Abstract
Over-lithiated layered oxides (OLOs) are one of the promising positive electrode (PE) materials, however, the poor cycle-life of OLOs has to be resolved in order to make OLO cells available. In this work, several kind of additives are investigated to enhance the interfacial stability and the most efficient additive is 1,3-propanesultone (PS). According to spectroscopic analysis, it is found that the surface film derived from PS is effective in suppressing both metal dissolution and undesired reactions of the electrolyte on the PE, which results in remarkably enhanced cycle performance of the OLO electrode.
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