摘要
以FeSO4·7H2O,H3PO4,H2O2和NH3·H2O为原料合成纳米化的FePO4·1.5H2O,并将Li2CO3、FePO4·1.5H2O和葡萄糖混合球磨,在不同的温度下通过碳热还原合成LiFePO4/C。采用X射线衍射(XRD)、扫描电镜(SEM)、循环伏安(CV)和恒电流充放电测试研究了不同温度下合成的LiFePO4/C样品的结构、形貌及电化学性能。结果表明,在800℃下合成的样品具有最佳的电化学性能,在0.2C(1C=150mAh/g)倍率下放电,首次放电比容量为142.7mAh/g,经过20次充放电循环后容量基本保持不变。
Nano-FePO4·1.5 H2O was synthesized from FeSO4·7H2O, Ha PO4, HeO2 and NH3·H2O. LiFePO4/C cathode material was then prepared at different temperatures by carbothermal reduction method using homogeneous mixture of Li2CO3,glucose and FePO4·1.5H2O. The structure,morphology and electrochemical properties of the samples were tested by X-ray diffraction（XRD）, scanning electronmicroscopy（gEM）, cyclic voltammetry（CV） and galvanostatic charge discharge test. The results showed that the LiFePO4/C composites synthesized at 800℃ for 12h had optimal electrochemical properties and exhibited a initial discharge capacity of 142.7 mAh/g at 0.2C（1C= 150mAh/g）rate,there is almost no capacity fading after 20 cycles.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第B02期118-121,共4页
Journal of Functional Materials
基金
青海省重点科技攻关资助项目(2006-G-168)
