High-Performance Self-Healing Polyurethane Binder Based on Aromatic Disulfide Bonds and Hydrogen Bonds for the Sulfur Cathode of Lithium–Sulfur Batteries,Industrial & Engineering Chemistry Research

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High-Performance Self-Healing Polyurethane Binder Based on Aromatic Disulfide Bonds and Hydrogen Bonds for the Sulfur Cathode of Lithium–Sulfur Batteries
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-08-04 , DOI: 10.1021/acs.iecr.1c02103
Xiang Zhang ₁ , Peng Chen _{1,

2} , Ying Zhao ₁ , Mingliang Liu ₁ , Zhenggang Xiao ₁

Affiliation

Lithium–sulfur (Li–S) batteries have been the focus of new energy due to their excellent energy density, but the large volume changes in sulfur cathodes and the shuttle of polysulfides seriously hinder their further development. Therefore, solving both the abovementioned problems is the key to the widespread applications of Li–S batteries. Here, a smart self-healing polyurethane binder (PUB) with sulfur fixation ability is successfully developed for sulfur cathodes. In this design, aromatic disulfide bonds are introduced into the PUB matrix and cooperated with hydrogen bonds in the matrix to provide the self-healing property. The PUB can ensure the sulfur cathode an integrated physical structure by autonomously healing the microcracks caused by volume changes. The sulfur-fixing groups in the PUB can effectively absorb the polysulfides in the electrochemical reaction to suppress the shuttling effect. As a result, the Li–S batteries exhibit a high electrochemical capacity of 1269.7 mA h g^–1 and a small fading rate of 0.04% per cycle at 2 C for 500 cycles. Hence, the PUB with dual functions of self-repair and sulfur fixation can effectively stabilize the electrode structures of Li–S batteries and guarantee their electrochemical performance.

中文翻译：

基于芳族二硫键和氢键的高性能自修复聚氨酯粘合剂，用于锂硫电池的硫正极

锂硫（Li-S）电池由于其优异的能量密度一直是新能源的关注焦点，但硫正极体积变化大和多硫化物穿梭严重阻碍了其进一步发展。因此，解决上述两个问题是锂硫电池广泛应用的关键。在这里，成功地开发了一种用于硫正极的具有固硫能力的智能自修复聚氨酯粘合剂（PUB）。在这个设计中，芳香族二硫键被引入到PUB基体中，并与基体中的氢键协同作用以提供自修复特性。PUB 可以通过自主修复体积变化引起的微裂纹，确保硫阴极具有完整的物理结构。PUB中的固硫基团可以有效吸收电化学反应中的多硫化物，抑制穿梭效应。结果，Li-S电池表现出1269.7 mA hg的高电化学容量^–1和 0.04% 的小褪色率，在 2 C 下 500 次循环。因此，具有自修复和固硫双重功能的PUB可以有效稳定Li-S电池的电极结构并保证其电化学性能。

更新日期：2021-08-19

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