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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A simple L-cysteine-assisted method for the growth of MoS_2 nanosheets on carbon nanotubes for high-performance lithium ion batteries
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A simple L-cysteine-assisted method for the growth of MoS_2 nanosheets on carbon nanotubes for high-performance lithium ion batteries

机译：一种简单的L-半胱氨酸辅助方法，用于在高性能锂离子电池的碳纳米管上生长MoS_2纳米片。

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摘要

We introduce a simple process to synthesize few-layered MoS_2 nanosheets supported on coaxial carbon nanotubes through an l-cysteine-assisted hydrothermal route, in which l-cysteine, a cheap and ordinary amino acid, plays a fundamental role in controlling the morphology of the hybrid material and the binder to help the growth of MoS_2 nanosheets on the surface of the carbon nanotubes. It is also demonstrated that the polypeptide formed by l-cysteine can be transformed into amorphous carbon by heat treatment under an inert atmosphere. The materials exhibit high capacity and excellent cycling performance when used as anode materials for lithium ion batteries. The specific capacity of a composite with 1:4 molar ratio of MoS_2 to carbon nanotubes is 736.5 mAh g~(-1) after the first cycle, increased for several initial cycles, and remains at 823.4 mAh g~(-1) even after 30 cycles, when cycled at a current density of 100 mA g~(-1). At a very high current density of 1600 mA g~(-1), the material shows a stable capacity of approximately 530 mAh g~(-1) after 30 cycles. The noteworthy improvement in the electrochemical performance of the material can be attributed to their unique structure and the synergistic effects of amorphous carbon and few-layered MoS_2.
机译：我们介绍了一种简单的方法，通过l-半胱氨酸辅助的水热途径合成同轴碳纳米管上负载的几层MoS_2纳米片，其中l-半胱氨酸是一种廉价且普通的氨基酸，在控制分子的形态方面起着基本作用杂化材料和粘合剂，以帮助MoS_2纳米片在碳纳米管表面上生长。还证明了由L-半胱氨酸形成的多肽可以通过在惰性气氛下的热处理而转化为无定形碳。当用作锂离子电池的负极材料时，这些材料表现出高容量和出色的循环性能。在第一个循环后，MoS_2与碳纳米管摩尔比为1：4的复合材料的比容量为736.5 mAh g〜（-1），在最初的几个循环中均增加，甚至在之后仍保持在823.4 mAh g〜（-1）。以100 mA g〜（-1）的电流密度循环时，最多30个循环。在1600 mA g〜（-1）的极高电流密度下，该材料在30个循环后显示出约530 mAh g〜（-1）的稳定容量。材料电化学性能的显着改善可归因于其独特的结构以及无定形碳和少量MoS_2的协同作用。

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