Rational Design of Graphite Nanoplatelets Interlayers via a Surfactant-Controlled Strategy for Enhancing Lithium-Sulfur Batteries

被引:20
作者
Chen, Min [1 ,2 ]
Fu, Xuewei [2 ]
Taylor, Noah David [2 ]
Chen, Zhiping [1 ]
Zhong, Wei-Hong [2 ]
机构
[1] Chongqing Univ, Coll Mat Sci & Engn, 174 Shezhengjie, Chongqing 400044, Peoples R China
[2] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA
关键词
Lithium-sulfur battery; Gelatin protein; Graphite nanoplatelets; Surfactant; Interlayer; HIGH-PERFORMANCE; CATHODE MATERIAL; GRAPHENE; POLYSULFIDES; GELATIN; COMPOSITE; POLYMERS; PROGRESS; DEFECTS;
D O I
10.1021/acssuschemeng.9b02383
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Developing advanced battery interlayers is one of the promising approaches for trapping dissolved polysulfides in lithium-sulfur (Li-S) batteries. Thus far, there is a lack of cost-effective strategies to characterize the comprehensive properties of interlayers and understanding of the roles that the interlayer properties play in the battery performance. Herein, we design a surfactant-controlled strategy to tune the structures/properties of the interlayers and establish the relationships among structure, property, and performance through comprehensive characterizations. It is surprisingly found that only with a specific surfactant, gelatin protein, a robust and self-assembled porous graphite nanoplatelets (GNPs) interlayer can be achieved. Meanwhile, benefiting from the rich functional groups of protein, the protein functionalization of GNPs leads to not only good adhesion to a separator for the GNPs interlayer but also strong polysulfide-trapping ability. As a result, by adding the protein-functionalized GNPs interlayer to a Li-S battery, the electrochemical performance is obviously enhanced, owing to the abilities of the interlayer for trapping polysulfides and facilitating ion transport simultaneously. This study correlates the physicochemical properties of interlayers with their electrochemical performance and is of universal significance for design and fabrication of advanced battery interlayers.
引用
收藏
页码:15267 / 15277
页数:21
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