Janus Dione-Based Conjugated Covalent Organic Frameworks with High Conductivity as Superior Cathode Materials

Xiaoyi Xu; Shuoqing Zhang; Kai Xu; Hongzheng Chen; Xiulin Fan; Ning Huang

doi:10.1021/jacs.2c10509

Janus Dione-Based Conjugated Covalent Organic Frameworks with High Conductivity as Superior Cathode Materials

J Am Chem Soc. 2023 Jan 18;145(2):1022-1030. doi: 10.1021/jacs.2c10509. Epub 2022 Dec 30.

Authors

Xiaoyi Xu¹, Shuoqing Zhang², Kai Xu¹, Hongzheng Chen¹, Xiulin Fan², Ning Huang¹

Affiliations

¹ MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon Materials, International Research Centre for X Polymers, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
² State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.

PMID: 36584327
DOI: 10.1021/jacs.2c10509

Abstract

The development of conductive covalent organic frameworks (COFs) with high stability is desirable for the practical applications in optoelectronics and energy storage. Herein, we developed a new kind of Janus dione-based COF, which is fully sp² carbon-conjugated through the connection by olefin units. The electrical conductivity and carrier mobility reached up to 10^-3 S cm^-1 and 7.8 cm² V^-1 s^-1, respectively. In addition, these COFs are strongly robust against various harsh conditions. The well-ordered two-dimensional crystalline structures, excellent porosity, high conductivity, and abundant redox-active carbonyl units render these COFs serviceable as high-performance cathode materials in lithium-ion batteries. It is worth noting that TFPPy-ICTO-COF exhibits a capacity of up to 338 mAh g^-1 at a discharge rate of 0.1 C, which sets a new capacity record among COF-based lithium-ion batteries. Its capacity retention was as high as 100% even after 1000 cycles, demonstrating the remarkable stability of these Janus dione-based COF materials. This work not only expands the diversity of olefin-linked COFs but also makes a new breakthrough in energy storage.