Multilevel structured carbon film as cathode host for Li-S batteries with superhigh-areal-capacity

• 作者: Bin He Wen-Cui Li Zhi-Yuan Chen Lei Shi Yu Zhang Ji-Li Xia An-Hui Lu
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Research Articles
• 页码范围: 1273-1279
• 页数: 7页
• 语种: 英文

摘要

The commercialization of lithium-sulfur (Li-S) battery could be accelerated by designing advanced sulfur cathode with high sulfur utilization and stable cycle life at a high sulfur loading.To allow the energy density of Li-S batteries comparable to that of commercial Li-ion batteries,the areal capacity of sulfur cathode should be above 4 mA·h·cm-2.In general,a high sulfur loading often causes rapid capacity fading by slowing electron/ion transport kinetics,catastrophic shuttle effect and even cracking the electrodes.To address this issue,herein,a multilevel structured carbon film is built by covering highly conductive CNTs and hollow carbon nanofiber together with carbon layer via chemical vapor deposition.The self-standing carbon film exhibits well-interweaved conductive network,hollow fibrous structure and abundant N,O co-doped active sites,which combine the merits of high electronic conductivity (1,200 S·m-1),high porosity and polar characteristic in one host.Benefiting from this attractive multilevel structure,the obtained sulfur cathode based on the carbon film host shows an ultra-high areal capacity of 8.9 mA·h·cm-2 at 0.2 C with outstanding cyclability over 60 cycles.This work shed light on designing advanced sulfur host for Li-S batteries with high areal capacity and high cycle stability,and might make a contribution to the commercialization of Li-S batteries.