Abstract
Searching for novel complex materials with enhanced lithium-ion battery performances is one of the most challenging efforts. Many kinds of transition metal oxides and polyanionic frameworks were developed with various structures, which can improve the energy density of lithium-ion batteries. In this work, we explored 4d and 4f transition metal La–Nb–O compounds as cathode materials for lithium-ion energy storage. Orthorhombic pyrochlore LaNb5O14, orthorhombic perovskite LaNb3O9, and monoclinic LaNbO4 compounds with different metal cation coordination polyhedra were synthesized using solid-state reaction. The orthorhombic pyrochlore LaNb5O14 compound showed the highest capacity among these La–Nb–O compounds owing to its quasi‐2D network for Li‐ion incorporation. According to the electronegativity theory and ionic size, La3+ cations can form LaO12 polyhedra and hexahedral LaO8 units in different La–Nb–O compounds, which can stabilize octahedral NbO6 and/or pentahedral NbO7 and their assembled structures, resulting in easy lithium-ion diffusion. This work may provide some structure clues for the design of electrode materials for fast lithium storage.
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21 August 2021
A Correction to this paper has been published: https://doi.org/10.1007/s42864-021-00115-4
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant No. 21601176), CAS-VPST Silk Road Science Found 2018 (Grant No. GJHZ1854), the Youth Innovation Promotion Association, CAS (Grant No. 2018262), Jilin Province Youth Talent Lifting Project (Grant No. 181901), and the Youth Talent Development Program of the State Key Laboratory of Rare Earth Resource Utilization (Grant No. RERUY2017004).
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Chen, K., Yin, S. & Xue, D. Active La–Nb–O compounds for fast lithium-ion energy storage. Tungsten 1, 287–296 (2019). https://doi.org/10.1007/s42864-019-00029-2
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DOI: https://doi.org/10.1007/s42864-019-00029-2