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Insights into Micromorphological Effects of Cation Disordering on Co-Free Layered Oxide Cathodes

机译：Insights into Micromorphological Effects of Cation Disordering on Co-Free Layered Oxide Cathodes

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摘要

Controlling Li/Ni disordering has always been a priority in designing Co-freelayered oxide cathodes. The Li/Ni disordering is an atomic-scale structuraldefect that has been extensively studied by macroscopic statistical characterizations.Significantly less is known about its microstructure in the layeredstructure and correlations with electrochemical performance. In this work,combining multiscale structural characterizations, it is found that Li/Ni disorderingsurprisingly takes various microstructural forms in Co-free layeredcathodes. Li/Ni disordering at insufficient calcination temperature tends tomanifest as localized rock salt nanodomain in the layered structure. However,an excessively high calcination temperature causes Li/Ni disordering as amassive rock salt phase inside the particles. Only at an appropriate calcinationtemperature, the Li/Ni disordering is present in the layered structure asthe form of well-known anti-site defects. These microstructural differenceslead to widely varying electrochemical performance, and an in-depth structure-performance connection is built. Besides, the above results also reflectthat more careful and precise control of experimental conditions is requiredto synthesize Co-free layered cathodes. These findings may inspire the designof novel Co-free cathodes and light the way forward.

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