锂硫电池中CNTs-CNFs夹层对多硫化物的捕获和加速转化机理
Capture and accelerated conversion mechanism of polysulfides by CNTs-CNFs interlayer in lithium-sulfur batteries
陈磊 1袁业辉 1宋瑞 1张超1
作者信息
- 1. 天津工业大学纺织科学与工程学院,天津 300387
- 折叠
摘要
为有效抑制多硫化锂(LiPSs)的穿梭效应,通过静电纺丝、电化学沉积和化学气相生长技术在碳纳米纤维(CNFs)上垂直生长碳纳米管(CNTs),开发了一种超薄、轻质的多功能三维多层交联碳纳米纤维-碳纳米管(CNTs-CNFs)夹层,并研究CNTs-CNFs对锂硫电池(LSBs)电化学性能的影响.研究结果表明:CNTs-CNFs薄膜优异的导电性和丰富的孔隙结构为LSBs提供了均匀的导电网络和LiPSs的吸附过滤屏障,与无夹层相比,含有CNTs-CNFs夹层的电池具有更优异的容量保持率和循环稳定性,在0.2 C电流密度下具有1 296.7mA·h/g的初始放电比容量,在100次循环后仍能提供了 864.7 mA·h/g的放电比容量,容量保持率为66.68％.
Abstract
In order to effectively suppress the shuttle effect of lithium polysulfides(LiPSs),carbon nanotubes(CNTs)were vertically grown on carbon nanofibers(CNFs)by electrospinning,electrochemical deposition and chemical va-por growth techniques.An ultra-thin,lightweight multi-functional three-dimensional cross-linked carbon nanofibers-carbon nanotubes(CNTs-CNFs)interlayer was developed to study the effect of CNTs-CNFs on the electrochemical properties of lithium-sulfur batteries(LSBs).The research results indicate that the excellent conductivity and abundant pore structure of CNTs-CNFs film provide uniform conductive network for LSBs and adsorption filtration barrier for LiPSs.Compared with the battery without interlayer,the battery with CNTs-CNFs interlayer has better capacity retention and cycle stability.It has an initial specific discharge capacity of 1 296.7 mA·h/g at a current density of 0.2 C,and can still provide a specific discharge capacity of 864.7 mA·h/g after 100 cycles,and the capacity retention rate is 66.68％.
关键词
多硫化锂(LiPSs)/碳纳米纤维-碳纳米管(CNTs-CNFs)/夹层/三维多层交联/锂硫电池(LSBs)Key words
lithium polysufide(LiPSs)/carbon nanofibers-carbon nanotubes(CNTs-CNFs)/interlayer/3D multilayer cross-linked/lithium-sulfur batteries(LSBs)引用本文复制引用
基金项目
中国博士后科学基金资助项目(2018M640240)
中国博士后科学基金资助项目(2019T120189)
出版年
2024
国家科技期刊平台
NSTL
万方数据