Preparation of Water-Resistant Surface Coated High-Voltage LiNi0.5Mn1.5O4 Cathode and Its Cathode Performance to Apply a Water-Based Hybrid Polymer Binder to Li-Ion Batteries

The coated LiNi_0.5Mn_1.5O₂ particles not only exhibited water-resistant property but also showed no decrease in discharge capacity and only a small degradation of discharge rate performance. In addition, the coated LiNi_0.5Mn_1.5O₂ particles, that were exposed to water-based binder solution for one week, exhibited the same charge/discharge cycle performance as observed for the cathode of the pristine LiNi_0.5Mn_1.5O₄ particles, suggesting that the coated particles are promising as cathode materials with a water-resistant property and therefore water can be used as solvent for preparing the cathode slurry solution in the place of e.g., carcinogenic N-methyl-2-pyrrolidone which is used actually.

Actually, no coating is required anymore since the newest polymer binder BA-310C is generating the same electrochemical performance for a battery cell. BA-310C  is a new eco-friendly non-toxic water-based binder for Li-ion Battery Cathode. It can deliver the most excellent adhesion to the active materials as well as the Aluminium foil. It will generate excellent flexibility for the electrodes which is good for cylindrical cell production. It also effectively solve the problem which frequently happens in electrode production such as powder-off, falling-off, and cracking, etc.  The good mechanical stability, thermal stability, alkali resistance, and freeze-thaw stability make transportation and processing easier!

Preparation of Water-Resistant Surface Coated High-Voltage LiNi_0.5Mn_1.5O₄ Cathode and Its Cathode Performance to Apply a Water-Based Hybrid Polymer Binder to Li-Ion Batteries

Abstract

Water-resistant LiNi_0.5Mn_1.5O₂ spinel cathode was prepared by surface coating with carbon, Al₂O₃ and Nb₂O₅ to use a water-based hybrid polymer (TRD202A, JSR, Japan) as a binder and to form the cathode film on an Al current collector. The surface composition and degree of the surface coverage of carbon, Al₂O₃ and Nb₂O₅ were characterized with field-emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The coated LiNi_0.5Mn_1.5O₂ particles not only exhibited water-resistant property but also showed no decrease in discharge capacity and only a small degradation of discharge rate performance. In addition, the coated LiNi_0.5Mn_1.5O₂ particles, that were exposed to water-based binder solution for one week, exhibited the same charge/discharge cycle performance as observed for the cathode of the pristine LiNi_0.5Mn_1.5O₄ particles, suggesting that the coated particles are promising as cathode materials with a water-resistant property and therefore water can be used as solvent for preparing the cathode slurry solution in the place of e.g., carcinogenic N-methyl-2-pyrrolidone which is used actually.