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PVA析出法包覆LiFePO_4正极材料的研究

The Research on Carbon-coating of LiFePO_4 via PVA Precipitation
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摘要 利用聚乙烯醇(PVA)在水和乙醇中溶解度的不同使PVA均匀析出,可同时使PVA和超细导电碳(SP)均匀包覆在水热合成的LiFePO4表面。该方法不仅在LiFePO4颗粒之间形成三维网状碳结构,而且在LiFePO4颗粒表面形成均匀的无定形碳包覆层。碳包覆后的磷酸铁锂0.2 C首次放电容量由120 mAh/g提高到140 mAh/g,5 C放电容量由10 mAh/g提高到100 mAh/g。 PVA and SP are homogeneously coated on the surface of the hydrothermally synthesized LiFePO4 due to the different solubility of PVA in water and alcohol. After calcination at 600 ~C for 5 h in N2, LiFePOJC anode material was obtained. SEM and TEM photos showed that the PVA formed a three - dimensional network structure among the LiFe- PO4 particles and the LiFePO4 particles were homogeneously coated by a layer of amorphous carbon. After carbon coating, the first discharge specific capacity of LiFePO4 at 0.2 C increased from 120 mAh/g to 140 mAh/g, and the specific ca- pacity at 5 C rate increased from 10 mAh/g to 100 mAh/g.
作者 彭蕴龙 张五星 陈元峻 徐辉宇 冯炜
机构地区 华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室 上海宝钢磁业有限公司
出处 《广州化工》 CAS 2012年第13期61-63,共3页 GuangZhou Chemical Industry
基金 国家高技术研究发展计划863项目(No:2009AA03Z225)
关键词 LIFEPO4 碳包覆 PVA SP 析出法 LiFePO4 carbon coating PVA SP precipitation
分类号 TQ152 [化学工程—电化学工业]
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参考文献11

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二级参考文献16

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广州化工
2012年 第13期

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