3,4,9,10-苝四甲酸二酐(PTCDA)用作钠离子电池正极材料的电化学性能研究

Studies on the electrochemical properties of 3,4,9,10-perylene tetracarboxylic dianhydride used as sodium ion battery electrode material

采用含有羰基的有机共轭分子3,4,9,10-苝四甲酸二酐(PTCDA)为正极,金属钠为负极组装了钠离子电池,用电化学交流阻抗及循环伏安法研究了其电化学性能.结果表明:PTCDA电极材料的离子电导率较低,大约为1.38×10^-6 S·cm^-1,不适合用于大电流密度充放电的电动汽车动力电池,但在小电流密度充放电状态下,具有良好的离子和电子传输性能及优异的钠离子脱/嵌性能;在电流密度为0.1 A·g^-1时,首次放电容量达120 mAh·g^-1,接近其理论比容量135 mAh·g^-1,有望应用于移动电话、笔记本电脑等小型便携式电子器件电源中.

The sodium ion battery was assembled using the 3,4,9,10-perylene tetracarboxylic dianhydride(PTCDA) as the positive electrode material, and sodium metal as negative electrode. The electrochemical properties were studied by electrochemical impedance and cyclic voltammetry. The results show that the ionic conductivity of PTCDA electrode material is low about 1.38× 10^-6 S·cm^-1, which is not suitable for power batteries of electric vehicles using high current charge and discharge density. However, PTCDA electrode material has good ion and electron transport performance and excellent sodium ion deblocking properties under the condition of low current density. The first discharge capacity is 120 mAh·g^-1 as the current density is 0.1 A·g^-1, which close to its theoretical specific capacity of 135 mAh·g^-1. This is expected to be used as the power sources in mobile phones, laptops and the other small portable electronic devices.