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3D Carbon Frameworks for Ultrafast Charge/Discharge Rate Supercapacitors with high energy‑power density

Nano-Micro Letters 2021年第1期13卷 112-122页

作者： Changyu Leng Zongbin Zhao Yinzhou Song Lulu Sun Zhuangjun Fan Yongzhen Yang Xuguang Liu Xuzhen Wang Jieshan Qiu State Key Lab of Fine Chemicals School of Chemical EngineeringLiaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024People’s Republic of China College of Chemical Engineering Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China School of Materials Science and Engineering China University of PetroleumQingdao 266580ShandongPeople’s Republic of China Key Lab of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024People’s Republic of China

Carbon-based electric double layer capacitors(EDLCs)hold tremendous potentials due to their high-power performance and excellent cycle ***,the practical use of EDLCs is limited by the low energy density in aqueous electrolyte and sluggish diffusion kinetics in organic or/and ionic liquids ***,3D carbon frameworks(3DCFs)constructed by interconnected nanocages(10-20 nm)with an ultrathin wall of ca.2 nm have been fabricated,which possess high specific surface area,hierarchical porosity and good conductive *** deoxidization,the deoxidized 3DCF(3DCFDO)exhibits a record low IR drop of 0.064 V at 100 A g^−1 and ultrafast charge/discharge rate up to 10 V s^−*** related device can be charged up to 77.4%of its maximum capacitance in 0.65 s at 100 A g^−1 in 6 M *** has been found that the 3DCF-DO has a great affinity to EMIMBF4,resulting in a high specific capacitance of 174 F g^−1 at 1 A g^−1,and a high energy density of 34 Wh kg^−1 at an ultrahigh power density of 150 kW kg^−1 at 4 V after a fast charge in 1.11 *** work provides a facile fabrication of novel 3D carbon frameworks for supercapacitors with ultrafast charge/discharge rate and high energy-power density.

关键词： 3D carbon frameworks Nanocages Ultrafast charge/discharge rate high energy-power density Supercapacitors

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Layered carbon-based pseudocapacitive materials for lithium/sodium-ion capacitor with high energy-power densities and long cycle life

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Progress in Natural Science:Materials International 2020年第1期30卷 20-27页

作者： Mingxiang Hu Hongwei Zhang Ruitao Lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University Key Laboratory of Advanced Materials (MOE) School of Materials Science and EngineeringTsinghua University

Hybrid ion capacitors that combined high-power density of supercapacitor and high-energy density of battery are drawing attention to insufficient power densities of currently-used lithium-ion batteries（LIBs）.Two kinds of layered carbon-based pseudocapacitive materials were used as both anode and cathode for lithium/sodium ion capacitors（LICs/NICs） with balanced energy/power ***-assembled NIC and LIC could deliver the energy densities of 125.7 Wh kg;and 119.6 Wh kg;at the power density of 7941.2 W kg;and 8823.5 W kg;,*** electrochemical properties of NICs were better than that of LICs when the current density was below 4 A g;although the working voltage of LIC is higher than that of NICs,and the size of Na;is larger than that of Li;.Using an instantaneous potential technique,it is found that the increase of the capacity for anode material in low potential region will effectively enhance the electrochemical performance for the full device.

关键词： Sodium/lithium-ion capacitors high energy-power density Pseudocapacitive electrodes Layered materials

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