Confining Sulfur in Integrated Composite Scaffold with Highly Porous Carbon Fibers/Vanadium Nitride Arrays for High‐Performance Lithium–Sulfur Batteries,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Confining Sulfur in Integrated Composite Scaffold with Highly Porous Carbon Fibers/Vanadium Nitride Arrays for High‐Performance Lithium–Sulfur Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-10 , DOI: 10.1002/adfm.201706391
Yu Zhong ₁ , Dongliang Chao ₂ , Shengjue Deng ₁ , Jiye Zhan ₁ , RuYi Fang ₃ , Yang Xia ₃ , Yadong Wang ₄ , Xiuli Wang ₁ , Xinhui Xia ₁ , Jiangping Tu ₁

Affiliation

Increasing the utilization efficiency of sulfur electrodes and suppressing the “shuttle effect” of intermediate polysulfides are the key challenge for high‐performance lithium–sulfur batteries (LSBs). Herein a facile combined strategy is reported to fabricate novel porous carbon fibers/vanadium nitride arrays (PCF/VN) composite scaffold for the storage of sulfur via a facile chemical etching united solvothermal–supercritical fluid method. More active sulfur can be stored in the PCF/VN backbone and dual blocking effects associated with “physical block and chemical absorption” for polysulfides are achieved in the PCF/VN/S integrated electrode. The PCF with highly porous structure provides large space to accommodate active sulfur and possesses cross‐linked maze channels to physically immobilize the polysulfide species. The VN nanobelt arrays demonstrate strong ability for chemically anchoring the polysulfides, thus retarding the shuttle effect. Due to the unique structure and dual confining effect, the designed PCF/VN/S electrode shows a high reversible capacity of 1310.8 mA h g⁻¹ at 0.1 C, an extended cycle life (1052.5 mA h g⁻¹ after 250 cycles) as well as enhanced rate capability, much better than other counterparts (CF/VN/S, PCF/S, and CF/S). This work opens a new door for fabricating high‐performance integrated electrodes for LSBs.

中文翻译：

高性能锂-硫电池用高多孔碳纤维/氮化钒阵列将复合材料约束在脚手架中的硫

提高硫电极的利用效率并抑制中间多硫化物的“穿梭效应”是高性能锂硫电池（LSB）的关键挑战。在此，据报道，一种简便的组合策略可通过一种新型的化学蚀刻联合溶剂热超临界流体方法制造新颖的多孔碳纤维/氮化钒阵列（PCF / VN）复合支架，用于硫的存储。更多的活性硫可以存储在PCF / VN骨架中，并且在PCF / VN / S集成电极中实现了与多硫化物的“物理阻断和化学吸收”相关的双重阻断作用。具有高度多孔结构的PCF提供了容纳活性硫的大空间，并拥有交联的迷宫通道以物理方式固定多硫化物。VN纳米带阵列显示出强大的化学锚定多硫化物的能力，从而阻碍了穿梭效应。由于独特的结构和双重约束效应，设计的PCF / VN / S电极显示出1310.8 mA hg的高可逆容量在0.1 C时为^-1，具有更长的循环寿命（250个循环后为1052.5 mA hg ^-1）以及增强的倍率能力，远优于其他同类产品（CF / VN / S，PCF / S和CF / S）。这项工作为制造用于LSB的高性能集成电极打开了一扇新门。

更新日期：2018-01-10

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11