Cationic intermediates assisted self-assembly two-dimensional Ti_(3)C_(2)T_(x)/rGO hybrid nanoflakes for advanced lithium-ion capacitors  被引量:10

阳离子辅助自组装制备二维Ti_(3)C_(2)T_(x)/rGO复合纳米材料及其在高性能锂离子电容器中的应用

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作  者:Sha Yi Lei Wang Xiong Zhang Chen Li Wenjie Liu Kai Wang Xianzhong Sun Yanan Xu Zhanxu Yang Yu Cao Jie Sun Yanwei Ma 易莎;王磊;张熊;李晨;刘文杰;王凯;孙现众;徐亚楠;杨占旭;曹宇;孙洁;马衍伟(Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,China;School of Petrochemical Engineering,Liaoning Shihua University,Fushun 113001,China;Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区:[1]Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China [2]School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,China [4]School of Petrochemical Engineering,Liaoning Shihua University,Fushun 113001,China [5]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [6]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

出  处:《Science Bulletin》2021年第9期914-924,M0004,共12页科学通报(英文版)

基  金:supported by the National Natural Science Foundation of China (51677182 and 51822706);the Dalian National Laboratory for Clean Energy (DNL) Cooperation Fund, CAS (DNL201915 and DNL201912);the Beijing Municipal Science and Technology Commission (Z181100000118006);the Key Research Program of Frontier Sciences, CAS (ZDBS-LY-JSC047)。

摘  要:Two-dimensional(2 D)material MXenes have been intensively concerned in energy-storage field due to these unique properties of metallic-like conductivity,good hydrophilicity and high volumetric capacity.However,the self-restocking of ultra-thin 2 D materials seriously hinders these performances,which significantly inhibits the full exploitation of MXenes in the field of energy storage.To solve this issue,a strategy to prepare delaminated Ti_(3)C_(2)T_(x)(MXene)nanoflakes/reduced graphene oxide(r GO)composites is proposed using the electrostatic self-assembly between positively charged Ti_(3)C_(2)T_(x) with tetrabutylammonium ion(TBA+)modification and negatively charged graphene.The nanoflakes of Ti_(3)C_(2)T_(x)/rGO are well dispersed and arranged in a face-to-face structure to effectively alleviate the self-restacking and provide more electroactive sites for accessible of electrolyte ions.The prepared delaminated Ti_(3)C_(2)T_(x)/r GO anode shows a high reversible capacity up to 1394 m Ah g^(-1) at a current density of 50 m A g^(-1).Moreover,a lithium-ion capacitor(LIC)was assembled with delaminated Ti_(3)C_(2)T_(x)/r GO anode and activated carbon(AC)cathode which can exhibit a specific capacity of 70.7 F g^(-1) at a current density of 0.1 A g^(-1) and deliver an ultrahigh energy density of 114 Wh kg^(-1) at a relatively high power density of 3125 W kg^(-1).These good electrochemical performances demonstrate the potential of delaminated Ti_(3)C_(2)T_(x)/r GO as an anode material for lithium-ion capacitors.二维(2D)材料MXenes由于具有金属导电性以及种类丰富的表面终止基团,在储能材料领域得到广泛研究.MXenes片层之间存在空隙,能够提供快速的离子传输通道,实现高倍率性能,并且进一步剥离的MXenes能够提供更多的离子储存位点.然而,剥离的MXenes纳米片存在着严重的重新堆叠情况,导致电化学性能降低.为了解决该问题,本文提出了一种借助四丁基铵离子(TBA+)修饰,使均带负电的剥离Ti_(3)C_(2)T_(x)(MXenes)和氧化石墨烯(GO)纳米片通过静电自组装再退火的策略,制备结构稳定的Ti_(3)C_(2)T_(x)/rGO复合纳米材料.Ti_(3)C_(2)T_(x)与rGO纳米片以面对面的结构排布,分散均匀且能够缓解MXenes纳米片重新堆叠的情况,增大了电极材料的电化学活性面积,因此能够提供高的可逆比容量(1394 mAh g^(-1))和优越的倍率性能.同时与活性碳作为正极组装成锂离子电容器,能量密度最高可达145 Wh kg^(-1),循环5000次后的容量保持率>80%,充分证明了Ti_(3)C_(2)T_(x)/rGO作为锂离子电容器电极材料的潜力.

关 键 词:Lithium-ion capacitor Two-dimensional(2D)material MXenes Reduced graphene oxide(rGO) Energy density 

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

 

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