Interlayer and intralayer co-modified flexible V_(2)CT_(X) MXene@SWCNT films for high-power Li-ion capacitors  

作　　者：Wanli Wang Min Feng Enze Hu Zhaowei Hu Cheng Fan Huifang Li Peng Wang Xiaojun Wang Zhiming Liu 

机构地区：[1]College of Electromechanical Engineering,Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials,Qingdao University of Science&Technology,Qingdao 266061,Shandong,China [2]Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences,Qingdao 266101,Shandong,China [3]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),College of Chemistry,Nankai University,Tianjin 300071,China

出　　处：《Journal of Energy Chemistry》2023年第4期101-109,共9页能源化学（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant Nos.22005167 and 21905152);the Shandong Provincial Natural Science Foundation of China(Grant Nos.ZR2020QB125 and ZR2020MB045);the China Postdoctoral Science Foundation(Grant Nos.2021M693256,2021T140687 and 2022M713249);the Qingdao Postdoctoral Applied Research Project and the Youth Innovation Team Project for Talent Introduction and Cultivation in Universities of Shandong Province。

摘　　要：As an emerging member of the two-dimensional(2D)material family,V_(2)CT_(X)MXene shows great potential in the application of lithium-ion capacitors(LICs)due to its unique structure and excellent electrical conductivity.However,severe nanosheets stacking and intra-layer transport barriers have limited the further development of V_(2)CT_(X)MXene-based materials.Herein,we prepared Kions and–O functional group co-modified V_(2)CT_(X)MXene(VCT-K)and further incorporated it with single-walled carbon nanotube(SWCNT),obtaining freestanding V_(2)CT_(X)composite films(VCT-K@C)with the 3D conductive network.Significantly,K+ions were introduced into V_(2)CT_(X)MXene to stabilize the interlayer structure and prevent the aggregation of nanosheets,the terminal group of–O was controllably modified on the surface of MXene to improve the Li+ions storage reversible capacities and the SWCNT acted as the bridge between MXene nanosheets to opens up the channels for ion/electron transportation in the longitudinal direction.Benefited from the synergistic effect of VCT-K and SWCNT,the VCT-K@C exhibits superior reversible specific capacities of 671.8 mA h g^(-1)at 0.1 A g^(-1)and 318 mA h g^(-1)at 1.0 A g^(-1).Furthermore,the assembled LICs with VCT-K@C anode coupling activated carbon(AC)cathode deliver an outstanding power density of 19.0 kW kg^(-1)at 67.4 Wh kg^(-1),a high energy density of 140.5 Wh kg^(-1)at 94.8 W kg^(-1)and a stable capacitance retention of 86%after 6000 cycles at 10 A g^(-1).Such unique structures and excellent electrochemical properties are expected to pave the way for the large-scale application in LICs of MXene-based materials.

关 键 词：Interlayer and intralayer co-modification MXene SWCNT Flexible self-supported anodes Lithium-ion capacitors 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM53[电气工程—电器]