Acta Chim. Sinica ›› 2018, Vol. 76 ›› Issue (3): 202-208.DOI: 10.6023/A17110477 Previous Articles     Next Articles

Article

芘基共轭微孔聚合物用于锂离子电池电极材料性能研究

贺倩, 张崇, 李晓, 王雪, 牟攀, 蒋加兴   

  1. 陕西师范大学 材料科学与工程学院 西安 710062
  • 收稿日期:2017-11-02 出版日期:2018-03-15 发布日期:2017-12-04
  • 通讯作者: 蒋加兴 E-mail:jiaxing@snnu.edu.cn
  • 基金资助:

    项目受国家自然科学基金(Nos.21574077,21304055)资助.

Pyrene-Based Conjugated Microporous Polymer as High Performance Electrode for Lithium-Ion Batteries

He Qian, Zhang Chong, Li Xiao, Wang Xue, Mu Pan, Jiang Jiaxing   

  1. School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, China
  • Received:2017-11-02 Online:2018-03-15 Published:2017-12-04
  • Contact: 10.6023/A17110477 E-mail:jiaxing@snnu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 21574077, 21304055).

Lithium ion batteries (LIBs) have been recognized as one of the most popular and promising energy storage devices because of their high energy density and cyclability. The leading electrode materials for LIBs are mainly based on inorganic compounds materials because of their excellent electrochemical performances. Compared with inorganic compounds or metal-based electrode materials, organic electrode materials have been less explored for LIBs, but they are promising because of their synthetic diversity, flexible framework, low cost and environmental benignity. Unlike organic small molecules and linear polymers electrodes, which show low surface area and are soluble in electrolyte leading to the low electrochemical performance, conjugated microporous polymers (CMPs) feature with large specific surface area, good physicochemical stability, unique extended π-conjugation along the polymer skeleton and high crosslinked degree, which make CMPs great potential as electrodes for LIBs. In this work, a pyrene-based conjugated microporous polymer (PyDB) has been synthesized via palladium-catalyzed Suzuki cross-coupling reaction from tetrabromopyrene and 1,4-benzenediboronic acid. PyDB is insoluble in common organic solvents tested because of its highly crosslinked polymer structure. Thermogravimetric analysis indicated that the polymer is thermally stable up to 430℃ in nitrogen atmosphere. Nitrogen adsorption-desorption measurement revealed that PyDB has a high Brunauer-Emmet-Teller specific surface area of up to 1283 m2·g-1. PyDB based electrode for LIBs exhibited excellent electrochemical performance. The assembled LIB from PyDB as cathode material shows a discharge capacity of 163 mAh·g-1 at a current density of 50 mA·g-1 with a high capacitance retention of 167 mAh·g-1 after 300 cycles at a current density of 100 mA·g-1. When PyDB was used as anode material, the assembled LIB also exhibits a high capacity of 495 mAh·g-1 at 50 mA·g-1 with a high capacitance retention of 245 mAh·g-1 after 300 cycles at 200 mA·g-1. The excellent electrochemical performance of PyDB could be attributed to its extended π-conjugation structure and porous structure with high surface area, the extended π-conjugation is beneficial to the doping reaction and electronic conduction, while porous structure with high surface area can provide plentiful active sites and promote the transmission of ions.

Key words: conjugated microporous polymer, tetrabromopyrene, lithium-ion battery, electrode material