Synergistic enhancement of ion/electron transport by ultrafine nanoparticles and graphene in Li_(2)FeTiO_(4)/C/G nanofibers for symmetric Li-ion batteries  

作　　者：Wenjie Ma Yakun Tang Yue Zhang Xiaohui Li Lang Liu Xueting Wang Yuliang Cao 

机构地区：[1]State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,Key Laboratory of Energy Materials Chemistry,Ministry of Education,College of Chemistry,Xinjiang University,Urumqi 830017,Xinjiang,China [2]Colege of Chemistry and Molecular Sciences,Hubei Key Laboratory of Electrochemical Power Sources,Wuhan University,Wuhan 430072,Hubei,China

出　　处：《Journal of Energy Chemistry》2025年第2期42-51,I0002,共11页能源化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(22278347);the Excellent Doctoral Student Research Innovation Project of Xinjiang University of China(XJU2022BS048);the Postgraduate Innovation Project of Xinjiang Uygur Autonomous Region of China(XJ2023G027).

摘　　要：Low-cost Fe-based disordered rock salt(DRX)Li_(2)FeTiO_(4)is capable of providing high capacity(295 mA h g^(-1))by redox activity of cations(Fe^(2+)/Fe^(4+)and Ti^(3+)/Ti^(4+))and anionic oxygen.However,DRX structures lack transport channels for ions and electrons,resulting in sluggish kinetics,poor electrochemical activity,and cyclability.Herein,graphene conductive carbon network permeated Li_(2)FeTiO_(4)(LFT/C/G)nanofibers are successfully prepared by a facile sol-gel assisted electrospinning method.Ultrafine Li_(2)FeTiO_(4)nanoparticles(2 nm)and one-dimensional(1D)structure provide abu ndant active sites and unobstructed diffu sion channels,accelerating ion diffusion.In addition,introducing graphene reduces the band gap and Li^(+)diffusion barrier and improves the dynamic properties of Li_(2)FeTiO_(4),thus achieving a relatively mild interfacial reaction and reversible redox reaction.As expected,the LFT/C/1.0G cathode delivers a remarkable discharge capacity(238.5 mA h g^(-1)),high energy density(508.8 Wh kg^(-1)),and excellent rate capability(51.2 mA hg^(-1)at 1.0 A g^(-1)).Besides,the LFT/C/1.0G anode also displays a high capacity(514.5 mA h g^(-1)at 500 mA g^(-1))and a remarkable rate capability(243.9 mA h g^(-1)at 8 A g^(-1)).Moreover,the full batteries based on the LFT/C/1.0G symmetric electrode demonstrate a reversible capacity of 117.0 mA h g^(-1)after 100 cycles at 50 mA g^(-1).This study presents useful insights into developing cost-effective DRX cathodes with durable and fast lithium storage.

关 键 词：Disordered rock salt Li_(2)FeTiO_(4) GRAPHENE 1D structure Rapid ion/electron transport Lithium-ion battery electrode 

分 类 号：TG1[金属学及工艺—金属学]