Open AccessErosion Mechanism of Li-Ion Batteries Cathode Materials on Si3N4-SiC and SiO2-SiC Refractories
Author(s) -
Xueke Duan,
Fan Qian,
Y. Q. Chen,
H. X. Li,
Alan Guo,
Y. C.,
X. F. Wang,
G. Q. Liu
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/678/1/012101
Subject(s) - materials science , cathode , layer (electronics) , erosion , refractory (planetary science) , ion , slab , ternary operation , composite material , chemical engineering , chemistry , paleontology , organic chemistry , geophysics , computer science , engineering , biology , programming language , geology
The erosion mechanism of Li-ion ternary cathode material on Si 3 N 4 -SiC and SiO 2- SiC refractory slabs was studied at 780 °C for 20h. The results show that the erosion resistance of Si 3 N 4 -SiC is much better than that of SiO 2 -SiC refractory slab after heat treatment for 20h. Erosion mechanism of the two kinds of refractory slabs are different. Inward diffusion of Li 2 O reacts with a large amount of SiO 2 in the SiO 2 -SiC system. This leads to a large number of reaction products, so that the incompletely reacted SiC particles fall off along with the reaction product, causing the erosion of SiO 2 -SiC. For Si 3 N 4 -SiC, it is mainly because the dense SiO 2 protective layer produced by oxidation of Si 3 N 4 prevents further oxidation of Si 3 N 4 and SiC in the system, giving the material excellent erosion resistance.