Abstract
Lithium-ion batteries are the most promising and reliable candidate to be adopted by the electric vehicle industry. In order to be widely used in the electric vehicle industry, there is a growing demand for material that delivers high capacity and high energy density. LiNi0.8Co0.1M0.1O2 (NCM 811) with a layered structure has attracted a significant interest as a cathode material due to its ability to supply a high capacity. Although, the increased Ni content in the NCM 811 results in delivering a higher capacity, it has reduced cycling stability at elevated temperatures and voltages. Active material degradation, phase changes and cation mixing are some of the underlying causes for cycling instabilities in Ni rich NCM811. One method for improving the performance of NCM 811 at high temperature and elevated temperatures involves the incorporation of electrolyte additives that are sacrificially oxidized on the surface of the electrode to generate a passivation film in stabilizing the surface. In this study, the role of a novel additive in improving the long term and high temperature performance of NCM811/Li cells has been investigated. Combination of X-ray photoelectron spectroscopy and ATR_IR has been used to characterize the differences of surface films generated with the additive.
Published Version
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