期刊
ADVANCED FUNCTIONAL MATERIALS
卷 26, 期 18, 页码 3082-3093出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201505240
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资金
- Singapore MOE AcRF Tier 1 grants [RG2/13, RG104/14, RG98/15]
- Singapore National Research Foundation under MINDEF project: 3D graphene-based supercapacitor [9014100570]
Lithium-ion capacitors (LICs) are hybrid energy storage devices that have the potential to bridge the gap between conventional high-energy lithium-ion batteries and high-power capacitors by combining their complementary features. The challenge for LICs has been to improve the energy storage at high charge-discharge rates by circumventing the discrepancy in kinetics between the intercalation anode and capacitive cathode. In this article, the rational design of new nanostructured LIC electrodes that both exhibit a dominating capacitive mechanism (both double layer and pseudocapacitive) with a diminished intercalation process, is reported. Specifically, the electrodes are a 3D interconnected TiC nanoparticle chain anode, synthesized by carbothermal conversion of graphene/TiO2 hybrid aerogels, and a pyridine-derived hierarchical porous nitrogen-doped carbon (PHPNC) cathode. Electrochemical properties of both electrodes are thoroughly characterized which demonstrate their outstanding high-rate capabilities. The fully assembled PHPNC//TiC LIC device delivers an energy density of 101.5 Wh kg(-1) and a power density of 67.5 kW kg(-1) (achieved at 23.4 Wh kg(-1)), and a reasonably good cycle stability (approximate to 82% retention after 5000 cycles) within the voltage range of 0.0-4.5 V.
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