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
作者单位E-mail
陈晓娟 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  
戎红仁 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  
于丽丽 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  
程美令 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  
孙光池 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  
刘琦 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 liuqi62@163.com;Tel:0519-86330185 
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CdCl2、咪唑(Im)和四氟对苯二甲酸(H2tfbdc)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。
关键词:   配位聚合物  锂离子电池  负极材料  咪唑  四氟对苯二甲酸
基金项目: 国家自然科学基金(No.21975034)资助。
Abstract: 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 CdCl2, imidazole (Im), and tetrafluoroterephthalic acid (H2tfbdc), and characterized by single-crystal X-ray diffraction, IR spectrum, and thermogravimetric analysis. In Cd-TBI, tfbdc2- 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.
Keywords: cadmium  coordination polymer  lithium-ion battery  anode material  imidazole  tetrafluoroterephthalic acid
投稿时间:2022-02-18 修订日期:2022-04-06
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陈晓娟,戎红仁,于丽丽,程美令,孙光池,刘琦.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[J].无机化学学报,2022,38(7):1367-1374.
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