Abstract
Layered-layered composites with composition xLi2MnO3•(1-x)LiMO2 enable high capacity and energy density Li-ion batteries, but suffer from degradation with cycling. Evidence of atomic instabilities during the first charge are discussed based X-ray absorption spectroscopy, first principles simulation, and existing literature. EXAFS measurements on 0.3Li2MnO3•0.7LiMn0.5Ni0.5O2 during the first charge were analyzed to determine the coordination number deficit of Mn and Ni.
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