Preparation and Electrochemical Characterization of Multicomponent Layered Cathode Materials for Lithium Ion Secondary Batteries
Date Issued
2007
Date
2007
Author(s)
Shen, Bo-Jun
DOI
en-US
Abstract
LiNi1/3Co1/3Mn1/3O2 powders have been successfully synthesized through a developed microwave-hydrothermal (M-H) process. In comparison with the co-precipitation process having complicated steps, the microwave-hydrothermal process not only reduced the reaction time for preparing LiNi1/3Co1/3Mn1/3O2, but also effectively decreased the average particle size of powders. The results of electrochemical performance show that the sample prepared by the microwave hydrothermal process is superior to that by the co-precipitation method.
In order to study the influences of microwave-radiated temperatures on the morphology of particles, the temperature during the reaction was changed. When the microwave-radiated temperature increased from 100oC to 180oC, the particles exhibited a less agglomerated morphology and reduced particle size. Increasing the microwave-radiated temperatures of preparation for precursors not only increased the surface area of LiNi1/3Co1/3Mn1/3O2 powders but also enhanced the electrochemical performances. When the temperature of microwave-hydrothermal treatment was raised to 180oC, the final products of LiNi1/3Co1/3Mn1/3O2 exhibited significantly improved characteristics. It showed that the discharge capacity was approximately 170 mAh/g and the retention was 98.5% after 10 cycles. The prepared materials also exhibited high lithium ion diffusion coefficient and good rate capability in EIS tests.
Subjects
鋰離子二次電池
陰極材料
微波水熱
LiNi1/3Co1/3Mn1/3O2氧化物
微波輻射溫度
Lithium ion battery
cathode materials
microwave hydrothermal
LiNi1/3Co1/3Mn1/3O2 oxide
microwave radiation temperature
Type
thesis