以抗坏血酸为碳源微波合成LiFePO4 /C及电化学性能
Synthesis and Electrochemical Performance of LiFePO4 / C Composite Prepared by Microwave Method Using Ascorbic Acid as Carbon Source
傅鹏立1, 谷书华1, 王力臻1, 2, 张 勇1
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作者单位：(1. 郑州轻工业学院, 河南 郑州 450002; 2. 河南省表界面科学重点实验室, 河南 郑州 450002)
中文关键字：LiFePO4 /C复合材料； 抗坏血酸； 微波法； 电导率
英文关键字：LiFePO4 /C composite; ascorbic acid; microwave method; conductivity
中文摘要：以抗坏血酸(VC)为碳源微波加热合成了LiFePO4 /C复合材料。采用X射线衍射、扫描电镜、电导率测试和恒流充放电等方法对材料的结构、形貌、电导率及电化学性能进行表征，考察了VC加入量对所合成材料电化学性能的影响。结果表明：VC能有效抑制Fe2+的氧化；当添加VC为10 wt%，微波功率为640 W，加热8 min时，得到的LiFePO4 /C材料电化学性能最优；放电倍率为0.2 C和2 C时首次放电比容量分别为137、97 mAh /g，10次循环后容量保持率分别达95%和81%。
英文摘要：LiFePO4 /C composite was prepared by microwave method using ascorbic acid (VC) as carbon source. The phase structure, surface morphology, conductivity and electrochemical performance of LiFePO4/C composite were characterized by XRD, SEM, conductivity test and galvanostatic charge-discharge, respectively, and the effects of VC doping content on the properties of LiFePO4 /C composite were studied. The results show that the oxidation of Fe2+ is efficiently prevented by VC. The optimal technological condition is : VC adding amount 10wt%, microwave power 640 W, and heating time 8 min. Under the condition, the sample has excellent electro-chemical performance. The discharge capacity under the discharge rate of 0.2C and 2C is 137 and 97 mAh/g, and the capacity retention rate after 10th cycle is 95% and 81%, respectively.