The surface of Li₂FeP₂O₇/C modified by AlF₃ was prepared by solid-state synthesis and a sol-gel coating process. The monoclinic crystal structure with a P 2₁/c space group was characterized by XRD for as-prepared and different ratios of AlF₃-coated Li₂FeP₂O₇/C. The chemical bonds for Al and F were examined by XPS spectra. The morphologies were observed by FE-SEM and HR-TEM. The electrochemical measurements, such as EIS, CV, and galvanostatic charge-discharge, were conducted, and 1.0 wt% AlF₃-coated Li₂F₃P₂O₇/C revealed the lowest charge-transfer resistance and IR drop of all compared groups. The rate capability of the 1.0 wt% AlF₃-coated Li₂FeP₂O₇/C was improved over that of the uncoated Li₂FeP₂O₇/C and of different coating-ratio samples. Finally, the surface modification of Li₂FeP₂O₇/C coated with 1.0 wt% of AlF₃ is an effective way to improve the electrochemical performance in the Li₂FeP₂O₇/C cathode.

通过固相合成和溶胶-凝胶涂布法制备经AlF ₃改性的Li ₂ FeP ₂ O ₇ / C的表面。通过XRD表征制备的P 2 ₁ / c空间基团的单斜晶体结构以及不同比例的AlF ₃涂覆的Li ₂ FeP ₂ O ₇ / C。通过XPS光谱检查了Al和F的化学键。通过FE-SEM和HR-TEM观察形态。进行了电化学测量，例如EIS，CV和恒电流充放电，并进行了1.0 wt％AlF ₃涂覆的Li ₂ F ₃ P _{2的测量。}O ₇ / C揭示了所有比较组中最低的电荷转移电阻和IR下降。率能力1.0重量％的AlF ₃涂覆的李₂ FEP ₂ ö ₇ / C进行了改进在未涂覆的Li ₂ FEP ₂ ö ₇ / C和不同的涂层比样品。最后，用1.0wt％的AlF ₃涂覆的Li ₂ FeP ₂ O ₇ / C的表面改性是提高Li ₂ FeP ₂ O ₇ / C阴极的电化学性能的有效方法。