Interface-reinforced high-capacity fiber cathode for wearable Li-S batteries  

作　　者：Lei Huang Tianzhu Zhou Siyu Zhu Tianqi Yang Xuhui Zhou Bing He Shuai Wang Wei Yan Lei Wei 

机构地区：[1]School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore 639798,Singapore [2]School of Materials Science and Engineering,Nanyang Technological University,Singapore 639798,Singapore [3]Department of Physics,City University of Hong Kong,Hong Kong 999077,China [4]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China

出　　处：《National Science Review》2024年第10期47-56,共10页国家科学评论（英文版）

基　　金：supported by the Singapore Ministry of Education Academic Research Fund Tier 2(MOE2019-T2-2-127,MOE-T2EP50120-0002 and MOE-T2EP50123-0014);the Singapore Ministry of Education Academic Research Fund Tier 1(RG62/22);the National Natural Science Foundation of China(52450017 and 52202167);A^(*)STAR under AME IRG(A2083c0062);A^(*)STAR under IAF-ICP Programme I2001E0067;the Schaeffler Hub for Advanced Research at NTU,the IDMxS(Institute for Digital Molecular Analytics and Science)by the Singapore Ministry of Education under the Research Centres of Excellence scheme,and the NTU-PSL Joint Lab collaboration.

摘　　要：Fiber-shaped Li-S batteries are attractive for constructing smart textiles as flexible power solutions due to their high theoretical specific capacit y,flexibilit y and wearability.However,severe interfacial issues,such as the shuttle effect of polysulfides on the cathode side,lead to capacity decay and poor lifespan of the batteries.Herein,we report a fiber-shaped composite cathode with collaborative interface interactions to maintain electrode integrity and boost electrochemical performance.In this architecture,nanosulf ur-poly vinylpy rrolidone(nanoS-PVP)particles are uniformly implanted into the few-layer Ti_(3)C_(2)T_(x)with outstanding electrical conductivity and then coated on aluminum(Al)fiber current collectors.Impressively,nanoS and soluble polysulfides are restricted to the cathode side via synergy physical confinement and chemical adsorption of Ti_(3)C_(2)T_(x).The PVP chains on the surface of the nanoS prevent the sulfur from agglomeration and bridge the Ti_(3)C_(2)T_(x)by abundant hydrogen bonds.The enhanced interface endows the cathode with excellent mechanical flexibility,good adsorption of polysulfides and fast reaction kinetics.Consequently,the prepared Ti_(3)C_(2)T_(x)/nanoS-PVP@Al cathode exhibits excellent cycling performance(capacity retention of 92.8%after 1000 cycles at 1 C),high-rate capacity(556.2 mAh g^(-1)at 2.0 C)and high linear capacity(22.9 mAh m^(-1)).Additionally,the fiber-shaped Li-S battery works effectively under deformation and high/low-temperature conditions.It can be integrated into the fabric to power light emitting diodes or charge a smartphone wirelessly.

关 键 词：Li-S batteries flexible electrodes interface interactions fiber-shaped devices energy storage 

分 类 号：TM912[电气工程—电力电子与电力传动]