具有三维传输通道的化学键合Ti_(3)C_(2) MXene@C复合材料促进混合电容器中的锂离子存储  

Engineering chemical-bonded Ti_(3)C_(2) MXene@carbon composite films with 3D transportation channels for promoting lithium-ion storage in hybrid capacitors

作　　者：冯敏 王万里 胡兆伟 范呈 赵晓冉 王朋 李慧芳 杨磊 王晓君 刘治明 Min Feng;Wanli Wang;Zhaowei Hu;Cheng Fan;Xiaoran Zhao;Peng Wang;Huifang Li;Lei Yang;Xiaojun Wang;Zhiming Liu(College of Electromechanical Engineering,Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials,Qingdao University of Science&Technology,Qingdao 266061,China;Research Center for Intelligent and Wearable Technology,College of Textiles and Clothing,Qingdao University,Qingdao 266071,China;Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),College of Chemistry,Nankai University,Tianjin 300071,China)

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,China [2]Research Center for Intelligent and Wearable Technology,College of Textiles and Clothing,Qingdao University,Qingdao 266071,China [3]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),College of Chemistry,Nankai University,Tianjin 300071,China

出　　处：《Science China Materials》2023年第3期944-954,共11页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (22005167 and 21905152);Shandong Provincial Natural Science Foundation (ZR2020QB125 and ZR2020MB045);China Postdoctoral Science Foundation (2021M693256, 2021T140687 and 2022M713249);Qingdao Postdoctoral Applied Research Project, Taishan Scholar Project of Shandong Province (ts20190937);the Youth Innovation Team Project for Talent Introduction and Cultivation in Universities of Shandong Province。

摘　　要：锂离子电容器(LICs)是一种很有前途的储能装置,因为它们同时具有锂离子电池的高能量密度和超级电容器的高功率密度的特点.然而,由于锂离子电容器中阳极和阴极之间电化学反应动力学的不匹配使得探索具有快速离子扩散和电子转移通道的阳极材料面临挑战.在此,通过静电纺丝策略将具有可控末端基团的二维Ti_(3)C_(2)MXene引入一维碳纳米纤维中,形成三维导电网络.在这种Ti_(3)C_(2)MXene和碳基复合材料(称为KTi-400@CNFs)中,二维纳米片结构赋予了Ti_(3)C_(2)MXene更多Li+存储活性位点,而碳骨架则有利于提高复合材料的导电性.更值得一提的是,在Ti_(3)C_(2)MXene和碳骨架的界面上形成了Ti–O–C键.复合材料中的这种化学键为电子的快速传输和离子在层与层之间纵向的快速扩散建立了桥梁.因此,优化后的KTi-400@CNFs复合材料在电流密度为5 A g-1的情况下,500次循环后仍保持235 mA h g-1的良好容量.由KTi-400@CNFs//AC组成的锂离子电容器实现了高能量密度(114.3 W h kg-1)和高功率密度(12.8 kW kg-1).KTi-400@CNFs的这种独特结构和优异的电化学性能为二维材料制备提供了参考.Lithium-ion capacitors (LICs) are promising energy storage devices because they feature the high energy density of lithium-ion batteries and the high power density of supercapacitors.However,the mismatch of electrochemica reaction kinetics between the anode and cathode in LICs makes exploring anode materials with fast ion diffusion and electron transfer channels an urgent task.Herein,the twodimensional (2D) Ti_(3)C_(2)MXene with controllable terminal groups was introduced into 1D carbon nanofibers to form a3D conductive network by the electrospinning strategy.In such Ti_(3)C_(2)MXene and carbon matrix composites (named KTi-400@CNFs),the 2D nanosheet structure endows Ti_(3)C_(2)MXene with more active sites for Li+ion storage,and the carbon framework is favorable to the conductivity of the composites Impressively,Ti–O–C bonds are formed at the interface between Ti_(3)C_(2)MXene and the carbon framework.Such chemica bonding in the composites builds a bridge for rapid electron transportation and quick ion diffusion in the longitudinal direction from layer to layer.As a result,the optimized KTi-400@CNFs composites maintain a good capacity of235 mA h g-1for 500 cycles at a current density of 5 A g-1.The LIC consisting of the KTi-400@CNFs//AC configuration achieves high energy density (114.3 W h kg-1) and high power density (12.8 kW kg-1).This paper provides guidance for designing 2D materials and the KTi-400@CNFs composites with such a unique structure and superior electrochemical performance have great potential in the next-generation energy storage fields.

关 键 词：锂离子电容器 锂离子电池 超级电容器 混合电容器 阳极材料 高能量密度 碳基复合材料 电化学性能 

分 类 号：TM53[电气工程—电器] TB332[一般工业技术—材料科学与工程]