Al掺杂Li2MnSiO4锂离子电池正极材料的合成和电化学性能
Preparation and Electrochemical Performance of Al-doped Li2MnSiO4 Cathode Material for Lithium Ion Batteries
刘文刚 1, 许云华1, 杨 蓉2, 任 冰1
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作者单位：1. 西安建筑科技大学 材料科学与工程学院, 陕西 西安 710055; 2. 西安理工大学 理学院, 陕西 西安 710048
中文关键字：锂离子电池； 正极材料； Li2MnSiO4； Al掺杂
英文关键字：lithium ion batteries; cathode materials; Li2MnSiO4; doping Al
中文摘要：以Li2SiO3、 Mn(CH3COO)2·4H2O和Al(OH)3为原料， 用传统高温固相合成法成功制备出Li2Al0.1Mn0.9SiO4锂离子电池正极材料。采用XRD、FESEM分析了正极材料的相组成、结构和形貌，利用电池测试仪测试了正极材料的电化学性能。研究结果表明，固相合成的产物主相为Li2Al0.1Mn0.9SiO4，同时存在少量的杂质，产物表面形貌为非球形颗粒，颗粒尺寸为100～500 nm。实验结果表明，Al掺杂后，正极材料的可逆容量和循环寿命都得到提高。正极材料电化学性能提高的机理在于Al掺杂稳定了Li2MnSiO4正极材料的结构。
英文摘要：Li2Al0.1Mn0.9SiO4 cathode material for lithium ion batteries was synthesized by traditional solid-state reaction method taking Li2SiO3, Mn(CH3COO)2·4H2O and Al(OH)3 as raw materials. XRD and FESEM were used to study the phase, structure and morphology of obtained samples. Electrochemical performance of the cathode material was tested. The results show that the main phase of sample prepared via solid-state reaction is Li2Al0.1Mn0.9SiO4, whereas a small amount of impurities exist. The particle size of Li2Al0.1Mn0.9SiO4 sample is 100～500 nm and the morphology of the particle shape is not sphere. The experiment results show that the reversible capacity and cycle life of cathode sample improve through doping Al, and its mechanism is that doping Al can stabilize the microstructure of Li2MnSiO4 cathode material.