Na2Li2Ti6O14 as a reliable anode material is becoming a hopeful candidate for Li-ion battery.Nevertheless,the pristine Na2Li2Ti6O14 usually suffer from bad rate performance and poor cycling stability under high current due to limited dif-fusion kinetics and poor electrical conductivity.Here,the PPy-coated Na2Li2Ti6O14 composites are successfully obtained via the solid-state method and followed by chemical oxidation process in the first time.The results of tests prove that the Na2Li2Ti6O14@PPy composites have better electrochemical performance than the bare Na2Li2Ti6O14 because of the excel-lent electrical conductivity and the special macromolecular architecture of PPy.In particular,the Na2Li2Ti6O14@PPy(4 wt％)exhibits excellent charge capacities of about 223.2,218.0,200.8,184.3 and 172.6 mAh g-1 at 50,100,200,300 and 500 mA g-1,respectively,revealing the best rate capability of all electrode materials.The Na2Li2Ti6O14@PPy(4 wt％)not only has the highest charge capacity under 0.5 mA g-1,but also has the highest capacity retention of 85.12％among all samples after 100 loops.Hence,the PPy coating is known as a promising way to improve the electrochemical property of Na2Li2Ti6O14.The PPy-coated Na2Li2Ti6O14 demonstrates the great prospect as promising negative materials for Li-ion batteries.

Fan-Fan Wang;Nan Zhang;Ze-Chen Lv;Yan-Rong Zhu;Jun-Hong Zhang;Ting-Feng Yi

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

金属学报（英文版）

[1]Fan-Fan Wang;Nan Zhang;Ze-Chen Lv;Yan-Rong Zhu;Jun-Hong Zhang;Ting-Feng Yi-.PPy-Encapsulated Na2Li2Ti6O14 Composites as High-Performance Anodes for Li-Ion Battery)[J].金属学报（英文版）,2022(11):1873-1881

Na2Li2Ti6O14

PPy,Encapsulated,Composites,High,Performance,Anodes,Ion,Battery,reliable,anode,becoming,hopeful,candidate,battery,Nevertheless,pristine,usually,suffer,from,bad,performance,poor,cycling,stability,under,current,due,limited,dif,fusion,kinetics,electrical,conductivity,Here,coated,composites,successfully,obtained,via,solid,state,method,followed,by,oxidation,process,first,results,tests,that,have,better,electrochemical,than,bare,because,special,macromolecular,architecture,In,particular,wt,exhibits,excellent,charge,capacities,about,mAh,respectively,revealing,best,capability,electrode,materials,not,only,has,highest,capacity,but,also,retention,among,samples,after,loops,Hence,coating,known,promising,way,improve,property,demonstrates,great,prospect,negative,batteries

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