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Origin of stabilization and destabilization in solid-state redox reaction of oxide ions for lithium-ion batteries
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Origin of stabilization and destabilization in solid-state redox reaction of oxide ions for lithium-ion batteries
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Journal Article
Origin of stabilization and destabilization in solid-state redox reaction of oxide ions for lithium-ion batteries
2016
Overview
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 Mn
4+
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.
Energy storage by metal redox reactions sets strict limits on capacity in metal oxide cathode materials used in lithium-ion batteries. Here authors study stabilization of redox reactions at oxygen sites and demonstrate a cathode with a high reversible capacity enabled by the process.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
