Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (09): 1989-1997.doi: 10.3866/PKU.WHXB201306181

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis of Na2MnPO4F/C with Different Carbon Sources and Their Performances as Cathode for Lithium Ion Battery

ZHONG Yan-Jun1,2, LI Jun-Tao2, WU Zhen-Guo1, ZHONG Ben-He1, GUO Xiao-Dong1, HUANG Ling2, SUN Shi-Gang2   

  1. 1 School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
    2 School of Energy Research, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2013-03-19 Revised:2013-06-17 Published:2013-08-28
  • Contact: LI Jun-Tao, GUO Xiao-Dong E-mail:jtli@xmu.edu.cn; xiaodong2009@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50574063, 21021002, 21003102), Sichuan University Funds for Young Scientists, China (2011SCU11081), Research Fund for the Doctoral Program of Higher Education, the Ministry of Education, China (20120181120103).

Abstract:

Na2MnPO4F/C composites were synthesized by wet ball milling and in situ pyrolytic carbon coating. Stearic acid, citric acid, poly(ethylene glycol) 6000, and β-cyclodextrin were used as carbon sources in the synthesis process. The structures, morphologies, and electrochemical performances of the as-synthesized Na2MnPO4F/C composites were further investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller surface area analysis, and galvanostatic chargedischarge tests. Distinct differences were observed in the morphologies and sizes of the Na2MnPO4F/C particles obtained from different carbon sources, and this significantly affected their electrochemical performances. It was found that the primary particle size of the Na2MnPO4F/C material is a key factor in the electrochemical performance. The sample synthesized using citric acid as the carbon source had a micro-nano structure, with the smallest primary particle size of 10-40 nm, and displayed the best electrochemical properties. It delivered an initial discharge capacity of 80 mAh·g-1 under a current density of 5 mA·g-1 in the voltage range of 1.5-4.8 V, and displayed good cycling performance.

Key words: Lithium ion battery, Cathode, Na2MnPO4F/C, Carbon source, Morphology

MSC2000: 

  • O646