Polymeric binders for the sulfur electrode compatible with ionic liquid containing electrolytes

被引：10

作者：

Hwa, Yoon ^{[1
,2
]}

Cairns, Elton J. ^{[1
,2
]}

机构：

[1] Lawrence Berkeley Natl Lab, Energy Storage & Distributed Resources Div, One Cyclotron Rd, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA

来源：

ELECTROCHIMICA ACTA | 2018年 / 271卷

关键词：

Lithium/sulfur cell; Energy storage; Polymeric binder; Ionic liquid; ENERGY-DENSITY; LITHIUM/SULFUR CELLS; LI/S CELLS; LONG-LIFE; BATTERIES; CATHODE; PERFORMANCE;

D O I：

10.1016/j.electacta.2018.03.040

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A novel ionic liquid-containing electrolyte has been demonstrated to improve charging efficiency, lifetime and safety of Li/S cells. However, the high viscosity of the ionic liquid can reduce the kinetics of the electrochemical process and degrade the wettability the S electrode by the electrolyte, which limits electrochemical utilization of the active S. To realize the advantages of the ionic liquid in the electrolyte, while maintaining good cell performances, we have investigated the critical properties of polymeric binders such as polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), carboxymethyl cellulose (CMC), polyacrylic acid (PAA) and lithium polyacrylate (LiPAA) for the S electrode operated in ionic liquid-containing electrolytes. The PAA binder electrode showed the most promising cell performance which is attributed to its good physical stability and wettability. Moreover, the cell performance of the PAA binder electrode was further improved by combining the PAA binder with the PVDF binder, which enhances the specific capacity up to 1.3 times higher than that of the PAA binder electrode. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：103 / 109

页数：7

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