In this work,we construct Na2Li2Ti6O14@LiAlO2(NLTO-L)composites by a simple ball milled process and post-calcination in air atmosphere to improve the electrochemical performance.The thickness of the LiAlO2 coating layer is approximate 2 nm.The morphology and particle size of Na2Li2Ti6O14 are not dramatically altered after LiAlO2 coating.All samples display similar particles with a size range from 150 to 500 nm.The LiAlO2 coating can supply fast charge transmission paths with good insertion/extraction dynamics of lithium ions and provide an excellent rate performance and cycle perfor-mance of as-prepared Na2Li2Ti6O14@LiAlO2 anodes.Therefore,LiAlO2 coating efficiently enhances the rate performance and cycle performance of Na2Li2Ti6O14 anode,even at large current densities.As a result,Na2Li2Ti6O14@LiAlO2(5 wt％)reveals remarkable rate properties with reversible charge capacity of 238.7,214.7,185.8,168.5 and 139.8 mAh g-1 at 50,100,200,300 and 500 mA g-1,respectively.Na2Li2Ti6O14@LiAlO2(5 wt％)also possesses a good cycle performance with a de-lithiation capacity of 166.5 mAh g-1 at 500 mA g-1 after 200 cycles.Nonetheless,the corresponding de-lithiation capacity of pure Na2Li2Ti6O14 is only 140.1 mAh g-1.Consequently,LiAlO2 coating is an efficient approach to enhance the electrochemical performances of Na2Li2Ti6O14.

Nan Zhang;Ze-Chen Lv;Yu-Shen Zhao;Jun-Hong Zhang;Yan-Rong Zhu;Ting-Feng Yi

School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology,College of Chemistry and Chemical Engineering,Liaocheng University,Liaocheng 252059,China;School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;Key Laboratory of Dielectric,Electrolyte Functional Material Hebei Province,Qinhuangdao 066004,China

金属学报（英文版）

[1]Nan Zhang;Ze-Chen Lv;Yu-Shen Zhao;Jun-Hong Zhang;Yan-Rong Zhu;Ting-Feng Yi-.Construction of Na2Li2Ti6O14@LiAlO2 Composites as Anode Materials of Lithium-Ion Battery with High Performance)[J].金属学报（英文版）,2022(12):2047-2056

Na2Li2Ti6O14,NLTO

Construction,LiAlO2,Composites,Anode,Materials,Lithium,Ion,Battery,High,Performance,In,this,work,we,construct,composites,by,simple,ball,milled,process,post,calcination,air,atmosphere,improve,electrochemical,thickness,coating,layer,approximate,morphology,size,not,dramatically,altered,after,All,samples,display,similar,particles,range,from,can,supply,fast,charge,transmission,paths,good,insertion,extraction,dynamics,lithium,ions,provide,excellent,rate,prepared,anodes,Therefore,efficiently,enhances,even,large,current,densities,result,wt,reveals,remarkable,properties,reversible,capacity,mAh,respectively,also,possesses,lithiation,cycles,Nonetheless,corresponding,pure,only,Consequently,approach,performances

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