Nickel-rich transition metal oxides are the most promising high voltage and high capacity cathode materials for high energy density lithium batteries. Improving the chemical/electrochemical stability of the cathode electrolyte interface has been the major technical focus to enable this class of cathode materials. In order to investigate the chemical nature of the parasitic reactions at the interace of cathode materials, we have built a prototype high precision leakage current measurement system to quantitatively measure the rate of electron transfer reaction across the interface. In this work, LiCoO<sub>2</sub> is adopted as the model cathode material to investigate the active sites for parasitic reactions between the delithiated cathode and the non-aqueous electrolyte. Both <i>ab initio </i>calculations and experimental results clearly show that the partially coordinated transition metal atoms at the surface is responsible for the parasitic reactions at the cathode electrolyte interface.

Identifying active sites for parasitic reactions at cathode electrolyte interface

2019 Fall National Meeting

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