Calix[6]quinone as high-performance cathode for lithium-ion battery

高性能锂离子电池正极Calix[6]quinone（英文）

Organic quinone compounds have attracted wide attention due to their high theoretical capacities.Here,a novel cyclic macromolecular calix[6]quinone(C6Q),which possesses 6 p-quinone units and can provide 12 electrochemical active sites,has been applied as a promising cathode material in lithium ion batteries(LIBs).The as-fabricated LIBs exhibited an initial specific capacity as high as 423 mA h g^-1(Ctheo=447 mA h g^-1)at 0.1 C.After 100 cycles,the capacity of C6Q maintained at 216 mA h g^-1,and even after 300 cycles,C6Q still achieved a high specific capacity of 195 mA h g^-1 with negligible capacity fading(as compared with the 100th cycle).Due to the large capacity and wide electrochemical window,C6Q can deliver a specific energy up to 1201 W h kg^-1.In addition,the method of immobilizing C6Q with ordered mesoporous carbon(OMC)CMK-3 could further enhance the electrochemical performance of C6Q.

有机醌类化合物因其具有高的理论容量值而引起了人们的广泛关注.本文合成了一种新型的环状大分子Calix[6]quinone(C6Q),它由6个对苯醌单元组成,可提供12个电化学位点,是一种极具发展前景的锂离子正极材料.C6Q在0.1 C的电流密度下展示了高达423 mA h g^-1的初始放电比容量(理论放电比容量为447 mA h g^-1).经过100圈充放电循环之后,它的容量保持在216 mA h g^-1;经过300次循环之后,仍然拥有195 mA h g^-1的高容量.C6Q具有高容量和宽的电化学窗口,因此可以提供高达1201 W h kg^-1的能量密度.此外,使用有序介孔碳CMK-3固载C6Q的方法可以进一步提高C6Q的电化学性能.