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. 2014 Jun 2;53(23):5892-6. doi: 10.1002/anie.201400032. Epub 2014 Feb 20.
Developing organic compounds with multifunctional groups to be used as electrode materials for rechargeable sodium-ion batteries is very important. The organic tetrasodium salt of 2,5-dihydroxyterephthalic acid (Na4DHTPA; Na4C8H2O6), which was prepared through a green one-pot method, was investigated at potential windows of 1.6-2.8 V as the positive electrode or 0.1-1.8 V as the negative electrode (vs. Na(+)/Na), each delivering compatible and stable capacities of ca. 180 mAh g(-1) with excellent cycling. A combination of electrochemical, spectroscopic and computational studies revealed that reversible uptake/removal of two Na(+) ions is associated with the enolate groups at 1.6-2.8 V (Na2C8H2O6/Na4C8H2O6) and the carboxylate groups at 0.1-1.8 V (Na4C8H2O6/Na6C8H2O6). The use of Na4C8H2O6 as the initial active materials for both electrodes provided the first example of all-organic rocking-chair SIBs with an average operation voltage of 1.8 V and a practical energy density of about 65 Wh kg(-1).
开发具有多功能基团的有机化合物，将其用作可再充电钠离子电池的电极材料非常重要。通过绿色一锅法制备的 2,5-二羟基对苯二甲酸的四钠盐（Na4DHTPA；Na4C8H2O6），在 1.6-2.8 V 的潜在窗口中作为正极或在 0.1-1.8 V 的潜在窗口中作为负极（相对于 Na(+)/Na）进行了研究，每种材料的稳定容量约为 180 mAh g(-1)，且具有出色的循环性能。电化学、光谱和计算研究的结合表明，在 1.6-2.8 V（Na2C8H2O6/Na4C8H2O6）处与烯醇化物基团和在 0.1-1.8 V（Na4C8H2O6/Na6C8H2O6）处与羧酸盐基团相关的可逆吸收/去除两个 Na(+)离子。使用 Na4C8H2O6 作为两个电极的初始活性材料，提供了首个具有平均工作电压为 1.8 V 和实际能量密度约为 65 Wh kg(-1)的全有机摇椅式 SIB 的示例。
