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Role of intermediate phase for stable cycling of Na7V4(P2O7)(4)PO4 in sodium ion battery

Cited 121 time in Web of Science Cited 123 time in Scopus
Issue Date
2014-01
Citation
Proceedings of the National Academy of Sciences of the United States of America, Vol.111 No.2, pp.599-604
Keywords
cathodesingle voltageatomic reorganizationab initio calculation
Abstract
Sodium ion batteries offer promising opportunities in emerging utility grid applications because of the low cost of raw materials, yet low energy density and limited cycle life remain critical drawbacks in their electrochemical operations. Herein, we report a vanadium-based ortho-diphosphate, Na7V4(P2O7)(4)PO4, or VODP, that significantly reduces all these drawbacks. Indeed, VODP exhibits single-valued voltage plateaus at 3.88 V vs. Na/Na+ while retaining substantial capacity (> 78%) over 1,000 cycles. Electronic structure calculations reveal that the remarkable single plateau and cycle life originate from an intermediate phase (a very shallow voltage step) that is similar both in the energy level and lattice parameters to those of fully intercalated and deintercalated states. We propose a theoretical scheme in which the reaction barrier that arises from lattice mismatches can be evaluated by using a simple energetic consideration, suggesting that the presence of intermediate phases is beneficial for cell kinetics by buffering the differences in lattice parameters between initial and final phases. We expect these insights into the role of intermediate phases found for VODP hold in general and thus provide a helpful guideline in the further understanding and design of battery materials.
ISSN
0027-8424
URI
https://hdl.handle.net/10371/164621
DOI
https://doi.org/10.1073/pnas.1316557110
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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