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

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

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Niobium pentoxide(Nb2O5)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 Nb2O5 crystals.To increase the capacity of Nb2O5 and alleviate the lattice distortion caused by stress,numerous homogeneous H-and M-phases junction interfaces were proposed to produce coercive stress within the Nb2O5 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 intercala-tion.Therefore,the synthesized Nb2O5 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).

Niobium pentoxideHomojunction polycrystallineDefectsOxygen vacancy

Huibin Ding、Yang Luo、Zihan Song、Cong Chen、Kai Feng、Xiaofei Yang、Hongzhang Zhang、Xianfeng Li

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Division of Energy Storage,National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

University of Chinese Academy of Sciences,Beijing 100049,China

College of Chemistry & Engineering,Yantai University,Yantai 264005,Shandong,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYouth Innovation Promotion Association of CASYouth Innovation Promotion Association of CASYouth Innovation Foundation of DICPYouth Innovation Foundation of DICPDalian Outstanding Young Scientific TalentNational Key Research and Development Project

5167319951972301516771762015148Y201940ZZBS201615ZZBS2017082018RJ032019YFA0705600

2024

10.1016/j.jechem.2024.01.057

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.92(5)