Li5Cr7Ti6O25 is regarded as a promising anode material for Li-ion batteries(LIBs)because of its low cost and high theoretical capacity.However,the inherently poor conductivity significantly limits the enhance-ment of its rate capability and cycling stability,especially at high current densities,In this work,we con-struct one-dimensional Li5Cr7Ti6O25/C nanofibers by electrospinning method to enhance the kinetic,which realizes high cycling stability.Carbon coating enhances the structure stability,insertion/extraction reversibility of Li-ions and electrochemical reaction activity,and facilitates the transfer of Li-ions.Benefited from the unique architecture and component,the Li5Cr7Ti6O25/C(6.6 wt％)nanofiber shows an excellent rate capability with a reversible de-lithiation capacity of 370.8,290.6,269.2,254.3 and 244.9 mAh g-1 at 200,300,500,800 and 1000 mA g-1,respectively.Even at a higher current density of 1 A g-1,Li5Cr7Ti6O25/C(6.6 wt％)nanofiber shows high cycling stability with an initial de-lithiation capacity of 237.8 mAh g-1 and a capacity retention rate of about 84％after 500 cycles.The density func-tional theory calculation result confirms that the introduction of carbon on the surface of Li5Cr7Ti6O25 changes the total density of states of Li5Cr7Ti6O25,and thus improves electronic conductivity of the com-posite,resulting in a good electrochemical performance of Li5Cr7Ti6O25/C nanofibers.Li5Cr7Ti6O25/C nano-fibers indicate a great potential as an anode material for the next generation of high-performance LIBs.

School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;School of Resources and Materials,Northeastern University at Qjnhuangdao,Qinhuangdao 066004,Hebei,China;Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,Qinhuangdao 066004,Hebei China;Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education,School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,Heilongjiang,China

[1]Ting-Ting Wei;Panpan Peng;Yu-Rui Ji;Yan-Rong Zhu;Ting-Feng Yi;Ying Xie-.Rational construction and decoration of Li5Cr7Ti6O25@C nanofibers as stable lithium storage materials)[J].能源化学,2022(08):400-410

Li5Cr7Ti6O25

Rational,construction,decoration,nanofibers,as,stable,lithium,storage,materials,regarded,promising,anode,batteries,LIBs,because,low,cost,theoretical,capacity,However,inherently,poor,conductivity,significantly,limits,ment,rate,capability,cycling,stability,especially,current,densities,In,this,work,dimensional,by,electrospinning,method,kinetic,which,realizes,Carbon,coating,enhances,structure,insertion,extraction,reversibility,ions,electrochemical,reaction,activity,facilitates,transfer,Benefited,from,unique,architecture,component,wt,shows,excellent,reversible,lithiation,mAh,respectively,Even,higher,density,initial,retention,about,after,cycles,func,theory,calculation,confirms,that,introduction,carbon,surface,changes,total,states,thus,improves,electronic,posite,resulting,good,performance,indicate,great,potential,next,generation

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