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Plasma-polymerized C60-coated CNT interlayer with physical and chemical functions for lithium–sulfur batteries
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-06-27 , DOI: 10.1016/j.cej.2020.126075
Minh Xuan Tran , Ryanda Enggar Anugrah Ardhi , Guicheng Liu , Ji Young Kim , Joong Kee Lee

The electrochemical application of plasma-induced polymerized fullerene (PC60), wherein C60-derived radicals play physical and chemical functions, representing an important frontier in fullerene derivatives. We prepared a dual-functional interlayer of a gradationally PC60-coated carbon nanotube (CNT) matrix, where the population of C60-originating carbon moieties decreased linearly across the CNT@PC60 from the separator to the sulfur electrode in a lithium–sulfur battery (LSB). The three-dimensional CNT@PC60 interlayer acted as both a physical ionic shield, impeding the shuttle effect, and a catalytic immobilizer, enhancing the kinetics of sulfur conversion. The synergistic effectiveness of the dual perm-selective CNT@PC60 interlayers in confining polysulfide species enabled delivery by the LSB with a high specific capacity of 829 mAh g−1 and an ultra-low decay rate of 0.066% per cycle over 400 cycles at 5C. The role of PC60 in this superior electrochemical performance is the different physical and chemical characteristics of the ends of the interlayer. The PC60-rich side acts as a physical barrier with a mean pore size of 0.7 nm, which enables the penetration of lithium ions only without polysulfide intrusion. Meanwhile, the PC60-poor side formed a catalytic immobilizer because of its higher chemical functionalized degree.



中文翻译:

用于锂硫电池的具有物理和化学功能的等离子聚合C 60涂层CNT中间层

等离子体诱导的聚合富勒烯(PC 60)的电化学应用,其中C 60衍生的自由基起物理和化学作用,代表了富勒烯衍生物的重要前沿。我们准备了渐变PC 60涂层的碳纳米管(CNT)基质的双功能中间层,其中,在锂离子电池中,从隔板到硫电极的整个CNT @ PC 60上,源自C 60的碳部分的数量线性减少。硫磺电池(LSB)。三维CNT @ PC 60中间层既充当物理离子屏蔽层(阻止穿梭效应),又充当催化固定剂,从而增强了硫转化的动力学。双重电渗选择性CNT @ PC 60中间层在限制多硫化物物种方面的协同效力使LSB能够以829 mAh g -1的高比容量和在400次循环下每循环0.066%的超低衰减率进行输送5C。PC 60在这种出色的电化学性能中的作用是中间层末端的不同物理和化学特性。富含PC 60的一面充当物理屏障,平均孔径为0.7 nm,这仅使锂离子能够渗透而无多硫化物侵入。同时,PC60贫侧由于其较高的化学官能度而形成了催化固定剂。

更新日期:2020-06-27
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