文献类型：期刊文献

英文题名：Cost-Effective Water-Soluble Poly(vinyl alcohol) as a Functional Binder for High-Sulfur-Loading Cathodes in Lithium-Sulfur Batteries

作者：Liao, Junbin[1];Liu, Zhen[2];Wang, Jianli[3];Ye, Zhibin[4]

机构：[1]Laurentian Univ, Bharti Sch Engn, Sudbury, ON P3E 2C6, Canada;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Zhejiang Univ Technol, Coll Chem Engn, Hangzhou 310014, Peoples R China;[4]Concordia Univ, Dept Chem & Mat Engn, Montreal, PQ H3G 1M8, Canada

年份：2020

卷号：5

期号：14

起止页码：8272

外文期刊名：ACS OMEGA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000526342300058)】；

基金：We thank the funding support from the Canada Research Chair (CRC, Grant #230723) and the Natural Science and Engineering Research Council (NSERC) of Canada (Grant #477901-2015).

语种：英文

摘要：Binder, as one of the key components, plays a crucial role in improving the capacity and cycling performance of lithium- sulfur (Li-S) batteries. In this work, commercially available, low-cost, water-soluble polyvinyl alcohol (PVA) has been systematically investigated as a functional polymer binder for high-sulfur-loading cathodes, with the aim of enhancing sulfur utilization, reducing capacity decay, and extending cycling life of the cathodes. In comparison with polyvinylidene fluoride as a conventional binder, PVA shows a valuable polysulfide entrapping ability and a much stronger binding strength. Its superior polysulfide entrapping ability has been verified through theoretical density functional theory calculations and an experimental ex situ adsorption study. In electrochemical Li-S battery performance evaluation, at a sulfur loading density of 3.5 mg cm(-2), the sulfur cathode assembled with the PVA binder displays at 0.5 C a very slow capacity decay of only 0.010% per cycle over 250 cycles. Additionally, the strong binding strength of PVA allows the fabrication of thick sulfur cathodes with a high sulfur loading density of 10.5 mg cm(-2) , which shows a high areal capacity of 4.0 mA h cm(-2) and a high cycling stability (capacity decay of 0.1% per cycle). In consideration of the superior capacity retention and cycling performance of its enabled cathodes, the cost-effective PVA is a promising candidate for highsulfur-loading cathodes in practical applications.