Preparation and Analysis of ZrO2-coated LiMn2O4 as Cathode for Li-ion Secondary Batteries
Date Issued
2004
Date
2004
Author(s)
Lin, Yong-Mao
DOI
en-US
Abstract
Two synthetic routes including sol-gel process and fluidized-bed chemical vapor deposition (FBCVD) process were introduced to the preparation of ZrO2-coated LiMn2O4 as cathode materials for lithium ion secondary batteries. X-ray diffraction (XRD) spectra from the ZrO2-coated LiMn2O4 indicated that ZrO2 exist as amorphous phase. The morphology of ZrO2-coated samples were observed by scanning electron microscope (SEM) and transmission electron microscope (TEM), which revealed that the zirconium oxide attached smoothly onto the surface of LiMn2O4. The surface-modified LiMn2O4 samples showed much better capacity retention than the unmodified LiMn2O4 cathode at both room temperature and 55℃. The improved cycle life performance could be due to a suppression of the Jahn-Teller distortion which took place at low voltage during cycling.
Subjects
鋰離子二次電池
表面改質
氧化鋯
zirconia
Li-ion battery
surface modification
Type
thesis
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