• DANPING JIANG

      Articles written in Bulletin of Materials Science

    • An improved synthesis of iron phosphate as a precursor to synthesize lithium iron phosphate

      DANPING JIANG XIANGJUN ZHANG TING ZHAO BINGXUE LIU RONG YANG HONGKUN ZHANG TENGFEI FAN FAN WANG

      More Details Abstract Fulltext PDF

      Two different kinds of FePO$_4$: amorphous FePO$_4$ and crystalline FePO$_4$, were synthesized as a precursor to synthesize LiFePO$_4$/C. The crystalline FePO$_4$ was obtained by treating amorphous FePO$_4$ with phosphoric acid refluxing. Inductively coupled plasma-atomic emission spectrometry was used to evaluate the impurity content. The obtained materialswere characterized by chemical analysis, scanning electron microscopy and X-ray diffraction. The results showed that the performance of LiFePO$_4$/C synthesized by crystalline FePO$_4$ is significantly better than when LiFePO$_4$/C is synthesized from amorphous FePO$_4$. The capacity retention and capacity fade of LiFePO4/C synthesized from crystalline FePO$_4$ was 70.9% at $−$20$^{\circ}$C and 0.012% per cycle after 150 cycles at 1$C$, respectively. The better performance from using crystalline precursor resulted from a more uniform powder with fewer crystalline defects and impurities.

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