Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (02): 283-290.doi: 10.3866/PKU.WHXB20100205

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Composite Cathode Structure and Binder for High Performance Lithium-Sulfur Battery

WU Ying-Lei, YANG Jun, WANG Jiu-Lin, YIN Li-Chao, NULI Yan-Na   

  1. Department of Chemical Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China
  • Received:2009-07-27 Revised:2009-10-12 Published:2010-01-26
  • Contact: YANG Jun E-mail:yangj723@sjtu.edu.cn

Abstract:

Ball milling in combination with heat treatment was used to prepare sulfur-based composite cathode materials incorporating multi-walled carbon nanotubes (MCNTs) for Li-S battery. The structure and morphology of the as-prepared cathode materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of MCNT content and binder type on the capacity, cyclability and self-discharge behavior of a sulfur-based cathode were systematically investigated. Results show that the appropriate amount of MCNTs is 5%-8% (w, mass fraction) and the use of β-cyclodextrin as a water-soluble binder to fabricate the cathode results in the best electrochemical performance. When the Li-S battery was half charged at room temperature, there was almost no self-discharge during storage for 30 d. The charging capacity was 687.7 mAh·g-1 during the 1st cycle and 623.8 mAh·g-1 during the 100th cycle for the cathode at a current rate of 0.1C. Therefore, 90.7%of the capacity was retained.

Key words: Li-S battery, Sulfur-based cathode, MCNTs, Water-soluble binder, Cyclodextrin

MSC2000: 

  • O646.21