Inhibiting the shuttle effect using artificial membranes with high lithium-ion content for enhancing the stability of the lithium anode,Journal of Materials Chemistry A

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Inhibiting the shuttle effect using artificial membranes with high lithium-ion content for enhancing the stability of the lithium anode
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-25 , DOI: 10.1039/c9ta13304f
Dong Liang _{1,

2,

3,

4,

5} , Tengfei Bian _{1,

2,

3,

4,

5} , Qing Han _{1,

2,

3,

4,

5} , Hua Wang _{1,

2,

3,

4,

5} , Xiaosheng Song _{1,

2,

3,

4,

5} , Binbin Hu _{1,

2,

3,

4,

5} , Jinling He _{1,

2,

3,

4,

5} , Yong Zhao _{1,

2,

3,

4,

5}

Affiliation

The low cycle stability of the lithium anode has become one of the bottlenecks restricting the development of lithium-metal batteries with high theoretical energy density. Serious side reactions between lithium and electrolyte components are one of the key reasons for the poor cycle stability of the lithium anode. Herein, lithiated graphene oxide (GO-Li) and lithium poly(styrene sulfate) (PSS-Li) are used to construct composite membranes for the protection of the Li-anode, which shows long-term operation over 1000 h in Li‖Li symmetric cells in the presence of redox chemicals that accelerate the cathodic reaction. The high content of Li⁺ of PSS-Li can not only inhibit the dissolution and diffusion of redox molecules in the membrane, but also improve the Li⁺ transport rate through the membrane. In our study, we take a lithium–oxygen (Li–O₂) battery as the model device and 2,2,6,6-tetramethyl-1-piperidinyloxy as the model redox chemical to accelerate the cathodic reaction. Compared with conventional membranes, artificial membranes can effectively inhibit the side reaction between the redox molecules and the lithium anode. Consequently, the energy efficiency and cycle stability (over three times) of Li–O₂ batteries are greatly improved. This provides an important theoretical basis and technical support for the design and preparation of membranes for high performance energy-conversion batteries.

中文翻译：

使用锂离子含量高的人造膜抑制穿梭效应，以增强锂阳极的稳定性

锂阳极的低循环稳定性已成为制约发展具有高理论能量密度的锂金属电池的瓶颈之一。锂和电解质组分之间的严重副反应是锂阳极循环稳定性差的关键原因之一。本文中，使用锂化氧化石墨烯（GO-Li）和聚苯乙烯硫酸锂（PSS-Li）来构建复合膜以保护锂阳极，该膜在Li‖Li中可长期运行1000 h以上。氧化还原化学物质存在的情况下，对称细胞会加速阴极反应。PSS-Li中Li ⁺含量高，不仅可以抑制氧化还原分子在膜中的溶解和扩散，而且可以改善Li ⁺通过膜的转运速率。在我们的研究中，我们以锂-氧（Li-O ₂）电池为模型设备，以2,2,6,6-四甲基-1-哌啶基氧基为模型氧化还原化学物质来加速阴极反应。与常规膜相比，人造膜可以有效抑制氧化还原分子与锂阳极之间的副反应。因此，Li-O ₂电池的能量效率和循环稳定性（超过三倍）得到了极大的提高。这为高性能能量转换电池膜的设计和制备提供了重要的理论基础和技术支持。

更新日期：2020-07-21

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