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Clear All- Zachary Lebens-Higgins; Nicholas Faenza; Pinaki Mukherjee; Shawn Sallis; Fadwa Badway; Nathalie Pereira; Christoph Schlueter; Tien-Lin Lee; Frederic Cosandey; Glenn Amatucci;
Louis F.J. Piper; Louis F.J. Piper
Derived by OpenAIRE algorithms or harvested from 3rd party repositoriesLouis F.J. Piper in OpenAIREFor layered oxide cathodes, aluminum doping has widely been shown to improve performance, particularly at high degrees of delithiation. While this has led to increased interest in Al-doped systems, including $\mathrm{LiNi_{0.8}Co_{0.15}Al_{0.05}O_{2}}$ (NCA), the aluminum surface environment has not been thoroughly investigated. Using hard x-ray photoelectron spectroscopy measurements of the Al 1s core region for NCA electrodes, we examined the evolution of the surface aluminum environment under electrochemical and thermal stress. By correlating the aluminum environment to transition metal reduction and electrolyte decomposition, we provide further insight into the cathode-electrolyte interface layer. A remarkable finding is that Al-O coatings in LiPF$_6$ electrolyte mimic the evolution observed for the aluminum surface environment in doped layered oxides. ECS transactions 80(10), 197 - 206 (2017). doi:10.1149/08010.0197ecst Published by Pennington, NJ
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