Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 18, Pages 15542-15547Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b15314
Keywords
energy storage; hybrid capacitor; potassium-ion intercalation; K2Ti6O13; nanoporous graphenic carbon
Funding
- National Key Basic Research Program of China [2014CB239701]
- National Natural Science Foundation of China [21773118, 51504139, 51672128]
- Jiangsu Province 333 high-level talents training project
- United States National Science Foundation [1551693]
- NUAA [BCXJ16-07]
- Funding of Jiangsu Innovation Program for Graduate Education [KYLX16_0341]
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To fill the gap between batteries and supercapacitors requires integration of the following features in a single system: energy density well above that of supercapacitors, cycle life much longer than Li-ion batteries, and low cost. Along this line, we report a novel nonaqueous potassium-ion hybrid capacitor (KIC) that employs an anode of K2Ti6O13 (KTO) microscaffolds constructed by nanorods and a cathode of N-doped nanoporous graphenic carbon (NGC). K2Ti6O13 microscaffolds are studied for potential applications as the anode material in potassium-ion storage for the first time. This material exhibits an excellent capacity retention of 85% after 1000 cycles. In addition, the NGC//KTO KIC delivers a high energy density of 58.2 Wh kg(-1) based on the active mass in both electrodes, high power density of 7200 W kg(-1), and outstanding cycling stability over 5000 cycles. The usage of K ions as the anode charge carrier instead of Li ions and the amenable performance of this device suggest that hybrid capacitor devices may welcome a new era of beyond lithium.
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