A Copper-Based Polycarbonyl Coordination Polymer as a Cathode for Li Ion Batteries
Haoqi Su, Yidan Song, Yao Hu, Yanwei Ma, Wenlong Liu, Hongjiang Liu, Qi Liu
Abstract
It is of great significance for the sustainable development of society to search for novel coordination polymer-based electrode materials of lithium ion batteries. Herein, a two-dimensional coordination polymer, ([Cu(4-DTBPT)2(DMF)2](C10H4O8) (Cu-CP) (DTBPT = 2,7-di(4H-1,2,4-triazol-4-yl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetraone; DMF = dimethylformamide), was synthesized and first used as a cathode material of lithium ion batteries. The Cu-CP electrode displayed a better cycling stability and the specific capacity of 40.3 mA h g–1 at 50 mA g–1 after 50 cycles along with a Coulombic efficiency of 96.7%. The electrochemical study for the Cu-CP electrode reveals that both Cu(II) ions and 4-DTBPT ligands may be involved in the electrochemical reaction during charge and discharge. Our work demonstrates again that it is a feasible way to utilize the interaction of metal ions and organic ligands with redox activity for constructing coordination polymers acting as the cathode materials for lithium ion batteries.