Advanced Energy Materials · 2023 · 102 citations · 52 references
Natural SciencesMaterials EngineeringMaterials ScienceInorganic ChemistryMaterials ChemistrySurface ChemistryBattery MaterialsCathode MaterialsElectrochemical CellsElectrode MaterialsElectrode-electrolyte InterfacesMetal OxidesCycling StabilityElectrolyte InterphaseLayered CathodesLayered Oxide CathodesLayered Transition Metal OxidesOxygen VacanciesPractical CapacitySide Reactions
Abstract Li‐rich layered oxides based on the anionic redox chemistry provide the highest practical capacity among all transition metal (TM) oxide cathodes but still struggle with poor cycling stability. Here, a certain amount of oxygen vacancies (OVs) are introduced into the ≈10 nm‐thick surface region of Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 through a long‐time medium‐temperature post‐annealing. These surficial enriched OVs significantly suppress the generation of O‐O dimers (O 2 n− , 0 < n < 4) and the associated side reactions, thus facilitating the construction of a uniform and compact cathode/electrolyte interphase (CEI) layer on the surface. The CEI layer then decreases the further side reactions and TM dissolution and protects the bulk structure upon cycling, eventually leading to enhanced cycling stability, demonstrated in both half cells and full cells. An in‐depth understanding of OVs is expected to benefit the design of stable cathode materials based on anionic redox chemistry.
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A. Robert Armstrong, Michael Holzapfel, Petr Novák et al. · Journal of the American Chemical Society · 2006 · 1.6K citations
Origin of voltage decay in high-capacity layered oxide electrodes
Artem M. Abakumov, Dominique Foix, Gwenaëlle Rousse et al. · Nature Materials · 2014 · 913 citations · Full text
Natural Sciences, Materials Engineering, Materials Science +14