电化学2023，Vol.29Issue(4)：56-67,12.DOI:10.13208/j.electrochem.2217004
紫外光引发原位交联多功能粘结剂构筑稳固硫正极
Ultraviolet-Initiated In-Situ Cross-Linking of Multifunctional Binder Backbones Enables Robust Lithium-Sulfur Batteries
摘要
Abstract
Lithium-sulfur(Li-S)batteries show attractive prospects owing to their high theoretical energy density,but their commercialization still faces such challenges as lithium polysulfides shuttling,severe volume change and consider-able polarization.These stubborn issues place higher demands on each component in the battery,such as the development of multifunctional binders with superior mechanical properties.Herein,ethoxylated trimethylolpropane triacrylate was firstly introduced into sulfur cathodes,and in-situ cross-linked by ultraviolet(UV)curing combined with traditional polyvinylidene difluoride binder(i.e.,forming a binary binder,denoted as c-ETPTA/PVDF)to construct high-loading and durable Li-S batteries.The covalently cross-linked ETPTA framework not only signifi-cantly enhances the mechanical strength of the laminate,but also offers a strong chemical affinity for lithium poly-sulfides due to the abundant oxygen-containing groups.Moreover,the moderate interaction force between ether oxygen bonds and Li+further accelerates the Li+transport.As such,the S-c-ETPTA/PVDF electrode exhibited an ultralow attenuation rate of 0.038％at 2 C over 1000 cycles.Even under a sulfur loading of 7.8 mgs cm-2,an average areal capacity of 6.2 mAh.cm-2 could be achieved after 50 cycles.This work indicates that light-assisted curing technology holds great promise in the fabrication of robust and high-energy-density Li-S batteries.关键词
锂硫电池/紫外固化/原位交联/多功能粘结剂/高强度电极Key words
Lithium-sulfur batteries/Ultraviolet curing/In-situ cross-linked/Multifunctional binder/High-strength electrode引用本文复制引用
李莎,湛孝,王顾莲,王慧群,熊伟明,张力..紫外光引发原位交联多功能粘结剂构筑稳固硫正极[J].电化学,2023,29(4):56-67,12.基金项目
The authors acknowledge financial support from the National Natural Science Foundation of China(NSFC,21875155),the support of National Key Research and Development Program of China(2021YFA1201502),and the support of Nanqiang Young Top-notch Talent Fellowship in Xiamen University. （NSFC,21875155）
