Enhancing Performances of Polydopamine as Cathode for Lithium‐ and Potassium‐Ion Batteries by Simple Grafting of Sulfonate Groups,Batteries & Supercaps

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Enhancing Performances of Polydopamine as Cathode for Lithium‐ and Potassium‐Ion Batteries by Simple Grafting of Sulfonate Groups
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-10-27 , DOI: 10.1002/batt.202000242
Abdelhafid Aqil ₁ , Christine Jérôme ₁ , Frédéric Boschini ₂ , Abdelfattah Mahmoud ₂

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Polydopamine (PDA) is a bioderived organic electrode material which exhibits a low capacity of ∼100 mAh.g⁻¹ due to the large PDA aggregates formed at the electrode during self‐polymerization of DA. In this work, it found that a simple grafting of sulfonate groups via Michael addition can endow sulfonated PDA with superior electrochemical performances. Benefiting from the homogeneity of the coated active material and the improved ionic conductivity, the optimized PDA delivered high storage capacities of 206 mAh.g⁻¹ for LIBs and 82 mAh.g⁻¹ for KIBs at a high current density of (1000 mA.g⁻¹) with a coulombic efficiency of nearly 100 %.

中文翻译：

通过简单接枝磺酸盐基团提高聚多巴胺作为锂和钾离子电池正极的性能

聚多巴胺（PDA）是一种生物衍生的有机电极材料，由于DA在自聚合过程中在电极上形成了很大的PDA聚集体，因此其容量约为100 mAh.g ^-1。在这项工作中，发现通过迈克尔加成的磺酸基团的简单接枝可以赋予磺化的PDA优异的电化学性能。从涂布的活性材料的均匀性和改善的离子电导率受益，优化的PDA递送206 mAh.g的高存储容量^-1为LIBS和82 mAh.g ^-1处的（千毫安的高电流密度为KIBS。 g ^-1）的库仑效率接近100％。

更新日期：2020-10-27

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