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首页> 外文期刊>Journal of power sources >Flexible polyimides through one-pot synthesis as water-soluble binders for silicon anodes in lithium ion batteries
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Flexible polyimides through one-pot synthesis as water-soluble binders for silicon anodes in lithium ion batteries

机译：通过一锅法合成的柔性聚酰亚胺，作为锂离子电池中硅阳极的水溶性粘合剂

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摘要

A series of polyimides, which contain polyethylene glycol (PEG) segments with different molecular weight in the polymer chains, are synthesized through a facile one-pot method and characterized by Fourier transform infrared spectroscopy and hydrogen nuclear magnetic resonance spectroscopy. The main part of polyimides is originated from trimellitic anhydride chloride (TMAC) and 4,4'-methylenedianiline, onto which PEG segments are introduced through an esterification reaction with TMAC. These obtained polyimides, which acquire excellent water solubility after being neutralized by triethylamine, are applied as water-soluble binders to silicon negative electrodes for lithium ion batteries, and significantly improve the electrochemical performance of silicon anodes. Specially, the PI-200 (polyimide copolymerized with PEG-200) based silicon electrode exhibits a high initial discharge capacity of 2989.7 mAh g(-1) and remains about 2235.5 mAh g(-1) after 200 cycles at the current density of 0.1 C (420 mA g(-1)).
机译：通过一种简便的一锅法合成了一系列聚酰亚胺，这些聚酰亚胺在聚合物链中包含分子量不同的聚乙二醇（PEG）链段，并通过傅里叶变换红外光谱和氢核磁共振光谱进行了表征。聚酰亚胺的主要部分来自偏苯三甲酰氯（TMAC）和4,4'-亚甲基二苯胺，通过与TMAC的酯化反应在其上引入PEG片段。这些获得的聚酰亚胺在被三乙胺中和后具有优异的水溶性，将其作为水溶性粘合剂应用于锂离子电池的硅负极，并显着改善了硅阳极的电化学性能。特别地，基于PI-200（与PEG-200共聚的聚酰亚胺）的硅电极表现出2989.7 mAh g（-1）的高初始放电容量，并在200次循环后以0.1的电流密度保持约2235.5 mAh g（-1）。 C（420 mA g（-1））。

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