Highly integrated sulfur cathodes with strong sulfur/high-strength binder interactions enabling durable high-loading lithium-sulfur batteries  

作　　者：Arif Rashid Xingyu Zhu Gulian Wang Chengzhi Ke Sha Li Pengfei Sun Zhongli Hu Qiaobao Zhang Li Zhang 

机构地区：[1]College of Energy,Soochow Institute for Energy and Materials Innovations,Soochow University,Suzhou 215006,Jiangsu,China [2]Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen 361005,Fujian,China [3]State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China

出　　处：《Journal of Energy Chemistry》2020年第10期71-79,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(21875155,51675275,21703185 and 21473119);Q.B.Z.acknowledges the Leading Project Foundation of Science Department of Fujian Province(2018H0034);Shenzhen Science and Technology Planning Project(JCYJ20170818153427106).

摘　　要：The development of high-sulfur-loading Li-S batteries is a key prerequisite for their commercial applications.This requires to surmount the huge polarization,severe polysulfide shuttling and drastic volume change caused by electrode thickening.High-strength polar binders are ideal for constructing robust and long-life high-loading sulfur cathodes but show very weak interfacial interaction with non-polar sulfur materials.To address this issue,this work devises a highly integrated sulfur@polydopamine/highstrength binder composite cathodes,targeting long-lasting and high-sulfur-loading Li-S batteries.The super-adhesion polydopamine(PD)can form a uniform nano-coating over the graphene/sulfur(G-S)surface and provide strong affinity to the cross-linked polyacrylamide(c-PAM)binder,thus tightly integrating sulfur with the binder network and greatly boosting the overall mechanical strength/conductivity of the electrode.Moreover,the PD coating and c-PAM binder rich in polar groups can form two effective blockades against the effusion of soluble polysulfides.As such,the 4.5 mg cm−2 sulfur-loaded G-S@PD-c-PAM cathode achieves a capacity of 480 mAh g−1 after 300 cycles at 1 C,while maintaining a capacity of 396 mAh g−1 after 50 cycles at 0.2 C when the sulfur loading rises to 9.1 mg cm−2.This work provides a system-wide concept for constructing high-loading sulfur cathodes through integrated structural design.

关 键 词：Cross-linked high-strength polar binder Highly integrated electrode structure High-sulfur-loading Li-S battery Polydopamine nano-bonding layer Strong sulfur/binder interaction 

分 类 号：TQ437[化学工程] TM912[电气工程—电力电子与电力传动]