Preparation of Water-Resistant Surface Coated High-Voltage LiNi^sub 0.5^Mn^sub 1.5^O^sub 4^ Cathode and Its Cathode Performance to Apply a Water-Based Hybrid Polymer Binder to Li-Ion Batteries

Water-resistant LiNi0.5Mn1.5O2 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 carb...

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Bibliographic Details
Published in:Electrochimica acta 2017-01, Vol.224, p.429
Main Authors: Tanabe, Toyokazu, Gunji, Takao, Honma, Youhei, Miyamoto, Koki, Tsuda, Takashi, Mochizuki, Yasumasa, Kaneko, Shingo, Ugawa, Shinsaku, Lee, Hojin, Ohsaka, Takeo, Matsumoto, Futoshi
Format: Article
Language:English
Subjects:
Aluminum oxide
Batteries
Carcinogens
Coated particles
Coating
Coatings
Diffraction
Discharge
Emission spectroscopy
Lithium
Lithium-ion batteries
Particle physics
Polymers
Rechargeable batteries
Scanning electron microscopy
Slurries
Spinel
Studies
Transmission electron microscopy
Water resistance
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:Water-resistant LiNi0.5Mn1.5O2 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 LiNi0.5Mn1.5O2 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 LiNi0.5Mn1.5O2 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 LiNi0.5Mn1.5O4 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.
ISSN:0013-4686
1873-3859