Porous activated carbon derived from Chinese-chive for high energy hybrid lithium-ion capacitor
Abstract
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 (3011m2g-1) and relatively applicable pore volume (2.6m3g-1). Besides, it displays excellent capacitive performance with specific capacity of 124mAh g-1 at a current density of 0.3Ag-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 159Whkg-1 at 945Wkg-1 and outstanding cycle stability (with 80% capacity retention rate after 8000 cycles at 1Ag-1).
- Publication:
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Journal of Power Sources
- Pub Date:
- September 2018
- DOI:
- 10.1016/j.jpowsour.2018.07.062
- Bibcode:
- 2018JPS...398..128L
- Keywords:
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- Biomass-derived porous carbon;
- Chinese-chives;
- Electric double-layer capacitor;
- Lithium ion battery;
- Hybrid lithium-ion capacitor