Natural Science Foundation of Hunan Province, China [13JJ4051]
Lithium-ion capacitor is a hybrid electrochemical energy storage device, which combines the intercalation mechanism of lithium ion battery with the cathode of electric double-layer capacitor. To improve the energy density of hybrid Lithium-ion capacitor, a high-performance ion adsorption cathode is essential. Herein the porous activated carbon for using as cathode of hybrid Lithium-ion capacitor has been prepared through a two-step fabrication process in which naturally Chinese-chives are used as biomass carbon precursor. The biomass derived porous carbon exhibits an extremely high specific surface area (3011 m(2) g(-1)) and relatively applicable pore volume (2.6 m(3) g(-1)). Besides, it displays excellent capacitive performance with specific capacity of 124 mAh g(-1) at a current density of 0.3 A g(-1), good rate capability and outstanding cycling stability in organic electrolyte. The hybrid Lithium-ion capacitor is assembled using biomass-derived porous carbon as cathode material and the silicon/flake graphite/carbon nanocomposite as anode material. The hybrid device shows a high energy density of 159 W h kg(-1) at 945 W kg(-1) and outstanding cycle stability (with 80% capacity retention rate after 8000 cycles at 1 A g(-1)).
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