Built defects of homogeneous junction to enhance the lithium storage capacity of niobium pentoxide materials  

作　　者：Huibin Ding Yang Luo Zihan Song Cong Chen Kai Feng Xiaofei Yang Hongzhang Zhang Xianfeng Li 

机构地区：[1]Division of Energy Storage,National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]College of Chemistry&Engineering,Yantai University,Yantai 264005,Shandong,China

出　　处：《Journal of Energy Chemistry》2024年第5期730-737,共8页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51673199,51972301,51677176);the Youth Innovation Promotion Association of CAS(2015148,Y201940);the Youth Innovation Foundation of DICP(ZZBS201615,ZZBS201708);the Dalian Outstanding Young Scientific Talent(2018RJ03);the National Key Research and Development Project(2019YFA0705600)。

摘　　要：Niobium pentoxide(Nb_(2)O_(5))is deemed one of the promising anode materials for lithium-ion batteries(LIBs)for its outstanding intrinsic fast Li-(de)intercalation kinetics.The specific capacity,however,is still limited,because the(de)intercalation of excessive Li-ions brings the undesired stress to damage Nb_(2)O_(5) crystals.To increase the capacity of Nb_(2)O_(5) and alleviate the lattice distortion caused by stress,numerous homogeneous H-and M-phases junction interfaces were proposed to produce coercive stress within theNb_(2)O_(5)crystals.Such interfaces bring about rich oxygen vacancies with structural shrinkage tendency,which pre-generate coercive stress to resist the expansion stress caused by excessive Li-ions intercalation.Therefore,the synthesized Nb_(2)O_(5) achieves the highest lithium storage capacity of 315 mA h g−1 to date,and exhibits high-rate performance(118 mA h g^(-1) at 20 C)as well as excellent cycling stability(138 mA h g^(-1) at 10 C after 600 cycles).

关 键 词：Niobiumpent oxide Homojunction polycrystalline DEFECTS Oxygen vacancy 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ135.12[化学工程—无机化工]