Investigation of Complex Electrolyte Decomposition at Large-Scale 18650 Cylindrical Supercapacitor Cells

作     者：Phojaroen, Jiraporn Wuamprakhon, Phatsawit Sangsanit, Thitiphum Santiyuk, Kanruthai Songthan, Ronnachai Tejangkura, Worapol Sawangphruk, Montree 

作者机构： Department of Chemical and Biomolecular Engineering School of Energy Science and Engineering Vidyasirimedhi Institute of Science and Technology Rayong21210 Thailand 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Supercapacitor 

摘      要：This study elucidates the role of acetamide as a pivotal indicator for electrolyte decomposition in acrylonitrile-based supercapacitors, expanding the understanding of degradation mechanisms within these energy storage devices. Acetamide formation, resulting from the hydrolysis of acetonitrile under elevated voltages, serves as a primary marker for electrolyte instability. Further investigations reveal the subsequent transformation of acetamide into N-ethyl acetamide and trimethylsilyl acetamide, highlighting the complex chemical interactions between the electrolyte and electrode materials, as well as the influence of silicon carbide impurities present in commercial activated carbon, which is the state-of-the-art material of practical supercapacitors. These findings underscore the detrimental impact of such decomposition products on supercapacitor performance, notably diminishing electrode porosity and surface area, thereby reducing capacitance and elevating internal resistance. The research emphasizes the critical need for stringent control over electrolyte composition and the purification of electrode materials to mitigate degradation pathways, thereby enhancing the reliability and efficiency of acrylonitrile-based supercapacitors. © 2024, The Authors. All rights reserved.