Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (1): 111-120.doi: 10.3866/PKU.WHXB201411173

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Effects of Cathode Current Collectors on the Electrochemical Performance of Rechargeable Magnesium Batteries

SU Shuo-Jian, NULI Yan-Na, FEILURE Tuerxun, YANG Jun, WANG Jiu-Lin   

  1. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
  • Received:2014-09-24 Revised:2014-11-15 Published:2014-12-25
  • Contact: NULI Yan-Na E-mail:nlyn@sjtu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21273147).

Abstract:

The effects of different cathode current collectors (stainless steel, nickel, copper, and titanium) on the electrochemical performance of rechargeable magnesiumbatteries were investigated. Chevrel phase Mo6S8 acted as the cathode, (PhMgCl)2- AlCl3/tetrahydrofuran (THF) (the second generation electrolyte) as the electrolyte, and magnesium as the anode. Constant current discharge-charge results indicated that the electrochemical polarization of the electrode on stainless steel was the smallest and its cycling stability was the best, followed by nickel, copper, and titanium. Microstructure analyses for the electrodes and current collectors before and after discharge-charge were analyzed to investigate the differing electrochemical performance. The electrolyte corroded the current collectors to differing degrees. The surfaces of the electrodes differed after coating the active material on different current collectors. The corrosion potentials of the current collectors decreased after loading the active material. This resulted in the current collectors being more susceptible to corrosion by the electrolyte.

Key words: Rechargeable magnesiumbattery, Cathode, Current collector, Electrochemical performance, Corrosion

MSC2000: 

  • O646