Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 50, Issue 4, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6463/aa518d
Keywords
DFT method; battery; neb method; Bader population
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Based on first principles calculations, we investigate the geometry, electronic structure, and diffusion mechanism of Na ions in Na3MnPO4CO3 using density functional theory with a Hubbard potential correction. Our results suggest that the structure of Na3MnPO4CO3 can be deintercalated with more than one Na ion, and that the removal of a Na ion can form a bound polaron. We find that our calculations of the intercalation voltages for the redox couples Mn2+/Mn3+ and Mn3+/Mn4+ agree very well with the experimental data. In addition, we demonstrate that Na in Na3MnPO4CO3 can diffuse in three directions with low activation energy barriers, allowing a fast charging rate.
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