Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (4): 969-974.doi: 10.3866/PKU.WHXB201601061

• ARTICLE • Previous Articles     Next Articles

Synthesis and Electrochemical Performance of a Benzoquinone-Based Polymer Anode for Aqueous Lithium-Ion Batteries

Li-Li CAI1,Yue-Hua WEN2,*(),Jie CHENG2,Gao-Ping CAO2,Yu-Sheng YANG1,2   

  1. 1 Faculty of Science, Beijing University of Chemical Technology, Beijing 110159, P. R. China
    2 Research Institute of Chemical Defence, Beijing 100191, P. R. China
  • Received:2015-09-25 Published:2016-04-07
  • Contact: Yue-Hua WEN E-mail:wen_yuehua@126.com
  • Supported by:
    the Beijing Key Laboratory of Advanced Chemical Energy Storage Technology and Material

Abstract:

Using the tetrachloro-p-benzoquinone (TCQ) monomer, poly(benzoquinonyl sulfide) (PBQS) was synthesized by a simple polycondensation reaction. The influence of the molar ratio of S to Na2S on the electrochemical performance of a PBQS anode was assessed by changing the amount of S added. The results showed that the electrochemical performance of PBQS strongly depended on the molar ratio of S to Na2S. When the molar ratio of S to Na2S was 0.4, two Cl were replaced by S, and PBQS with a stable structure was obtained. The discharge capacity of PBQS exceeded 140 mAh·g-1. At the same time, PBQS displayed satisfactory rate capability and excellent cyclability. Conversely, when the molar ratio of S to Na2S was decreased to 0.25, Cl was not substituted completely and the polymerization degree was low. Upon increasing the molar ratio of S to Na2S to 0.7, an unstable S-S bond may form in the polymer. The above two factors degraded the electrode performance of these materials.

Key words: Aqueous lithium-ion battery, Polycondensation, Poly(benzoquinonyl sulfide), Mole ratio of S to Na2S, Electrochemical performance

MSC2000: 

  • O646