Chen S.-B.,JiShou University |
Wu X.-M.,JiShou University |
Wu X.-M.,Xiangxi Ores Minerals and New Materials Development and Service Center |
Chen S.,JiShou University |
And 3 more authors.
Xiandai Huagong/Modern Chemical Industry
LiAlO2 coated spinel LiMn2O4 is prepared by ultrasonic assisted solution method. The structure, surface morphology and electro-chemical performance of the resultant materials are characterized by X-ray diffraction, scanning electron microscope (SEM), galvanostatic charge-discharge technique and AC impedance spectroscope. The XRD results show that LiMn2O4 and LiAlO2-coated LiMn2O4 have the similar X-ray diffraction patterns. They are spinel structure without impurity phase. When charge-discharge of 0.2 C is cycled at room temperature, the initial discharge specific capacity of LiMn2O4 coated with 0.5%, 1% and 3% of LiAlO2 are 123.3, 120.2 and 118.7 mA·h/g, respectively, which are a bit smaller than that of the uncoated LiMn2O4 (125.4 mA·h/g). But when charge-discharges of 1C and 5C are performed, the discharge specific capacities of LiMn2O4 coated with 3% LiAlO2 are 107.8 mA·h/g and 104.2 mA·h/g, respectively, which are much higher than that of origin LiMn2O4 (102.8 mA·h/g and 64.1 mA·h/g, respectivley). When the charge-discharge of 1C is cycled for 50 times at room temperature, the capacity retention of 3% LiAlO2 coated LiMn2O4 is higher than that of the uncoated one by 2.9%. © 2016, China National Chemical Information Center. All right reserved. Source