具有增强的韧性和弹性的耐用聚合物在柔性锂离子电池中的应用研究,ACS Applied Energy Materials

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具有增强的韧性和弹性的耐用聚合物在柔性锂离子电池中的应用研究
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-08 , DOI: 10.1021/acsaem.0c02442
Craig A. Jenkins ₁ , Stuart R. Coles ₁ , Melanie. J. Loveridge ₁

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下一代可穿戴设备推动了锂离子电池（LIB）的开发，该锂离子电池可提供机械灵活性，同时保持安全稳定的能源。在常规电池设计中，电极涂层在暴露于循环弯曲时易于破裂和崩解。这导致容量损失，电阻增加，并严重限制了它们的循环寿命。聚氨酯（PU）已作为电池粘合剂进行了研究，但尚未研究可用的各种化学方法以及它们如何影响性能。这项研究调查了三种不同的PU化学，每种化学都由不同的多元醇主链组成-聚酯，聚醚和聚己内酯。这些与工业上最常用的刚性粘合剂PVDF进行了比较。电化学和机械表征的结合确定了PU粘结剂化学的重要性，特别是当考虑到粘结剂与电解质的相互作用时。当放置在电解质中时，聚酯和聚己内酯PU的化学性质均显着膨胀，从而损害了它们的导电网络和机械优势。相反，发现聚醚PU是适用于柔性电池的粘合剂，因为它具有很强的粘合力，即使在电解质中溶胀后仍能保持其性能。这些发现提出了有希望的聚合物选择，以促进用于柔性能量存储系统的高级和耐用电极的开发。当放置在电解质中时，聚酯和聚己内酯PU的化学性质均显着膨胀，从而损害了它们的导电网络和机械优势。相反，发现聚醚PU是适用于柔性电池的粘合剂，因为它具有很强的粘合力，即使在电解质中溶胀后仍能保持其性能。这些发现提出了有希望的聚合物选择，以促进用于柔性能量存储系统的高级和耐用电极的开发。当放置在电解质中时，聚酯和聚己内酯PU的化学性质均显着膨胀，从而损害了它们的导电网络和机械优势。相反，发现聚醚PU是合适的用于柔性电池的粘合剂，因为它具有很强的粘合力，甚至在电解质中溶胀后仍能保持其性能。这些发现提出了有希望的聚合物选择，以促进用于柔性能量存储系统的高级和耐用电极的开发。

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Investigation into Durable Polymers with Enhanced Toughness and Elasticity for Application in Flexible Li-Ion Batteries

Next-generation wearable devices compel the development of lithium-ion batteries (LIBs) that can afford mechanical flexibility while remaining safe and stable energy sources. In conventional battery designs the electrode coatings are susceptible to fracture and disintegration when exposed to cyclic flexure. This results in capacity loss, resistance increases, and severely limits their cycle life. Polyurethane (PU) has been investigated as a battery binder but without research into the variety of chemistries available, and how they affect performance. This research investigates three different PU chemistries, each composed of a different polyol backbone–polyester, polyether and polycaprolactone. These are compared with PVDF, the most commonly used rigid binder in industry. The combination of electrochemical and mechanical characterization identified the importance of PU binder chemistry, particularly when the binder’s interaction with the electrolyte was considered. Both the polyester and polycaprolactone PU chemistries swelled significantly when placed in an electrolyte, compromising their conductive networks and mechanical advantages. In contrast, polyether PU was found to be a suitable binder for flexible batteries as it has strong adhesion and retains its properties even after swelling in the electrolyte. These findings present a promising polymer choice to facilitate the development of advanced and durable electrodes for flexible energy storage systems.

更新日期：2020-12-28

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