| 以Fe2P2O7为前驱体制备LiFePO4及其电化学性能 | |
| Synthesis of LiFePO4/C Composites Using Fe2P2O7 as Precursor by a Two-Setp Solid-State Method | |
| 摘要: 以磷铁废渣（Fe1.5P）和温室效应气体CO2为原料，以磷酸为补充磷源合成磷酸铁锂（LiFePO4）的前驱体Fe2P2O7，并研究了其合成过程对LiFePO4正极材料储能性能的影响。采用SEM观察了LiFePO4的表面形貌，采用XRD分析了LiFePO4和Fe2P2O7的晶体结构。进一步对该方法进行优化，发现Fe1.5P与磷酸混合物（nFe1.5P：nH3PO4=1：1）在800℃热处理6 h合成的Fe2P2O7对应的LiFePO4/C电化学性能最好，在0.1C，0.2C，0.5C和1C倍率下的容量分别可达130，126，117和108 mAh·g-1。 | |
| 关键词: Fe2P2O7 磷铁废渣 CO2 LiFePO4 锂离子电池 | |
| 基金项目: 国家自然科学基金（No.21576170）和材料腐蚀与防护四川省重点实验室开放基金（No.2017CL19）资助项目。 | |
| Abstract: Fe2P2O7 was prepared from Fe-P waste slag and CO2 using a solid-state method, and it was furtherly used as precursor of LiFePO4. The compositions and microstructures of the as-synthesized Fe2P2O7 and LiFePO4 were characterized by TG/DSC, XRD and SEM. It is found that Fe1.5P can be oxidized to Fe2P2O7 over 700℃ in CO2 atmosphere. The optimized synthesis of Fe2P2O7 is described as:mixture of Fe1.5P and H3PO4 (extra P source) is calcined at 800℃ for 6 h, which gives the highest specific capacity of LiFePO4. The discharge capacity of the as-synthesized LiFePO4 can reach as high as 130, 126, 117, and 108 mAh·g-1 with C-rates of 0.1C, 0.2C, 0.5C and 1C, respectively. | |
| Keywords: Fe2P2O7 Fe-P slag CO2 LiFePO4/C Li-ion battery | |
| 投稿时间：2017-08-22 修订日期：2017-11-14 | |
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| 汪瑶,李彦成,冯丽源,赵强,王贵欣,罗春晖,闫康平.以Fe2P2O7为前驱体制备LiFePO4及其电化学性能[J].无机化学学报,2018,34(2):263-269. | |
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