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 

机构地区：[1]State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian,116024,China

出　　处：《Nano Research》2021年第5期1273-1279,共7页纳米研究（英文版）

基　　金：This work was supported by the National Science Fund for the National Natural Science Foundation of China(Nos.21776041 and 21875028);Cheung Kong Scholars Programme of China(No.T2015036).

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 (1200·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.

关 键 词：multilevel structure carbon film sulfur host CONDUCTIVITY areal capacity 

分 类 号：TM912[电气工程—电力电子与电力传动]