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Origin of the High Specific Capacity in Sodium Manganese Hexacyanomanganate

化学 离子 密度泛函理论 无机化学 氧化还原 格子(音乐) 结晶学 化学物理 计算化学 有机化学 声学 物理
作者
Kevin Hurlbutt,Feliciano Giustino,George Volonakis,Mauro Pasta
出处
期刊:Chemistry of Materials [American Chemical Society]
卷期号:34 (10): 4336-4343 被引量:14
标识
DOI:10.1021/acs.chemmater.1c04167
摘要

Sodium manganese hexacyanomanganate, NaxMn[Mn(CN)6], is an electrochemically active Prussian blue analogue (PBA) that has been studied experimentally as an electrode material in rechargeable sodium-ion batteries. It has a reversible specific capacity of 209 mA h g–1, which is substantially higher than the theoretical specific capacity of 172 mA h g–1 expected for two reduction events conventional in PBAs. It has been suggested that the high specific capacity originates from this compound's unique ability to insert a third sodium ion per formula unit. However, the plausibility of this mechanism has remained ambiguous. Here, we use density functional theory (DFT) with a hybrid functional to calculate the formation energies of various oxidation states and magnetic phases of the NaxMn[Mn(CN)6] system. We confirm that the compound Na3MnII[MnI(CN)6] is, indeed, thermodynamically stable. It contains manganese(I), and the sodium ions occupy the interfacial position of the lattice subcubes. We also provide strong evidence that the phase of the fully oxidized Mn[Mn(CN)6] compound is charge-disproportionated, containing manganese(II) and manganese(IV). We proceed to show that the presence of crystalline water increases the reduction potential of the system and that the hydrated compounds have theoretical crystal geometries and reduction potentials that closely match the experiment. This work clarifies the charge-storage mechanism in a well-known but less-understood PBA.
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