(General Student Poster Session Winner - 1st Place Solid-State) Synthesis of Water-Resistant thin TiOx Layer-Coated High-Capacity LiNiaCobAl1-a-BO2 (a > 0.85) Cathode and Its Stable Charge/Discharge Cycle Cathode Performance to Apply a Water-Based Hybrid Polymer Binder to Li-Ion Batteries

Tuesday, 3 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
Y. Liu, T. Tanabe, K. Miyamoto (Kanagawa University), Y. Irii, F. Maki (Nihon Kagaku Sango Co., Ltd.), T. Gunji, S. Kaneko (Kanagawa University), S. Ugawa, H. J. Lee (JSR Corporation), T. Ohsaka, and F. Matsumoto (Kanagawa University)
Titanium oxide (TiOx) coating was treated on a surface of A LiNiaCobAl1-a-bO2 (a > 0.85) cathode material, which exhibited high capacity of 200 mAhg-1 and however, the charge/discharge capacity with pristine LiNiaCobAl1-a-bO2 degraded seriously after contacting with water. The formation of TiOx layer on the cathode material surface was characterized with field-emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The TiOx-coated LiNiaCobAl1-a-bO2 cathode material did not form bubbles in the coating process when a water-based slurry was prepared with TiOx-coated LiNiaCobAl1-a-bO2 particles and a water-based hybrid polymer binder, and then the slurry was coated on a aluminum current collector. Therefore, the cathode electrode fabricated with TiOx-coated LiNiaCobAl1-a-bO2 exhibited comparable cycle and rate performance with the cathode which was composed of pristine LiNiaCobAl1-a-bO2 particle and organic solvent-based PVdF binder even after it was exposed in the water-based slurry for 7 days.