Practical SPAN||Li cells enabled by insitu polymerized electrolyte

IF 9 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Yawei Guo, Weijing Zuo, Xiangkun Wu, Lan Zhang
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引用次数: 0

Abstract

Sulfurized polyacrylonitrile (SPAN) is a promising cathode material for long-life lithium-sulfur batteries (LSBs) due to its enhanced electronic conductivity as well as the eliminated shuttle effect. However, the uncontrollable lithium dendrite issue as well as slow kinetics of thick electrodes still hinders its practical application. Herein, an polymerized electrolyte (PGE) based on vinyl carbonate and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is designed and prepared to enhance the plating/stripping stability of the metal lithium while ensuring the cathode/electrolyte interfacial ion transportation. The optimized electrolyte, PGE-D, shows a satisfying ionic conductivity of 0.46 mS/cm at 25 °C; in the meantime, the polymer matrix hinders the diffusion of TFSI anion and results in a high Li transference number () of 0.73. Benefiting from the high affinity of the flowable PGE precursor to the thick SPAN cathode as well as enhanced lithium compatibility, the Li||SPAN battery with high areal loading of 14.1 mg/cm exhibits a high reversible specific capacity of 556.5 mAh/g and retains 76.3% of its capacity after 90 cycles.
采用原位聚合电解质的实用 SPAN|| 锂电池
硫化聚丙烯腈(SPAN)具有更强的电子传导性,并能消除穿梭效应,因此是一种很有前途的长寿命锂硫电池(LSB)正极材料。然而,锂枝晶的不可控性以及厚电极的缓慢动力学特性仍然阻碍着它的实际应用。本文设计并制备了一种基于碳酸乙烯酯和双(三氟甲烷磺酰基)亚胺锂(LiTFSI)的聚合电解质(PGE),以增强金属锂的电镀/剥离稳定性,同时确保阴极/电解质界面的离子传输。优化后的电解质 PGE-D 在 25 °C 时的离子电导率为 0.46 mS/cm,令人满意;同时,聚合物基质阻碍了 TFSI 阴离子的扩散,使锂离子转移数高达 0.73。得益于可流动 PGE 前体与厚 SPAN 正极的高亲和性以及锂兼容性的增强,锂||SPAN 电池在 14.1 mg/cm 的高面积负载下显示出 556.5 mAh/g 的高可逆比容量,并在 90 次循环后保持 76.3% 的容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials Today Energy
Materials Today Energy Materials Science-Materials Science (miscellaneous)
CiteScore
15.10
自引率
7.50%
发文量
291
审稿时长
15 days
期刊介绍: Materials Today Energy is a multi-disciplinary, rapid-publication journal focused on all aspects of materials for energy. Materials Today Energy provides a forum for the discussion of high quality research that is helping define the inclusive, growing field of energy materials. Part of the Materials Today family, Materials Today Energy offers authors rigorous peer review, rapid decisions, and high visibility. The editors welcome comprehensive articles, short communications and reviews on both theoretical and experimental work in relation to energy harvesting, conversion, storage and distribution, on topics including but not limited to: -Solar energy conversion -Hydrogen generation -Photocatalysis -Thermoelectric materials and devices -Materials for nuclear energy applications -Materials for Energy Storage -Environment protection -Sustainable and green materials
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