高容量锂离子电池正极复合材料pillar[5]quinone/CMK-3的制备  

Preparation of Cathode Composites Pillar[5]quinone/CMK-3 for High-Capacity Lithium-Ion Batteries

作　　者：熊文旭 掌学谦 黄苇苇 XIONG Wen-Xu;ZHANG Xue-Qian;HUANG Wei-Wei(School Environmental and Chemical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;State Key Laboratory Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,Hebei 066004,China)

机构地区：[1]燕山大学环境与化学工程学院,秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《无机化学学报》2020年第2期269-275,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21403187,21875206);中国博士后科学基金(No.2015T80229)资助

摘　　要：以有机醌类化合物柱[5]醌(pillar[5]quinone,P5Q)作为锂离子电池的正极材料,探索了其储锂性能。实验结果表明,P5Q首圈放电容量达到了431 mAh·g^-1,显示出100%的活性位点利用率。然而,P5Q在电解液中的溶解会导致循环过程中容量的衰减。采用超声法将P5Q填入有序介孔碳CMK-3的孔道,制备了P5Q/CMK-3复合材料,以此减少P5Q与电解液的接触,从而减缓了P5Q的溶解速率,提高了电池的循环稳定性。P5Q/CMK-3复合材料100次充放电循环后容量为300 mAh·g^-1,保持率高达71%,说明了该优化方法效果显著,提高了P5Q在锂离子电池中的实际应用价值。Quinone compound called pillar[5]quinone(P5Q)was chosen as cathode to explore lithium storage performance.Experimental data indicated that the initial capacity reached 431 mAh·g^-1,displaying 100%utilization rate of active sites.Nevertheless,P5Q was easily dissolved when exposed to the electrolyte,which resulted in rapid decay of capacity.For addressing this issue,encapsulation method was employed.We chose CMK-3 as porous carbon material in this study for its uniform pores and moderate pore size.Herein,P5Q was filled into the holes of CMK-3,and then obtaining the P5Q/CMK-3 nanocomposites.The experiment results showed that the pouring method effectively slowed the dissolution of P5Q in electrolyte.After 100 cycles,the discharge capacity of P5Q/CMK-3 composites maintained at 300 mAh·g^-1,the retention was as high as 71%,and coulombic efficiency was around 100% during the test period.

关 键 词：醌 固载 锂离子电池 高容量 

分 类 号：O646[理学—物理化学]