State Key Laboratory of Elemento-Organic Chemistry and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin, 300071, China.
Angew Chem Int Ed Engl. 2017 Oct 2;56(41):12561-12565. doi: 10.1002/anie.201706604. Epub 2017 Aug 31.
Application of organic electrode materials in rechargeable batteries has attracted great interest because such materials contain abundant carbon, hydrogen, and oxygen elements. However, organic electrodes are highly soluble in organic electrolytes. An organic electrode of 2,3,5,6-tetraphthalimido-1,4-benzoquinone (TPB) is reported in which rigid groups coordinate to a molecular benzoquinone skeleton. The material is insoluble in aprotic electrolyte, and demonstrates a high capacity retention of 91.4 % (204 mA h g ) over 100 cycles at 0.2 C. The extended π-conjugation of the material contributes to enhancement of the electrochemical performance (155 mA h g at 10 C). Moreover, density functional theory calculations suggest that favorable synergistic reactions between multiple carbonyl groups and lithium ions can enhance the initial lithium ion intercalation potential. The described approach may provide a novel entry to next-generation organic electrode materials with relevance to lithium-ion batteries.
有机电极材料在可充电池中的应用引起了极大的关注，因为这些材料含有丰富的碳、氢和氧元素。然而，有机电极在有机溶剂中高度溶解。本文报道了一种 2,3,5,6-四苯甲酰亚胺-1,4-苯醌（TPB）有机电极，其中刚性基团与分子苯醌骨架配位。该材料不溶于非质子电解质，在 0.2C 下经过 100 次循环后具有 91.4%（204mA h g ）的高容量保持率。该材料的扩展π共轭有助于增强电化学性能（在 10C 时为 155mA h g ）。此外，密度泛函理论计算表明，多个羰基基团与锂离子之间的有利协同反应可以提高初始锂离子嵌入电位。所描述的方法可能为锂离子电池的下一代有机电极材料提供一个新的途径。
