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

以有机醌类化合物柱5]醌(pillar5]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。

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

Quinone compound called pillar5]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.