One‐Pot Synthesis of a Copolymer Micelle Crosslinked Binder with Multiple Lithium‐Ion Diffusion Pathways for Lithium–Sulfur Batteries,ChemSusChem

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One‐Pot Synthesis of a Copolymer Micelle Crosslinked Binder with Multiple Lithium‐Ion Diffusion Pathways for Lithium–Sulfur Batteries
ChemSusChem ( IF 7.5 ) Pub Date : 2020-01-21 , DOI: 10.1002/cssc.201902772
Rongnan Guo ₁ , Shunlong Zhang ₁ , Jianli Wang ₁ , Hangjun Ying ₁ , Weiqiang Han ₁

Affiliation

Fast lithium‐ion diffusion is very important to obtain high capacity and excellent cycling stability of lithium–sulfur batteries. In this study, a copolymer micelle crosslinked binder (FNA) for lithium–sulfur batteries was successfully synthesized through a one‐pot environmentally friendly approach. The micelles were used as crosslinkers and carriers for the electrolyte. The FNA binder provided multiple lithium‐ion diffusion pathways to increase the lithium‐ion diffusion, which reduced the polarization of the sulfur cathode during the cycling process. The lithium‐ion diffusion pathways of the FNA were provided by the electrolyte hosted in the micelles, the polyethylene oxide and polypropylene oxide segments, and the carboxylate and sulfonate groups in the FNA. In addition, FNA possesses strong lithium polysulfides adsorption and high adhesion properties. Therefore, the electrode with the FNA binder presented a reversible capacity of 571 mAh g⁻¹ with a capacity fade of 0.032 % after 1000 cycles at a cycling rate of 0.5 C, which is much higher than those of the polyvinylidene fluoride (PVDF) sulfur cathode.

中文翻译：

一锅法合成具有多个锂离子扩散途径的锂聚合物电池胶束交联胶束

快速锂离子扩散对于获得锂硫电池的高容量和出色的循环稳定性非常重要。在这项研究中，通过单罐环保方法成功合成了用于锂硫电池的共聚物胶束交联粘合剂（FNA）。胶束用作电解质的交联剂和载体。FNA粘合剂提供了多个锂离子扩散途径，以增加锂离子扩散，从而减少了循环过程中硫阴极的极化。FNA的锂离子扩散途径由胶束中的电解质，聚环氧乙烷和聚环氧丙烷链段以及FNA中的羧酸根和磺酸根提供。此外，FNA具有很强的多硫化锂吸附能力和高粘附性。因此，带有FNA粘合剂的电极的可逆容量为571 mAh g^-1在0.5 C的循环速率下经过1000次循环后的容量衰减为0.032％，这远高于聚偏二氟乙烯（PVDF）硫阴极的容量。

更新日期：2020-01-22

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