Polysulfide-containing Glyme-based Electrolytes for Lithium Sulfur Battery

被引:110
作者
Agostini, Marco [1 ]
Xiong, Shizhao [2 ,3 ]
Matic, Aleksandar [2 ]
Hassoun, Jusef [1 ]
机构
[1] Univ Roma La Sapienza, Dept Chem, I-00185 Rome, Italy
[2] Chalmers, Dept Appl Phys, S-41296 Gothenburg, Sweden
[3] Natl Univ Def Technol, Dept Mat Sci & Engn, Coll Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China
关键词
LI-S BATTERIES; LIQUID ELECTROLYTE; PERFORMANCE; MECHANISM; INTERPHASE; MEMBRANE;
D O I
10.1021/acs.chemmater.5b00896
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A new comparative investigation of lithium sulfur cells employing a tetraethylene glycol dimethyl ether-lithium trifluoromethanesulfonate (TEGDME-LiCF3SO3) electrolyte charged by various polysulfide species (Li2S2, Li2S4, Li2S6, and Li2S8) is here reported. We carefully detect the effects of lithium polysulfide addition by originally combining X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The measurements clearly reveal how the polysulfide addition affects the nature and composition of the solid electrolyte interphase (SEI) in terms of precipitated S-based species determined by XPS. The study demonstrates that the SET layer formed on the Li anode decreases in impedance and stabilizes by the presence of polysulfide. This, together with a buffer effect strongly mitigating the sulfur-cathode dissolution and the shuttle reaction, significantly improves the stability of the lithium-sulfur cell. The data here reported clearly suggest the polytulfide as an effective additive to enhance the performance of the lithium-sulfur battery.
引用
收藏
页码:4604 / 4611
页数:8
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