一种作为锂离子电池负极材料的不含溶剂分子的镉配位聚合物  

A Cadmium-Based Coordination Polymer Including No Solvent as an Anode Material for Li-Ion Batteries

作　　者：陈晓娟 戎红仁[1] 于丽丽[1] 程美令[1] 孙光池 刘琦[1] CHEN Xiao-Juan;RONG Hong-Ren;YU Li-Li;CHENG Mei-Ling;SUN Guang-Chi;LIU Qi(School of Petrochemical Engineering,Jiangsu Provincial Key Laboratory of Fine Petrochemicals,Changzhou University,Changzhou,Jiangsu 213164,China)

机构地区：[1]常州大学石油化工学院,江苏省精细石油化工重点实验室,常州213164

出　　处：《无机化学学报》2022年第7期1367-1374,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21975034)资助。

摘　　要：为了开发高能量密度的锂离子电池(LIB),作为LIB电极材料的配位聚合物,已经受到了研究人员的关注。利用CdCl_(2)、咪唑(Im)和四氟对苯二甲酸(H_(2)tfbdc)作用合成了一维配位聚合物[Cd(tfbdc)(Im)_(4)](Cd-TBI),并利用X射线单晶衍射、红外光谱、元素分析和热重实验对Cd-TBI进行了表征。首次考察了它作为LIB负极材料的电化学性能。在电流密度50 mA·g^(-1)下循环50次后,Cd-TBI电极提供了154 mAh·g^(-1)的放电比容量,其容量保持率和库仑效率分别为95.7%和99.2%,展示了优良的循环稳定性。在电流密度1 A·g^(-1)时,Cd-TBI电极仍保持97 mAh·g^(-1)的可逆比容量。For developing lithium-ion batteries(LIBs) with higher energy density, coordination polymers(CPs), as the electrode materials for LIBs, have attracted considerable attention from researchers. Herein, [Cd(tfbdc)(Im)_(4)](Cd-TBI), a one-dimensional(1D) CP, was synthesized by the reaction of CdCl_(2), imidazole(Im), and tetrafluoroterephthalic acid(H_(2)tfbdc), and characterized by single-crystal X-ray diffraction, IR spectrum, and thermogravimetric analysis. In Cd-TBI, tfbdc^(2-) anions bridged Cd(Ⅱ) ions to form a 1D chain structure. These 1D chains are linked to each other by the hydrogen bonds to produce a 3D supramolecular framework. The electrochemical performances of Cd-TBI as an anode material of LIBs were investigated for the first time. Cd-TBI electrode delivered the discharge capacity of 150 mAh·g^(-1)at 50 mA·g^(-1)after 50 cycles, along with the capacity retention of 95.7% and Coulombic efficiency of 99.2%, indicating it has excellent cycling stability. Even at 1 A·g^(-1), the Cd-TBI electrode also kept the discharge capacity of 97 mAh·g^(-1). CCDC: 2152124.

关 键 词：镉 配位聚合物 锂离子电池 负极材料 咪唑 四氟对苯二甲酸 

分 类 号：O614.242[理学—无机化学]