A Conjugated Coordination Polymer with Benzoquinone as Electrode Material for All Organic Symmetric Lithium‐ion Batteries

• Published in: ChemPlusChem (Weinheim, Germany) Germany), 2024-05, Vol.89 (5), p.e202300620-n/a
• Main Authors: Liang, Chenglu, Cai, Xuesong, Lin, Jinghang, Chen, Yuan, Xie, Yuxing, Liu, Yang
• Format: Article
• Language: English
• Subjects: All organic symmetric lithium-ion batteries; Carbonyl conjugated polymer; Co coordinated polymer; Electrochemistry; organic cathode
• ISSN: 2192-6506; 2192-6506
• DOI: 10.1002/cplu.202300620

Carbonyl rich conjugated polymer electrode materials for lithium‐ion batteries possessed the advantages of strong molecular design ability, abundance and high theoretical capacity. In this work, a Co2+ coordinated conjugated polymer using 2,3,5,6‐tetraamino‐p‐benzoquinone (TABQ) as building block was constructed and developed as electrode material for all organic symmetric lithium‐ion batteries, outputting a specific capacity of over 100 mAh g−1 after 50 cycles at 50 mA g−1. Performances of Co‐TABQ in half cells were explored. The Co‐TABQ cathode delivered a capacity of 133.3 mAh g−1 after 150 cycles at 20 mA g−1. When cycled at higher current density of 500 mA g−1, the capacity gradually increased to 109.4 mAh g−1 after 4000 cycles. The Co‐TABQ anode displayed a stable capacity of 568.6 mAh g−1 at 1 A g−1. The charge transfer within the electrode was greatly reduced due to the metallic centers in the extended conjugated skeleton, and the reversible Li+ storage was achieved by the active C=O and imine groups. This work showed the great potential of metal mediated conjugated polymer in Lithium‐ion batteries. A π‐d conjugated coordination polymer (CCP) Co‐TABQ with C=O was used as electrode material for all organic symmetric lithium‐ion batteries. The Co‐TABQ/Co‐TABQ full battery showed excellent rate performance, with the first discharge capacity of 197.7 mAh g−1 at 50 mA g−1 and the cycle capacity of 102.1 mAh g−1 after 50 cycles.