Post-annealing tailored 3D cross-linked TiNb2O7 nanorod electrode: towards superior lithium storage for flexible lithium-ion capacitors

作     者：Bohua Deng Haoyang Dong Tianyu Lei Ning Yue Liang Xiao Jinping Liu 邓伯华;董浩洋;雷田雨;岳宁;肖亮;刘金平

作者机构：School of ChemistryChemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2020年第63卷第4期

页      面：492-504页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China (51672205, 21673169 and 51972257) the National Key R&D Program of China (2016YFA0202602) the Natural Science Foundation of Hubei Province (2018CFB581) 

主　　题：post-annealing cross-linked nanorods facile electron transport superior rate performance flexible Li-ion capacitors 

摘      要：TiNb2O7 anode materials(TNO)have unique potential for applications in Li-ion capacitors(LICs)due to their high specific capacity of ca.280 mA h g^-1 over a wide anodic Li-insertion potential ***,their highrate capability is limited by their poor electronic and ionic *** particular,studies on TNO for LICs are lacking and that for flexible LICs have not yet been ***,a unique TNO porous electrode with cross-linked nanorods tailored by post-annealing and its application in flexible LICs are *** binder-free TNO anode exhibits superior rate performance(~66.3%capacity retention as the rate increases from 1 to 40 C),which is ascribed to the greatly shortened ion-diffusion length in TNO nanorods,facile electrolyte penetration and fast electron transport along the continuous single-crystalline nanorod ***,the TNO anode shows an excellent cycling stability up to 2000 cycles and good flexibility(no capacity loss after continuous bending for 500 times).Model flexible LIC assembled with the TNO anode and activated carbon cathode exhibits increased gravimetric and volumetric energy/power densities(~100.6 W h kg^-1/4108.8 W kg^-1;10.7 mW h cm^-3/419.3 mW cm^-3),more superior to previously reported hybrid *** device also efficiently powers an LED light upon 180°bending.