Preparation of BMIMBr Cement-Based Electrolyte and Its Application in Structural Supercapacitor

Abstract

Abstract: To improve the ionic conductivity and electrochemical performance, a cement-based composite electrolyte with high ionic conductivity and good mechanical strength was synthesized by using room temperature ionic liquid 1-butyl-3-methylimidazole bromide (BMIMBr) as redox active additive, which can be applied to construct structural supercapacitor. The results show that the ionic conductivity of cement-based composite electrolyte containing 20% (mass fraction) BMIMBr reaches the highest value of 35.91 mS·cm^-1. BMIMBr can provide Br^- which can produce reduction reactions and increase the number of free ions, which is beneficial for ion transport in electrolyte and obtains higher specific capacitance. The structural supercapacitor shows a high specific capacitance of 20.07 F·g^-1 at a current density of 0.05 A·g^-1. After 1 000 cycles of galvanostatic charge-discharge, the capacitance retention rate reaches 83.6% and coulomb efficiency is 97.56%, demonstrating an excellent cycle lifespan.

Key words: cement-based electrolyte, supercapacitor, redox, ionic conductivity, specific capacitance, cycle lifespan

CLC Number:

TU528

LI Jiandong, YANG Zhenying, DING Yangfei. Preparation of BMIMBr Cement-Based Electrolyte and Its Application in Structural Supercapacitor[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 509-516.

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