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摻雜元素La、F對(duì)尖晶石LiMn2O4材料結(jié)構(gòu)及性能的影響
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廣西省自然科學(xué)基金資助項(xiàng)目(0542012)


Effects of Doping Elements Lanthanum and Fluorine on Structure and Electrochemical Performance of Spinel LiMn2O4 Cathode Material
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    摘要:

    采用X-射線衍射儀(XRD)、掃描電子顯微鏡(SEM)、電池測試系統(tǒng)等研究了摻雜元素La、F對(duì)高溫固相合成尖晶石型LiMn2O4材料的相結(jié)構(gòu)、形貌、活化性能、循環(huán)穩(wěn)定性能的影響。結(jié)果表明：摻雜元素La、F可有效地提高LiMn2O4樣品的充放電效率、循環(huán)穩(wěn)定性能；隨著摻雜元素F含量的增加，LiMn2O4-xFx樣品的初始容量降低、循環(huán)穩(wěn)定性能呈現(xiàn)出先增后減的變化規(guī)律；當(dāng)摻雜元素La、F的含量較少時(shí)，LiLayMn2-yO4-xFx樣品具有純的尖晶石LiMn2O4結(jié)構(gòu)，樣品呈球形或近球形，粒徑范圍為0.5~2

    Abstract:

    The effects of the doping elements such as La and F on the phase structure, the morphology, the activate and electrochemical properties of the spinel LiMn2O4 cathode material prepared by high temperature solid state reaction were investigated by means of the X-ray diffraction (XRD), scanning electron microscope (SEM) and battery testing system this paper. The results showed that the initial discharge capacity of the LiMn2O4-xFx sample decreased, and the cyclic stability of the specimen increased and then decreased with increasing of the content of the replacement elements Fluorine. The capacity ratio of discharge to charge and the cyclic stability of the LiMn2O4 sample were improved with the manganese and Oxygen partial replaced by La and F, respectively. The LiLayMn2-yO4-xFx sample was composed of single-phase spinel LiMn2O4 when the content of the doping elements La and F was minor, the particles of the specimen were spheroid or sphere, and the sizes of the particles were 0.5~2.5 μm. The discharge-capacity of the LiLa0.02Mn1.98O3.95F0.05 sample was 123.6 mAh/g and 114.6 mAh/g after the first and the 30th charge/discharge cycles, respectively.

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蒙冕武,廖欽洪,江恩源,劉心宇,呂 罡,黃 煌.摻雜元素La、F對(duì)尖晶石LiMn2O4材料結(jié)構(gòu)及性能的影響[J].稀有金屬材料與工程,2009,38(6):995~998.[Meng Mianwu, Liao Qinhong, Jiang Enyuan, Liu Xinyu, Lü Gang, Huang Huang. Effects of Doping Elements Lanthanum and Fluorine on Structure and Electrochemical Performance of Spinel LiMn2O4 Cathode Material[J]. Rare Metal Materials and Engineering,2009,38(6):995~998.]
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  • 收稿日期:2008-06-11
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