Synthesis of LiMnPO_4/C composite material for lithium ion batteries by sol-gel method  

溶胶-凝胶法合成LiMnPO_4/C锂离子电池复合材料(英文)

作　　者：钟胜奎[1,2,3] 王友[2] 刘洁群[1,2,3] 王健[2] 

机构地区：[1]桂林理工大学广西建筑新能源与节能重点实验室,桂林541004 [2]桂林理工大学化学与生物工程学院,桂林541004 [3]苏州大学沙钢钢铁学院,苏州215021

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第10期2535-2540,共6页中国有色金属学报（英文版）

基　　金：Project (0991025) supported by Natural Science Foundation of Guangxi, China;Project (51164007) supported by the National Natural Science Foundation of China;Project (201101ZD008) supported by Educational Commission of Guangxi, China

摘　　要：The LiMnPO4/C composite material was synthesized via a sol-gel method based on the citric acid. The X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical performance tests were adopted to characterize the properties of LiMnPO4/C. The XRD studies show that the pure olivine phase LiMnPO4 can be obtained at a low temperature of 500 °C. The SEM analyses illustrate that the citric acid used as the chelating reagent and carbon source can restrain the particle size of LiMnPO4/C well. The LiMnPO4/C sample synthesized at 500 °C for 10 h performs the highest initial discharge capacity of 122.6 mA-h/g, retaining 112.4 mA-h/g over 30 cycles at 0.05C rate. The citric acid based sol-gel method is favor to obtain the high electrochemical performance of LiMnPO4/C.通过溶胶-凝胶法合成LiMnPO4/C锂离子电池复合材料,采用XRD、SEM和电化学性能测试对LiMnPO4/C进行性能表征。XRD研究表明,在500°C下能够合成得到纯的LiMnPO4;SEM研究表明,柠檬酸作为螯合剂和碳源能有效地抑制LiMnPO4/C颗粒的长大。在500°C下烧结10h合成的LiMnPO4/C样品的电化学性能最好,首次放电容量为122.6mA·h/g,以0.05C倍率循环30次后其容量为112.4mA·h/g。

关 键 词：lithium-ion battery cathode material sol-gel method LiMnPO4/C electrochemical performance 

分 类 号：TB332[一般工业技术—材料科学与工程]