High performance lithium-ion batteries with pillar[5]quinone/ion-liquid system
High performance lithium-ion batteries with pillar[5]quinone/ion-liquid system
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柱[5]醌/离子液体体系高性能锂离子电池
DOI：
10.1016/j.orgel.2020.105743
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发表时间：
2020-08
影响因子：
3.2
通讯作者：
Weiwei Huang
中科院分区：
文献类型：
--
作者：
Huimin Sun;Wenxu Xiong;Wenjun Zhou;Weisheng Zhang;Liqiu Wang;Weiwei Huang
正极容量是锂离子电池(LIB)的一个短板问题。具有高理论容量的有机醌正极材料可以有效地解决这一问题。选择理论容量为446mAHg−1的柱状[5]苯二酚(P5Q)作为阴极，但其在传统有机电解液中的溶解速度较快。近年来，离子液体被报道对有机化合物有微弱的溶解作用。同时，它们的非挥发性和不可燃性的特性可以降低传统有机电解液在LIBS中使用的安全风险。在本工作中，LiBS/LiPF6/[PY13][TFSI](锂Hexafluorophosphate/N-methyl-N-propylpyrrolidiniumbis(trifluoromethanesulfonyl)amide)电解液和P5Q正极)表现出优异的电化学性能，主要体现在稳定的循环性能(200次循环后在0.2C电流密度下保持284mAhg−1，容量保持率为70%)和高倍率性能(2℃下达到220mAhg−1)。这一策略将进一步实现有机LIBS的实际应用。
The capacity of cathode is a short slab issue of lithium-ion batteries (LIBs). Organic quinone cathode materials with high theoretical capacities could effectively solve the problem. Here, pillar[5]quinone (P5Q) with high theoretical capacity of 446 mAh g−1is chosen as the cathode, while it is puzzled over fast dissolution rate in traditional organic electrolytes. Recently, ionic liquids have been reported the weak dissolution towards organic compounds. At the same time, their peculiarities of non-volatilization and non-combustibility could reduce the safety risk of using traditional organic electrolytes in LIBs. In this work, LIBs combined with LiPF6/[PY13][TFSI] (Lithium Hexafluorophosphate/N-methyl-N-propylpyrrolidiniumbis(trifluoromethanesulfonyl)amide) electrolyte and P5Q cathode show excellent electrochemical performance, principally reflected in stable cycling performance (maintain at 284 mAh g−1at 0.2 C current density after 200 cycles with capacity retention of 70%) and high rate property (reach 220 mAh g−1at 2 C). This strategy would further realize the practical application of organic LIBs.
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