Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (08): 1863-1867.doi: 10.3866/PKU.WHXB20110807

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis and Properties of LiFePO4/C Cathode Material with a New Carbon Source

CHU Dao-Bao, LI Yan, SONG Qi, ZHOU Ying   

  1. Anhui Key Laboratory of Functional Molecular Solids and Molecular-based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, Anhui Province, P. R. China
  • Received:2011-04-08 Revised:2011-05-31 Published:2011-07-19
  • Contact: CHU Dao-Bao E-mail:dbchu@sina.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20476001) and Natural Science Foundation of Anhui Province, China (070414160).

Abstract:

We synthesized LiFePO4/C composite cathode materials by the rheological phase method with vegetable protein soya bean milk as a carbon source while FePO4·4H2O and LiOH·H2O as raw materials. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that the LiFePO4/C composite materials had good crystallinity, ultrafine sphere-like particles of 200 nm in size and in situ carbon. The electrochemical performance of LiFePO4/C by galvanostatic cycling studies showed excellent cycle stability. The LiFePO4/C cathode material gave a high initial discharge capacity of 156 mAh·g-1 at 0.1C and the first columbic efficiency was 98.7%. This capacity was still 149 mAh·g-1 after 40 cycles at 0.1C and its capacity retention was more than 95% while the discharge capacity reached 134.7 mAh·g-1 at 1C indicating high electrochemical capacity and excellent cycling stability.

Key words: Lithium-ion battery, LiFePO4, Cathode material, Vegetable protein, Carbon coating, Bean milk, Rheological phase method

MSC2000: 

  • O646