Improving the capacity and cycling-stability of Lithium–sulfur batteries using self-healing binders containing dynamic disulfide bonds,Sustainable Energy & Fuels

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Improving the capacity and cycling-stability of Lithium–sulfur batteries using self-healing binders containing dynamic disulfide bonds
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-03-31 , DOI: 10.1039/d0se00309c
Lei Duan _{1,

2,

3,

4,

5} , Weihua Kong _{1,

2,

3,

4,

5} , Wen Yan _{1,

2,

3,

4,

5} , Cheng-Hui Li _{1,

2,

3,

4,

5} , Zhong Jin _{1,

2,

3,

4,

5} , Jing-Lin Zuo _{1,

2,

3,

4,

5}

Affiliation

Lithium–sulfur batteries, which can be applied for portable electronic devices with longer endurance, have received tremendous attention because of their high theoretical capacity and high energy density. However, both electrode volume variation and serious shuttling effects during the charge/discharge process limit the promotion of lithium–sulfur batteries. In this work, a novel self-healing poly(dimethylsiloxane) polymer with dynamic disulfide bonds (2S-PDMS) was designed as a binder for sulfur electrodes. The disulfide bonds in 2S-PDMS molecules can reversibly break and form, facilitating the conversion of polysulfides, as evidenced from both experimental and calculated results. In addition, 2S-PDMS binders with a remarkable self-healing ability and flexibility can keep the sulfur cathode integrated without cracks or damage. Consequently, the 2S-PDMS-based cathode exhibits both high capacity and excellent cycling stability, showing a specific capacity of 545.7 mA h g⁻¹ at 2.0C after 400 cycles (79.6% capacity retention). Moreover, soft-packed Li–S batteries with a high sulfur loading of 6.6 mg cm⁻² deliver a high areal capacity of 4.54 mA h cm⁻² after 50 cycles, which verifies the good flexibility and stability of the 2S-PDMS-based cathode.

中文翻译：

使用包含动态二硫键的自修复粘合剂提高锂硫电池的容量和循环稳定性

锂硫电池由于具有较高的理论容量和较高的能量密度，因此可用于具有更长使用寿命的便携式电子设备，因此受到了极大的关注。但是，在充电/放电过程中电极体积的变化和严重的穿梭效应都限制了锂硫电池的推广。在这项工作中，具有动态二硫键（2S-PDMS）的新型自愈聚（二甲基硅氧烷）聚合物被设计为硫电极的粘合剂。实验和计算结果均表明，2S-PDMS分子中的二硫键可以可逆地断裂和形成，从而促进了多硫化物的转化。此外，具有出色的自修复能力和柔韧性的2S-PDMS粘合剂可保持硫阴极的整体性，而不会产生裂纹或损坏。所以，400个循环后在2.0C时为^-1（79.6％的容量保持率）。此外，高硫含量为6.6 mg cm^-2的软包装Li-S电池在50次循环后可提供4.54 mA h cm^-2的高面容量，这证明了基于2S-PDMS的电池具有良好的柔韧性和稳定性阴极。

更新日期：2020-03-31

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