A donor–acceptor (D–A) conjugated polymer for fast storage of anions

Author:

Fu Manli1,Chen Yuan12,Jin Weihao3,Dai Huichao1,Zhang Guoqun1,Fan Kun12,Gao Yanbo1,Guan Linnan1,Chen Jizhou1,Zhang Chenyang1,Ma Jing3,Wang Chengliang12ORCID

Affiliation:

1. School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics (WNLO) Key Laboratory of Material Chemistry for Energy Conversion and Storage Huazhong University of Science and Technology Wuhan 430074 China

2. Wenzhou Key Laboratory of Optoelectronic Materials and Devices Application Wenzhou Advanced Manufacturing Institute Huazhong University of Science and Technology Wenzhou 325035 China

3. School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

Abstract

AbstractOrganic electrode materials have attracted a lot interest in batteries in recent years. However, most of them still suffer from low performance such as low electrode potential, slow reaction kinetics, and short cycle life. In this work, we report a strategy of fabricating donor–acceptor (D–A) conjugated polymers for facilitating the charge transfer and therefore accelerating the reaction kinetics by using the copolymer (p‐TTPZ) of dihydrophenazine (PZ) and thianthrene (TT) as a proof‐of‐concept. The D–A conjugated polymer as p‐type cathode could store anions and exhibited high discharge voltages (two plateaus at 3.82 V, 3.16 V respectively), a reversible capacity of 152 mAh g−1 at 0.1 A g−1, excellent rate performance with a high capacity of 124.2 mAh g−1 at 10 A g−1 (≈50 C) and remarkable cyclability. The performance, especially the rate capability was much higher than that of its counterpart homopolymers without D–A structure. As a result, the p‐TTPZ//graphite full cells showed a high output voltage (3.26 V), a discharge specific capacity of 139.1 mAh g−1 at 0.05 A g−1 and excellent rate performance. This work provides a novel strategy for developing high performance organic electrode materials through molecular design and will pave a way towards high energy density organic batteries.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry,Catalysis

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