Efficient and Homogenous Precipitation of Sulfur Within a 3D Electrospun Heterocatalytic Rutile/Anatase TiO_(2‑x) Framework in Lithium–Sulfur Batteries  

作　　者：Ping Feng Kang Dong Yaolin Xu Xia Zhang Haojun Jia Henrik Prell Michael Tovar Ingo Manke Fuyao Liu Hengxue Xiang Meifang Zhu Yan Lu 

机构地区：[1]Institute of Electrochemical Energy Storage,Helmholtz-Zentrum Berlin für Materialien und Energie,14109 Berlin,Germany [2]Department of Chemistry,Massachusetts Institute of Technology,Cambridge,MA 02139,USA [3]Department Structure and Dynamics of Energy Materials,Helmholtz-Zentrum Berlin für Materialien und Energie GmbH,14109 Berlin,Germany [4]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,People’s Republic of China [5]Institute for Technical and Environmental Chemistry,Friedrich-Schiller-Universit.t Jena,07743 Jena,Germany [6]Helmholtz Institute for Polymers in Energy Applications Jena(HIPOLE Jena),07743 Jena,Germany

出　　处：《Advanced Fiber Materials》2024年第3期810-824,共15页先进纤维材料（英文）

基　　金：funding enabled and organized by Projekt DEAL.This article is funded by China Scholarship Council,202006630007;Ping Feng,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,LK1702。

摘　　要：Lithium–sulfur(Li–S)batteries can potentially outperform state-of-the-art lithium-ion batteries,but their further development is hindered by challenges,such as poor electrical conductivity of sulfur and lithium sulfide,shuttle phenomena of lithium polysulfides,and uneven distribution of solid reaction products.Herein,free-standing carbon nanofibers embedded with oxygen-deficient titanium dioxide nanoparticles(TiO_(2-x)/CNFs)has been fabricated by a facile electrospinning method,which can support active electrode materials without the need for conductive carbon and binders.By carefully controlling the calcination temperature,a mixed phase of rutile and anatase was achieved in the TiO_(2-x)nanoparticles.The hybridization of anatase/rutile TiO_(2-x)and the oxygen vacancy in TiO_(2-x)play a crucial role in enhancing the conversion kinetics of lithium polysulfides(LiPSs),mitigating the shuttle effect of LiPSs,and enhancing the overall efficiency of the Li–S battery system.Additionally,the free-standing TiO_(2-x)/CNFs facilitate uniform deposition of reaction products during cycling,as confirmed by synchrotron X-ray imaging.As a result of these advantageous features,the TiO_(2-x)/CNFs-based cathode demonstrates an initial specific discharge capacity of 787.4 mAh g^(−1)at 0.5 C in the Li–S coin cells,and a final specific discharge capacity of 584.0 mAh g^(−1) after 300 cycles.Furthermore,soft-packaged Li–S pouch cells were constructed using the TiO_(2-x)/CNFs-based cathode,exhibiting excellent mechanical properties at different bending states.This study presents an innovative approach to developing free-standing sulfur host materials that are well suited for flexible Li–S batteries as well as for various other energy applications.

关 键 词：Li–S batteries TiO_(2-x) Electrospinning Heterocatalyst X-ray tomography 

分 类 号：TM912[电气工程—电力电子与电力传动]