| 两种方法制备的磷酸铁锂/石墨烯复合材料的性能对比 |
| Comparison on Properties of Lithium Iron Phosphate/Graphene Composite Prepared by Two Methods |
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| 摘要: 以FeSO4·7H2O、NH4H2PO4、H2O2、Li2CO3、C6H12O6和自制的氧化石墨烯(GO)为原料,分别采用原位包覆法和非原位包覆法制备了石墨烯磷酸铁锂样品:LiFePO4/C/G-1和LiFePO4/C/G-2。用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、交流阻抗(EIS)和充放电测试研究了两种包覆方法制备的样品的晶体结构、形貌和电化学性能。结果表明原位法包覆所得复合材料LiFePO4/C/G-1具有更优秀的电性能:在2.5~4.1V充放电,0.1C和1C首次放电比容量分别为158.15和150.5mAh·g-1,在1C倍率下循环500次后容量保持率达到98.3%。 |
| 关键词: 复合正极材料 磷酸铁锂 石墨烯 电化学性能 |
| 基金项目: 湖南省自然科学基金(No.2015JJ3152)资助项目。 |
| Abstract: Using FeSO4·7H2O, NH4H2PO4, H2O2, Li2CO3, C6H12O6 and GO as raw materials, LiFePO4/C/G-2 composite cathode material prepared by mixing FePO4·2H2O, Li2CO3 and GO and LiFePO4/C/G-1 by mixing FePO4·2H2O/GO and Li2CO3 were compared. Crystal structure, morphology and electrochemical performance of the two samples were investigated by X-ray diffraction(XRD), scanning electron microscope(SEM), Transmission Electron Microscope (TEM),electrochemical impedance spectroscopy (EIS) test and charge-discharge test. LiFePO4/C/G-1 showed better electrochemical performances compared to LiFePO4/C/G-2. When the chemical synthesis method product (LiFePO4/C/G-1) was charged-discharged in 2.5~4.1 V, the initial discharge capacity was 158.15 and 150.5 mAh·g-1 at 0.1Cand 1Crate, respectively. After cycling for 500 times at 1Crate, the retention of discharge capacity was 98.3%. |
| Keywords: composite cathode material lithium iron phosphate graphene electrochemical performance |
| 投稿时间：2015-01-25 修订日期：2015-04-28 |
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| 全文下载次数: 1959 |
| 胡国荣,彭清远,彭忠东,曹雁冰,杜柯.两种方法制备的磷酸铁锂/石墨烯复合材料的性能对比[J].无机化学学报,2015,31(6):1153-1158. |
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