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Origin of stabilization and destabilization in solid-state redox reaction of oxide ions for lithium-ion batteries

机译:锂离子电池氧化物离子的固态氧化还原反应中稳定和不稳定的起源

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Further increase in energy density of lithium batteries is needed for zero emission vehicles. However, energy density is restricted by unavoidable theoretical limits for positive electrodes used in commercial applications. One possibility towards energy densities exceeding these limits is to utilize anion (oxide ion) redox, instead of classical transition metal redox. Nevertheless, origin of activation of the oxide ion and its stabilization mechanism are not fully understood. Here we demonstrate that the suppression of formation of superoxide-like species on lithium extraction results in reversible redox for oxide ions, which is stabilized by the presence of relatively less covalent character of Mn4+ with oxide ions without the sacrifice of electronic conductivity. On the basis of these findings, we report an electrode material, whose metallic constituents consist only of 3 d transition metal elements. The material delivers a reversible capacity of 300?mAh?g?1 based on solid-state redox reaction of oxide ions.
机译:零排放车辆需要进一步提高锂电池的能量密度。然而,能量密度受到用于商业应用的正电极不可避免的理论极限的限制。能量密度超过这些限制的一种可能性是利用阴离子(氧化物离子)氧化还原代替传统的过渡金属氧化还原。然而,对氧化物离子的活化的起因及其稳定机理尚未完全了解。在这里,我们证明了抑制锂萃取过程中超氧化物类物质的形成导致了可逆的氧化还原,这通过相对较少的Mn 4 + 共价特征与氧化离子的存在而得以稳定。电子导电性的牺牲。基于这些发现,我们报告了一种电极材料,其金属成分仅由3d过渡金属元素组成。基于氧化物离子的固态氧化还原反应,该材料可逆容量为300?mAh?g ?1

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