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 

作者机构：Division of Energy StorageNational Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of SciencesBeijing 100049China College of Chemistry&EngineeringYantai UniversityYantai 264005ShandongChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2024年第92卷第5期

页      面：730-737页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

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)。 

主　　题：Niobiumpent oxide Homojunction polycrystalline Defects Oxygen vacancy 

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).