标题:
乙二醇辅助固相法合成LiFePO4Ethylene Glycol-Assisted Synthesis of LiFePO4 by Traditional Solid-State Method
作者:
李艳, 刘英才, 王洁
关键字:
锂离子电池, LiFePO4, 正极材料, 固相合成法, 乙二醇Lithium-Ion Battery; Lithium Iron Phosphate; Cathode Material; Solid-State Method; Ethylene Glycol
期刊名称:
《Material Sciences》, Vol.3 No.5, 2013-09-18
摘要:
本文以Li2CO3，FeC2O4·2H2O和NH4H2PO4为原料，采用传统的固相法合成锂离子电池正极材料LiFePO4/C，为了提高电化学性能，加入乙二醇进行表面改性。利用X射线衍射仪(XRD)，扫描电子显微镜(SEM)对材料晶体结构、表观形貌和化学成分进行表征，采用恒电流充放电测试技术对其电化学性能进行测定，并且研究了乙二醇对LiFePO4/C晶体生长方向的影响。结果表明经乙二醇改性的LiFePO4/C颗粒呈板状堆积，在0.1 C、0.5 C、1.0 C的电流密度下充放电平台稳定，并且具有较好的循环效率。Lithium-ion battery cathode material LiFePO4/C was synthesized by Li2CO3, FeC2O4·2H2O, NH4H2PO4 ina traditional way, and ethylene glycol was used as surfactant for advancing electrochemical performance. The crystalline structure, morphology and chemical composition of LiFePO4/C particles were characterized by X-ray diffraction, scan- ning electron microscopy and electrochemical performancewas characterized byconstant-current charge-discharge test technique, respectively. In addition, the effects of ethylene glycol on the crystal growth direction were discussed inthis paper. The results show that the grains of LiFePO4/C whichare synthesized with ethylene glycol-assisted present plate- type accumulation. The charge-discharge potential flats present smooth in different current density (0.1C,0.5Cand1.0C) and the cycle abilityis stable.