材料科学
碳纳米纤维
碳纳米管
电化学
催化作用
锂(药物)
兴奋剂
化学工程
吸附
密度泛函理论
纳米纤维
纳米颗粒
纳米技术
硫黄
碳纤维
电极
复合材料
有机化学
化学
物理化学
计算化学
光电子学
医学
内分泌学
工程类
复合数
冶金
作者
Xin Dai,Guangjun Lv,Zhen Wu,Xu Wang,Yan Liu,Junjie Sun,Qichao Wang,Xuyang Xiong,Yongning Liu,Chaofeng Zhang,Sen Xin,Yuanzhen Chen,Tengfei Zhou
标识
DOI:10.1002/aenm.202300452
摘要
Abstract The key means to improve the performance of lithium–sulfur batteries (LSBs) is to reduce the internal resistance by building an electronic/ionic pathway and to accelerate the conversion kinetics of lithium polysulfides (LiPSs) through modulation of interface functions. Herein, inspired by a grass root system, a flexible hierarchical CNF‐CNT (carbon nanofiber‐carbon nanotube) membrane decorated with Co‐doped NiS 2 nanoparticles (Co‐NiS 2 @CNF‐CNT) is designed as an interlayer for LSBs, in which the in situ grown CNTs (root hairs) are wound on CNF (roots). Density functional theory (DFT) calculations show that Co doping introduces electron‐deficient regions at the doping sites in NiS 2 , thus improving chemical adsorption and catalytic activities toward LiPSs. The cell pairs with the Co‐NiS 2 @CNF‐CNT interlayer exhibit a high rate performance of 951.4 mAh g −1 at 3 C, a reversible capacity of 944.1 mAh g −1 after 500 cycles at 0.2 C, and a prolonged cycle life of 3000 cycles at 5 C. More importantly, an areal capacity of 7.96 mAh cm −2 is achieved with a sulfur loading of 9.6 mg cm −2 . This work provides a strategy for enhancing the electrochemical performance of LSBs by combining 3D hierarchical conductive skeletons and electron‐deficient functional adsorption and catalysis materials.
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