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Electrochemical and Thermal Stress of LiNi 0.8 Co 0.15 Al 0.05 O 2 Electrodes: Evolution of Aluminum Surface Environments

DOI: 10.1149/08010.0197ecst DOI Help

Authors: Zachary W. Lebens-higgins (NECCES at Binghamton University) , Nicholas Faenza (NECCES at Rutgers University) , Pinaki Mukherjee (NECCES at Rutgers University) , Shawn Sallis (NECCES at Binghamton University) , Fadwa Badway (Rutgers University) , Nathalie Pereira (NECCES at Rutgers University) , Christoph Schlueter (DESY Photon Science) , Tien-lin Lee (Diamond Light Source) , Frederic Cosandey (NECCES at Rutgers University) , Glenn Amatucci (NECCES at Rutgers University) , Louis F. J. Piper (NECCES at Binghamton University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Ecs Transactions , VOL 80 , PAGES 197 - 206

State: Published (Approved)
Published: December 2017

Abstract: For 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 LiNi0.8Co0.15Al0.05O2 (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 LiPF6 electrolyte mimic the evolution observed for the aluminum surface environment in doped layered oxides.

Subject Areas: Physics, Materials


Instruments: I09-Surface and Interface Structural Analysis