Surface controlled pseudo-capacitive reactions enabling ultra-fast charging and long-life organic lithium ion batteries

Kamran Amin, Jianqi Zhang, Hang Zhou, Ruichiao Lu, Miao Zhang, Nawal Ashraf, Cheng YueLi, Lijuan Mao, Charl F J Faul, Zhixiang Wei*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

Abstract

To develop ultra-fast charging and long-life lithium ion batteries, a surface-controlled pseudo-capacitive reaction mechanism for high-performance organic lithium ion batteries is developed based on a coaxial nanocomposite of active anthraquinone-based Covalent Organic Framework (AQ-COF) and carbon nanotubes. AQ-COF was grown on the surface of carbon nanotubes (AQ-COF@CNTs) through an in-situ polymerization to improve the conductivity and to facilitate the electrochemical properties. AQ-COF grown on CNTs exhibited excellent rate performance and was found to retain 76% of its initial capacity at current density of 5,000 mAg-1 (33C), and even retained 48% at ultra-high current density of 10,000 mAg-1 (66.7 C). Furthermore, under long term cyclic performance investigations, the AQ-COF@CNTs based cathode retained 100 % of its initial capacity even after 3000 charge–discharge cycles. We further evaluated the charge storage mechanism and found that pseudocapacitance arising from surface-controlled redox reactions, coupled with excellent charge-transfer properties owing to the conductive CNTs network and facilitated by large surface area of active material, is mainly responsible for this excellent rate and cyclic performance .
Original languageEnglish
Pages (from-to)4179-4185
Number of pages7
JournalSustainable Energy and Fuels
Volume4
DOIs
Publication statusPublished - 27 May 2020

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