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나노입자 연구단
나노입자 연구단
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Anomalous Jahn-Teller behavior in a manganese-based mixed-phosphate cathode for sodium ion batteries

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Title
Anomalous Jahn-Teller behavior in a manganese-based mixed-phosphate cathode for sodium ion batteries
Author(s)
Hyungsub Kim; Gabin Yoon; Inchul Park; Kyu-Young Park; Byungju Lee; Kim, J.; Park, Y.-U.; Sung-Kyun Jung; Lim, H.-D.; Ahn, D.; Lee, S.; Kisuk Kang
Publication Date
2015-11
Journal
ENERGY & ENVIRONMENTAL SCIENCE, v.8, no.11, pp.3325 - 3335
Publisher
ROYAL SOC CHEMISTRY
Abstract
We report a 3.8 V manganese-based mixed-phosphate cathode material for applications in sodium rechargeable batteries; i.e., Na4Mn3(PO4)2(P2O7). This material exhibits a largest Mn2+/Mn3+ redox potential of 3.84 V vs. Na+/Na yet reported for a manganese-based cathode, together with the largest energy density of 416 W h kg-1. We describe first-principles calculations and experimental results which show that three-dimensional Na diffusion pathways with low-activation-energy barriers enable the rapid sodium insertion and extraction at various states of charge of the Na4-xMn3(PO4)2(P2O7) electrode (where x = 0, 1, 3). Furthermore, we show that the sodium ion mobility in this crystal structure is not decreased by the structural changes induced by Jahn-Teller distortion (Mn3+), in contrast to most manganese-based electrodes, rather it is increased due to distortion, which opens up sodium diffusion channels. This feature stabilizes the material, providing high cycle stability and high power performance for sodium rechargeable batteries. The high voltage, large energy density, cycle stability and the use of low-cost Mn give Na4Mn3(PO4)2(P2O7) significant potential for applications as a cathode material for large-scale Na-ion batteries. © 2015 The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/2260
ISSN
1754-5692
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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