Ni/SiO2/Graphene-modified separator as a multifunctional polysulfide barrier for advanced lithium-sulfur batteries

被引：117

作者：

Chen, Chao ^{[1
]}

Jiang, Qingbin ^{[1
]}

Xu, Huifang ^{[1
]}

Zhang, Yaping ^{[2
]}

Zhang, Bingkai ^{[1
]}

Zhang, Zhenyu ^{[1
]}

Lin, Zhan ^{[1
]}

Zhang, Shanqing ^{[3
]}

机构：

[1] Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou Key Lab Clean Transportat Energy Chem, Guangzhou 510006, Peoples R China

[2] Southwest Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Environm Friendly Energy Mat, Mianyang 621010, Sichuan, Peoples R China

[3] Griffith Univ, Ctr Clean Environm & Energy, Sch Environm & Sci, Gold Coast Campus, Southport, Qld 4222, Australia

来源：

NANO ENERGY | 2020年 / 76卷

基金：

中国国家自然科学基金;

关键词：

Lithium-sulfur battery; Function separator; Polysulfide; Silica; Nickel; GENERALIZED GRADIENT APPROXIMATION; RATIONAL DESIGN; POROUS CARBON; ENERGY; PERFORMANCE; DIFFUSION; HETEROSTRUCTURES; INTERLAYER; CONVERSION; DENSITY;

D O I：

10.1016/j.nanoen.2020.105033

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：

Lithium-sulfur batteries with high energy density and low cost are widely recognized as one of the most promising next generation energy storage devices. However, their practical applications are hampered by the notorious polysulfide shuttle effect, which leads to a series of problems including the loss of active materials and poor cycling efficiency. We herein develop a Ni nanoparticles embedded in silica (Ni/SiO2) nanosheet spheres, which are mixed with graphene, and then coated on the separator as a highly effective lithium polysulfides (LiPSs) blocking layer. The Ni/SiO2/Graphene-modified separator is able to anchor LiPSs through affinity towards LiPSs by silica and Ni atoms, and enable rapid conversion between LiPSs and Li2S2/Li2S by abundant Ni catalytic sites. The mesoporous hollow structure of the Ni/SiO2 nanosheet spheres also facilitates Li thorn diffusion. As a result, Li-S batteries with the Ni/SiO2/Graphene-modified separator achieve a stable cycling performance (specific capacity of 922 mAh g(-1) after 100 cycles, with the cyclic decay rate of 0.28%), coulombic efficiency of approximately 100%, and a high rate capability (782 mAh g(-1) at 2 C). Our work provides an effective strategy to build a multifunctional separator for highly stable Li-S batteries.

引用

页数：8

共 48 条

[1] Modified Separator Performing Dual Physical/Chemical Roles to Inhibit Polysulfide Shuttle Resulting in Ultrastable Li-S Batteries [J].