Cationic intermediates assisted self-assembly two-dimensional Ti3C2Tx/rGO hybrid nanoflakes for advanced lithium-ion capacitors

• 作者: Sha Yi Lei Wang Xiong Zhang Chen Li Weniie Liu Kai Wang Xianzhong Sun Yanan Xu Zhanxu Yang Yu Cao Jie Sun Yanwei Ma
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（9）
• 所属期刊栏目: ARTICLES
• 页码范围: 914-924
• 页数: 11页
• 语种: 英文

摘要

Two-dimensional (2D) 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 2D 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 Ti3C2Tx (MXene) nanoflakes/reduced graphene oxide (rGO) composites is proposed using the electrostatic self-assembly between positively charged Ti3C2Tx with tetrabutylammonium ion (TBA+) modification and negatively charged graphene.The nanoflakes of Ti3C2Tx/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 Ti3C2Tx/rGO anode shows a high reversible capacity up to 1394 mAh g-1 at a current density of 50 mA g-1.Moreover,a lithium-ion capacitor (LIC) was assembled with delaminated Ti3C2Tx/rGO 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 Ti3C2Tx/rGO as an anode material for lithium-ion capacitors.