![]() Anionic redox processes for electrochemical devices. Electron paramagnetic resonance imaging for real-time monitoring of Li-ion batteries. The structural and chemical origin of the oxygen redox activity in layered and cation-disordered Li-excess cathode materials. Charge-compensation in 3 d-transition-metal-oxide intercalation cathodes through the generation of localized electron holes on oxygen. ![]() Understanding the roles of anionic redox and oxygen release during electrochemical cycling of lithium-rich layered Li 4FeSbO 6. Visualization of O–O peroxo-like dimers in high-capacity layered oxides for Li-ion batteries. Reversible anionic redox chemistry in high-capacity layered-oxide electrodes. ![]() Moreover, this study provides an insightful guide to designing high-capacity cathodes with reversible oxygen redox activity by simply introducing oxygen ions that are exclusively coordinated by Li +. These anionic and cationic redox reactions show high reversibility without any obvious O 2 gas release. During the removal of the first two Li ions, the oxidation potential of O 2− is lowered to approximately 3.5 V versus Li +/Li 0, at which potential the cationic oxidation occurs concurrently. Here we report simultaneous iron and oxygen redox activity in a Li-rich anti-fluorite Li 5FeO 4 electrode. However, it is still challenging to develop a cathode, especially with Earth-abundant elements, that enables anionic redox activity for real-world applications, primarily due to limited strategies to intercept the oxygenates from further irreversible oxidation to O 2 gas. ![]() Anionic redox reactions in cathodes of lithium-ion batteries are allowing opportunities to double or even triple the energy density. ![]()
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