Effect of corrosion for Al foils on electrical performance of sphere LiFePO4/C composite
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摘要: 以Fe （NO3）39H2O、H3PO4、HNO3为原料，采用液相结晶法制备类球状FePO4前驱体，后续运用高温固相还原法制备球状LiFePO4/C复合材料。对腐蚀后的Al箔进行SEM、金相显微镜和测厚规表征分析。以腐蚀后的Al箔作为Li离子电池正极材料LiFePO4/C复合材料的集流体时进行电性能测试，结果表明：腐蚀Al箔表面形成密集有序的三维微方孔，内部也形成了密集的隧道孔且Al箔厚度减少了14.29%。以腐蚀后Al箔作为集流体时，LiFePO4/C复合材料的电性能得到改善，在0.1 C下首次放电容量为153 mAh·g-1，电极反应电阻为51.12 Ω，且具有良好的倍率性能和循环稳定性能。Abstract: Using Fe(NO3)39H2O, H3PO4, HNO3 as the raw materials, the semi-sphere FePO4 precursors were prepared by liquid phase crystallization method, and then the sphere LiFePO4/C composite was synthesized by high temperature solid phase method. The corrosive Al foils were characterized by SEM, metalloscope and feeler gauge. The corrosive Al foils were used as the current collector of cathode LiFePO4/C composite of Li ion battery. The result shows that the surface of corrosive Al foil have 3D dense ordered micro square porous and possessing dense tunnels in the inner and the thickness of Al foil is decreased by 14.29%.The initial discharge capacity at 0.1 C is 153 mAh·g-1 and the electrode react resistance is 51.12 Ω. LiFePO4/C composite has good rate property and cycle stability.
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Keywords:
- LiFePO4/C /
- composite /
- corrosive Al foils /
- current collector /
- electrical performance
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