1. Flexible polyimides through one-pot synthesis as water-soluble binders for silicon anodes in lithium ion batteries.
- Author
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Yao, Dahua, Yang, Yu, Deng, Yonghong, and Wang, Chaoyang
- Subjects
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POLYMERIZATION , *LITHIUM-ion batteries , *POLYIMIDES , *POLYETHYLENE glycol , *SILICON , *BINDING agents , *ESTERIFICATION , *FOURIER transform infrared spectroscopy - Abstract
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 ). [ABSTRACT FROM AUTHOR]
- Published
- 2018
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