将杯[4]醌(Calix[4]quinone,C4Q)通过灌注法与有序介孔炭CMK-3制备成纳米复合材料,可抑制其在常规有机电解液中的溶解。为了进一步提升其电化学性能,本文在C4Q/CMK-3复合材料中加入单壁碳纳米管(SWCNTs),减少了CMK-3的用量,并代替导电炭...将杯[4]醌(Calix[4]quinone,C4Q)通过灌注法与有序介孔炭CMK-3制备成纳米复合材料,可抑制其在常规有机电解液中的溶解。为了进一步提升其电化学性能,本文在C4Q/CMK-3复合材料中加入单壁碳纳米管(SWCNTs),减少了CMK-3的用量,并代替导电炭黑Super-P作为导电剂,通过脱泡搅拌法制备了C4Q/CMK-3/SWCNTs复合材料。研究表明,当m(C4Q)∶m(CMK-3)∶m(SWCNTs)为1∶1∶1时,电化学性能最佳,0. 1 C电流密度下循环100圈后,电池的容量保持为238. 7 m A·h/g,当电流密度增大到1 C时,放电容量仍有260 m A·h/g,这是由于SWCNTs在复合材料C4Q/CMK-3中构建了三维导电网络,增强了电极的稳定性,降低了电池内阻,从而提升了电池的循环性能与倍率性能。展开更多
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 electrochem...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.展开更多
文摘将杯[4]醌(Calix[4]quinone,C4Q)通过灌注法与有序介孔炭CMK-3制备成纳米复合材料,可抑制其在常规有机电解液中的溶解。为了进一步提升其电化学性能,本文在C4Q/CMK-3复合材料中加入单壁碳纳米管(SWCNTs),减少了CMK-3的用量,并代替导电炭黑Super-P作为导电剂,通过脱泡搅拌法制备了C4Q/CMK-3/SWCNTs复合材料。研究表明,当m(C4Q)∶m(CMK-3)∶m(SWCNTs)为1∶1∶1时,电化学性能最佳,0. 1 C电流密度下循环100圈后,电池的容量保持为238. 7 m A·h/g,当电流密度增大到1 C时,放电容量仍有260 m A·h/g,这是由于SWCNTs在复合材料C4Q/CMK-3中构建了三维导电网络,增强了电极的稳定性,降低了电池内阻,从而提升了电池的循环性能与倍率性能。
基金the financial support of the National Natural Science Foundation of China (21875206 and 21403187)China Postdoctoral Science Foundation (2015T80229)the Natural Science Foundation of Hebei Province (B2019203487)
文摘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.
