A first principles study of spinel ZnFe2O4 for electrode materials in lithium-ion batteries

Literature Information

Publication Date 2017-09-06
DOI 10.1039/C7CP04590E
Impact Factor 3.676
Authors

Haoyue Guo, Yiman Zhang


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Abstract

Zinc ferrite (ZnFe2O4) is a prospective lithium ion battery (LIB) material, owing to its large theoretical capacity (1000 mA h gāˆ’1). Here, we report a density functional study of the discharge process at an early stage from ZnFe2O4 up to LixZnFe2O4 (x = 2), aiming to provide a fundamental understanding of the mechanism. According to our calculations, with x increasing up to 1 the intercalation of Li+ ions prefers octahedral 16c sites, which is accompanied by Zn2+ ion displacement from tetrahedral 8a sites to 16c sites starting at x = 0.25 and a gain in stability, while the stability decreases for 1 < x ≤ 2 due to the occupation of Li+ ions at the less active tetrahedral 8a/48f/8b sites. The open-circuit voltages estimated based on the structures of stable intermediates identified by DFT calculations are in good agreement with the experimental values. Our results highlight the importance of the interplay among Li, O2āˆ’, Fe3+ and Zn2+ in enabling their high performance as LIB materials.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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