蒽醌基共轭微孔聚合物用于锂离子电池正极材料性能研究-中国材料进展

文章信息/Info

Title:: Anthraquinone-Based Conjugated Microporous Polymer as a Cathode Material for Lithium-Ion Battery

作者:: 罗连伟1; 马雯燕1; 刘宇2; 黄秀华1; 张崇1; 蒋加兴1; （1．陕西师范大学材料科学与工程学院,陕西西安 710062）（2．北京新能源技术研究所,北京 102300）

Author(s):: LUO Lianwei1; MA Wenyan1; LIU Yu2; HUANG Xiuhua1; ZHANG Chong1; JIANG JiaXing1; (1.School of Materials Science and Engineering, Shaanxi Normal University, Xi‘an 710062, China) (2.Beijing Institute of New Energy Technology, Beijing 102300, China)

Keywords:: conjugated microporous polymer; biphenyl; anthraquinone; organic cathode material; lithium-ion battery

摘要:: 含有氧化还原活性基团的有机材料因其氧化还原活性高、成本低、构建单元多样等特点，成为一类极具发展潜力的可充电电池电极材料。然而，有机小分子和线性聚合物在有机电解质中高的溶解性通常导致其存在电极材料容量随循环快速衰减等问题。共轭微孔聚合物由于其交联多孔的骨架结构及高度共轭的大分子链，使其在二次电池电极材料方面具有巨大的应用前景。以具有共轭结构的联苯及含有活性基元（羰基）的蒽醌为构建单元，通过经典的Suzuki偶联反应合成了具有高比表面积（257 m2·g-1）及丰富活性位点的蒽醌基共轭微孔聚合物（PLPhAq）锂离子电池正极材料。在50 mA·g-1的电流密度下,PLPhAq正极具有164 mAh·g-1的比容量，循环800圈后仍能保持126 mAh·g-1的比容量，并在1000 mA·g-1的电流密度下循环5000次后比容量仅从97衰减至74 mAh·g-1，该研究工作表明共轭微孔聚合物是一类极具发展潜力的锂离子电池正极材料。

Abstract:: Due to the high redox activity, low cost and diversity of the building blocks, organic redox active materials could be a class of promising electrode materials for rechargeable batteries. However, the high solubility of organic small molecules and linear polymers in organic electrolytes usually results in a rapid loss of capacity with cycling. Benefiting from the porous structure and highly conjugated polymer chains, conjugated microporous polymers have attracted great attention as electrode materials for rechargeable batteries. In this work, we employed biphenyl and anthraquinone as the building blocks to synthesize an anthraquinone-based conjugated polymer (PLPhAq) by palladium-catalyzed Suzuki coupling reaction. Owing to the high specific surface area of 257 m2·g-1 and plentiful active sites (—CO), the PLPhAq cathode for lithium-ion batteries shows a high specific capacity of 164 mAh·g-1 at the current density of 50 mA·g-1. After 800 cycles, PLPhAq still could maintain a reversible specific capacity of 126 mAh·g-1 at 50 mA·g-1. The PLPhAq cathode also exhibits a long and stable cycling stability with a slight capacity fading from 97 to 74 mAh·g-1 after 5000 cycles at a high current density of 1000 mA·g-1, demonstrating that conjugated microporous polymers could be a class of promising organic cathode materials for high performance lithiumion batteries.