用于高性能锂硫电池的MoS2改性异质结构凝胶聚合物电解质,ACS Applied Materials & Interfaces

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用于高性能锂硫电池的MoS2改性异质结构凝胶聚合物电解质
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-08-09 , DOI: 10.1021/acsami.3c07321
Ziyun Chi ₁ , Jianlong Ding ₁ , Chao Ding ₁ , Bowen Cui ₁ , Wenqiang Wang ₁ , Gengchao Wang ₁

Affiliation

在Li-S电池中，正极侧多硫化物锂（LiPS）的穿梭效应和负极侧锂枝晶的生长是导致循环寿命不足的两个主要问题。本文针对Li-S电池两侧不同化学环境带来的挑战，提出了一种单面电催化还原氧化石墨烯/MoS2涂层的异质结构聚丙烯酸乙酯-离子液体_共聚凝胶电解质(MoS ₂ @rGO-GPE) 的开发是为了组装具有自支撑石墨烯硫阴极的高性能锂硫电池。在这样的器件架构中，存在对穿梭效应的多位置抑制；即石墨烯泡沫的约束、MoS ₂复合物的催化以及凝胶聚合物电解质的捕获。结果表明，异质结构电解质的离子电导率为1.98 mS cm ^–1，Li离子迁移数达到0.81。组装的锂硫电池在0.1 C下表现出1027 mAh g ^–1的高初始放电容量、优异的循环稳定性（500次循环后容量保持率为80%）和优异的倍率性能。该设计策略为高性能锂硫电池的开发提供了一条有价值的路线。

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A Heterostructured Gel Polymer Electrolyte Modified by MoS2 for High-Performance Lithium–Sulfur Batteries

In Li–S batteries, the shuttle effect of polysulfide lithium (LiPS) on the cathode side and the growth of lithium dendrites on the anode side are two major problems that lead to an insufficient cycle life. Herein, in light of the challenges brought on by the different chemical environments on both sides of Li–S batteries, a heterostructured poly(ethyl acrylate-co-ionic liquid) gel electrolyte with a single-sided electrocatalytic reduced graphene oxide/MoS₂ coating (MoS₂@rGO-GPE) was developed in order to assemble a high-performance Li–S battery with a self-supporting graphene sulfur cathode. In such a device architecture, there is multiposition suppression of the shuttle effect; that is, the confinement of the graphene foam, the catalysis of the MoS₂ composite, and the capture of the gel polymer electrolyte. Our results show that the ionic conductivity of the heterostructured electrolyte is 1.98 mS cm^–1, and the Li ion transference number reaches 0.81. The assembled lithium–sulfur battery displays a high initial discharge capacity of 1027 mAh g^–1 at 0.1 C, superior cycle stability (80% capacity retention after 500 cycles), and excellent rate performance. This design strategy provides a valuable route for the development of high-performance lithium–sulfur batteries.

更新日期：2023-08-09

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