Laser-Ablated Red Phosphorus on Carbon Nanotube Film for Accelerating Polysulfide Conversion toward High-Performance and Flexible Lithium–Sulfur Batteries,Small Methods

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Laser-Ablated Red Phosphorus on Carbon Nanotube Film for Accelerating Polysulfide Conversion toward High-Performance and Flexible Lithium–Sulfur Batteries
Small Methods ( IF 10.7 ) Pub Date : 2021-06-19 , DOI: 10.1002/smtd.202100215
Jeongyeon Lee ₁ , Hyeonjun Song ₂ , Kyung-Ah Min ₃ , Qianyi Guo ₄ , Daekyu Kim ₁ , Zijian Zheng ₄ , Byungchan Han ₃ , Youngjin Jung ₂ , Lawrence Yoon Suk Lee ₁

Affiliation

The use of a conducting interlayer between separator and cathode is one of the most promising methods to trap lithium polysulfides (LiPSs) for enhancing the performance of lithium–sulfur (Li–S) batteries. Red phosphorus nanoparticles (RP_EN)-coated carbon nanotube (CNT) film (RP_EN@CF) is reported herein as a novel interlayer for Li–S batteries, which shows strong chemisorption of LiPSs, good flexibility, and excellent electric conductivity. A pulsed laser ablation method is engaged for the ultrafast production of RP_EN of uniform morphology, which are deposited on the CNT film by a direct spinning method. The RP_EN@CF interlayer provides pathways for effective Li⁺ and electron transfer and strong chemical interaction with LiPSs. The S/RP_EN@CF electrode shows a superior specific capacity of 782.3 mAh g⁻¹ (3 C-rate) and good cycling performances (769.5 mAh g⁻¹ after 500 cycles at 1 C-rate). Density functional theory calculations reveal that the morphology and dispersibility of RP_EN are crucial in enhancing Li⁺ and electron transfer kinetics and effective trap of LiPSs. This work demonstrates the possibility of using the RP_EN@CF interlayer for the enhanced electrochemical performances of Li–S batteries and other flexible energy storage devices.

中文翻译：

碳纳米管薄膜上的激光烧蚀红磷用于加速多硫化物向高性能和柔性锂硫电池的转化

在隔膜和阴极之间使用导电夹层是捕获多硫化锂（LiPS）以提高锂硫（Li-S）电池性能的最有前途的方法之一。本文报道了红磷纳米粒子 (RP _EN ) 涂覆的碳纳米管 (CNT) 膜 (RP _EN @CF) 作为 Li-S 电池的新型中间层，它显示出对 LiPS 的强化学吸附、良好的柔韧性和优异的导电性。脉冲激光烧蚀方法用于超快生产均匀形态的 RP _EN，其通过直接旋转方法沉积在 CNT 膜上。RP _EN @CF 中间层为有效的 Li ⁺以及与 LiPS 的电子转移和强化学相互作用。S/RP _EN @CF 电极显示出 782.3 mAh g ^-1（3 C 倍率）的优异比容量和良好的循环性能（1 C 倍率下 500 次循环后为769.5 mAh g ^-1）。密度泛函理论计算表明，RP _EN的形态和分散性对于增强 Li ⁺和电子转移动力学以及 LiPS 的有效陷阱至关重要。这项工作证明了使用 RP _EN @CF 夹层来增强 Li-S 电池和其他柔性储能设备的电化学性能的可能性。

更新日期：2021-07-14

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