The low spatial charge-storage density of porous carbons greatly limits volumetric performance in elec-trochemical capacitors.An increase of charge-storage density requires structural refinements to balance the trade-offs between the porosity and density of materials,but the limited mechanical properties of carbons usually fail to withstand effective densifying processes and obtain an ideal pore structure.Herein,we design the stiffened graphene of superior bending rigidity,enabling the fine adjustments of pore structure to maximize the volumetric capacitance for the graphene-based electrodes.The in-plane crumples on graphene sheets are found to contribute largely to the bending rigidity,which is useful to control the structural evolution and maintain sufficient ion-accessible surface area during the assem-bling process.This makes the capacitance of stiffening activated graphene keep 98％when the electrode density increases by 769％to reach 1.13g cm-3 after mechanical pressure,an excellent volumetric energy density of 98.7 Wh L-1 in an ionic-liquid electrolyte is achieved.Our results demonstrate the role of intrinsic material properties on the performance of carbon-based electrodes for capacitive energy storage.

Yuzuo Wang;Jing Chen;Huasong Qin;Ke Chen;Zhuangnan Li;Yan Chen;Juan Li;Tianzhao Hu;Shaorui Chen;Zhijun Qiao;Dianbo Ruan;Quanhong Yang;Yilun Liu;Feng Li

Ningbo University,Institute of Advanced Energy Storage Technology and Equipment,Ningbo 315211,Zhejiang,China;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Ningbo CRRC New Energy Technology Co.,Ltd,Ningbo 315112,Zhejiang,China;Laboratory for Multiscale Mechanics and Medical Science,School of Aerospace,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China;Department of Materials Science and Metallurgy,University of Cambridge,CB3 OFS,United Kingdom;Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education),College of Physics,Jilin University,Changchun 130012,Jilin,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China

能源化学

[1]Yuzuo Wang;Jing Chen;Huasong Qin;Ke Chen;Zhuangnan Li;Yan Chen;Juan Li;Tianzhao Hu;Shaorui Chen;Zhijun Qiao;Dianbo Ruan;Quanhong Yang;Yilun Liu;Feng Li-.Stress-assisted design of stiffened graphene electrode structure toward compact energy storage)[J].能源化学,2022(08):478-487

densifying,crumples

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