Rationally designing composite gel polymer electrolyte enables high sulfur utilization and stable lithium anode
Rationally designing composite gel polymer electrolyte enables high sulfur utilization and stable lithium anode
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DOI：
10.1016/j.cej.2022.138195
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发表时间：
2022-07
影响因子：
15.1
通讯作者：
Pengfei Xie;Ruyi Yang;Yingke Zhou;Bingyin Zhang;Xiaohui Tian
中科院分区：
文献类型：
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作者：
Pengfei Xie;Ruyi Yang;Yingke Zhou;Bingyin Zhang;Xiaohui Tian
锂硫电池是一种低成本、高能量密度的储能装置。但是，“穿梭效应”、锂枝晶生长和安全问题仍然制约着其发展。本文设计了一种新型PEO-PAN-LLZO复合凝胶聚合物电解质（CGPE）来克服这些问题。将PAN、PEO、LLZO片料经流延分散后形成具有优异力学性能和界面性能的多孔复合膜，该复合膜能有效吸收电解质，抑制“穿梭效应”，保护锂离子电池负极。导电乙炔黑层涂覆在膜上，以进一步阻碍迁移和提高多硫化物的氧化还原动力学。CGPE基锂硫电池显示出非常高的比容量（0.1和1C下分别为1459和942 mAh/g）和优异的循环性能（1C下500次循环后555 mAh/g，平均衰减/循环为0.082%）。这种独特的CGPE为高性能锂硫电池的实际应用奠定了基础。
The lithium-sulfur battery is an attractive energy-storage device with low cost and high energy density. However, its development is still restricted by “shuttle effect”, lithium dendrite growth and safety problem. Herein, a novel PEO-PAN-LLZO composite gel polymer electrolyte (CGPE) was designed to overcome these issues. A porous composite membrane with excellent mechanical and interfacial properties was formed after casting dispersion of PAN, PEO, LLZO sheets, which can effectively absorb electrolyte, inhibit “shuttle effect” and protect lithium anode. A conductive acetylene black layer was coated on the membrane to further hinder the migration and enhance the redox kinetics of polysulfides. The CGPE based lithium-sulfur battery displays remarkably high specific capacities (1459 and 942 mAh/g at 0.1 and 1C respectively) and outstanding cycling performance (555 mAh/g at 1C after 500 cycles, average decay/cycle of 0.082%). The unique CGPE is promising for the practical application of high-performance lithium-sulfur battery.