球形LiMnPO4/C正极材料的喷雾干燥法制备及性能研究
收稿日期: 2020-08-06
网络出版日期: 2021-01-08
Preparation and properties of spherical LiMnPO4/C cathode materials by spray drying method
Received date: 2020-08-06
Online published: 2021-01-08
张凯 , 江奥 . 球形LiMnPO4/C正极材料的喷雾干燥法制备及性能研究[J]. 无机盐工业, 2021 , 53(1) : 54 -58 . DOI: 10.11962/1006-4990.2020-0101
One-time spray-drying method was used to prepare spherical LiMnPO4/C cathode materials with lithium hydroxide,manganese acetate,NH4H2PO4 and polyethylene glycol as raw materials.The effect of calcination temperature on the morpho-logy,structure and electrochemical performance of spherical LiMnPO4/C samples was studied.Its structure and morphology were characterized by X-ray diffraction（XRD）and field emission scanning electron microscopy（SEM）.The morphology and prechemical properties of LiMnPO4/C obtained after calcination at different temperatures are quite different.The results showed that the spherical LiMnPO4/C calcined at 700 ℃ had olivine-type crystal structure,and it showed a spherical shape composed of one-dimensional nano particles with a diameter of about 50 nm under SEM.The specific discharge capacity of this sample reached 148 mA·h/g for the first time at a rate of 0.1C at room temperature.After 80 cycles,the specific discharge capacity was still around 140 mA·h/g,and the capacity retention rate was 94.6%.
Key words： lithium-ion batteries; cathode material; LiMnPO4; spray drying method
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