期刊
JOURNAL OF POWER SOURCES
卷 363, 期 -, 页码 34-43出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.07.005
关键词
Potassium-ion capacitor; Hybrid supercapacitors; Graphite; Cycling stability; Energy density
资金
- CEA Enhanced Eurotalents program
Hybrid supercapacitors, combining capacitive carbon-based positive electrode with a Li-ion battery-type negative electrode have been developed in the pursuit of increasing the energy density of conventional supercapacitor without impacting the power density. However, lithium-ion capacitors yet hardly meet the specifications of automotive sector. Herein we report for the first time the development of new hybrid potassium-ion capacitor (KIC) technology. Compared to lithium-ion capacitor (LIC) all strategic materials (lithium and copper) have been replaced. Excellent electrochemical performance have been achieved at a pouch cell scale, with cyclability superior to 55 000 cycles at high charge/discharge regime. For the same cell scale, the energy density is doubled compared to conventional supercapacitor up to high power regime (>1.5 kW kg(-1)). Finally, the technology was successfully scaled up to 18650 format leading to very promising prospects for transportation applications. (C) 2017 Elsevier B.V. All rights reserved.
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