Influence of pH value on particle morphology and electrochemical properties of LiFePO4/C by biosynthesis method.

A series of LiFePO₄/C composites are prepared under the conditions of pH = 3, 5, 7, 8, 9 via biosynthesis method. The X-ray diffraction demonstrates that all of well-crystallized LiFePO₄/C composites can be successfully prepared by adjusting the pH value. The images of scanning electron microscopy show that the structure and size of different samples have obvious changes. Besides, the LiFePO₄/C composite prepared at the value of 8 delivers a best discharge capacity of 158.7 mAh/g at 0.1 C. The results show that the electrochemical performance of LiFePO₄/C composites is governed by pH value. [ABSTRACT FROM AUTHOR]