Conjugated and Non‐conjugated Polymers Containing Two‐Electron Redox Dihydrophenazines for Lithium‐Organic Batteries. Issue 9 (18th January 2023)

• Record Type: Journal Article
• Authors: Zhao, Xiang; Qiu, Xuan; Xue, Haodong; Liu, Si; Liang, Dingli; Yan, Chuan; Chen, Weinan; Wang, Yonggang; Zhou, Gang
• Is Part Of: Angewandte Chemie international edition. Volume 62:Issue 9(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-18
• Subjects: Conjugated Polymer -- Dihydrophenazine -- Electrochemistry -- Lithium-Organic Batteries -- Two-Electron Redox; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202216713
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Organic p ‐type cathode materials have recently attracted increasing attention due to their higher redox potentials and rate capabilities in comparison to n ‐type cathodes. However, most of the p ‐type cathodes based on one‐electron redox still suffer from limited stability and low specific capacity (<150 mAh g −1 ). Herein, two polymers, conjugated poly(diethyldihydrophenazine vinylene) (CPP ) and non‐conjugated poly(diethyldihydrophenazine ethylidene) (NCPP ) containing two‐electron redox dihydrophenazine, have been developed as p ‐type cathode materials. It is experimentally and theoretically found that the conjugated linkage among the redox centers in polymer CPP is more favorable for the effective charge delocalization on the conjugated polymer backbone and the sufficient oxidation in the higher potential region (3.3–4.2 V vs. Li/Li + ). Consequently, the CPP cathode displays a higher reversible specific capacity of 184 mAh g −1 with excellent cycling stability. Abstract : Two p ‐type redox polymers, conjugated poly(diethyldihydrophenazine vinylene) (CPP ) and non‐conjugated poly(diethyldihydrophenazine ethylidene) (NCPP ), have been polymerized from an identical monomer. Compared with NCPP, the conjugated linkage among the two‐electron redox centers in CPP is more favorable for the effective charge delocalization on the conjugated polymer backbone and the sufficient oxidation in the higher potential range.