物理化学学报 >> 2016, Vol. 32 >> Issue (4): 969-974.doi: 10.3866/PKU.WHXB201601061

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水系锂离子电池负极聚硫代苯醌的合成与电化学性能

蔡莉丽1,文越华2,*(),程杰2,曹高萍2,杨裕生1,2   

  1. 1 北京化工大学理学院, 北京 110159
    2 北京防化研究院, 北京 100191
  • 收稿日期:2015-09-25 发布日期:2016-04-07
  • 通讯作者: 文越华 E-mail:wen_yuehua@126.com
  • 基金资助:
    北京市先进化学储能技术与材料重点实验室资助项目

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

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摘要：

通过硫化聚合的方法,以四氯苯醌(TCQ)为单体合成了聚硫代苯醌(PBQS)材料。本文改变S的加入量,探讨了不同摩尔比的S和Na2S对PBQS电极电化学性能的影响。当S和Na2S摩尔比为0.4时,形成两个氯原子被硫取代的PBQS-0.4稳定结构。PBQS-0.4电极放电比容量达到140 mAh·g-1以上,显现出良好的循环稳定性和优异的倍率性能。而当S和Na2S摩尔比降至0.25时,氯取代不完全、聚合程度不高; S和Na2S摩尔比增至0.7 : 1时,聚合物中可能形成了不稳定的累积S-S键;上述两方面都导致电极性能明显下降。

关键词: 水系锂离子电池, 缩聚法, 聚硫代苯醌, S和Na2S摩尔比, 电化学性能

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