Spatially confined synthesis of TiNb_(2)O_(7)quantum dots onto mesoporous carbon and Ti_(3)C_(2)T_(X)MXene for boosting lithium storage  

作　　者：Daoguang Sun Cheng Tang Haitao Li Xinlin Zhang Guanjia Zhu Zhen-Dong Huang Aijun Du Haijiao Zhang 

机构地区：[1]Institute of Nanochemistry and Nanobiology,School of Environmental and Chemical Engineering,Shanghai University,Shanghai,200444,China [2]School of Chemistry and Physics and Centre for Materials Science,Queensland University of Technology,Brisbane,QLD,4001,Australia [3]State Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors,Institute of Advanced Materials(IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing University of Posts and Telecommunications,9 Wenyuan Road,Nanjing,210023,China

出　　处：《Green Energy & Environment》2025年第2期358-366,共9页绿色能源与环境(英文版)

基　　金：support from the Natural Science Foundation of Shanghai(23ZR1423800),Shuguang Program supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(18SG35);Open Research Fund of Shanghai Key Laboratory of Green Chemistry and Chemical Processes(East China Normal University);Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University.

摘　　要：TiNb_(2)O_(7)has been emerged as one of the most promising electrode materials for high-energy lithium-ion batteries.However,limited by the slow electron/ion transport kinetics,and insufficient active sites in the bulk structure,the TiNb_(2)O_(7)electrode still suffers from unsatisfactory lithium storage performance.Herein,we demonstrate a spatially confined strategy toward a novel TiNb_(2)O_(7)-NMC/MXene composite through a triblock copolymer-directed one-pot solvothermal route,where TiNb_(2)O_(7)quantum dots with a particle size of 2-3 nm are evenly embedded into N-doped mesoporous carbon(NMC)and Ti_(3)C_(2)T_(X)MXene.Impressively,the as-prepared TiNb_(2)O_(7)-NMC/MXene anode exhibits a high reversible capacity(486.2 mAh g^(-1)at 0.1 A g^(-1)after 100 cycles)and long cycle lifespan(363.4 mAh g^(-1)at ss1 A g^(-1)after 500 cycles).Both experimental and theorical results further demonstrate that such a superior lithium storage performance is mainly ascribed to the synergistic effect among 0D TiNb_(2)O_(7)quantum dots,2D Ti_(3)C_(2)T_(X)MXene nanosheets,and N-doped mesoporous carbon.The strategy presented also opens up new horizon for space-confined preparation of high-performance electrode materials.

关 键 词：TiNb_(2)O_(7)quantum dots Ti_(3)C_(2)T_(X)MXene Mesoporous carbon Confined synthesis Lithium-ion batteries 

分 类 号：O64[理学—物理化学]