Affiliation:
1. National & Local United Engineering Laboratory for Power Battery Department of Chemistry Northeast Normal University Changchun Jilin 130024 China
2. State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
3. Institute of Quantum and Sustainable Technology School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang China
4. School of Applied Chemistry and Engineering University of Science and Technology of China Hefei 230026 China
Abstract
AbstractOrganic materials have attracted much attention in aqueous zinc‐ion batteries (AZIBs) due to their sustainability and structure‐designable, but their further development is hindered by the high solubility, poor conductivity, and low utilization of active groups, resulting in poor cycling stability, terrible rate capability, and low capacity. In order to solve these three major obstacles, a novel organic host, benzo[b]naphtho[2’,3’:5,6][1,4]dithiino[2,3‐i]thianthrene‐5,7,9,14,16,18‐hexone (BNDTH), with abundant electroactive groups and stable extended π‐conjugated structure is synthesized and composited with reduced graphene oxide (RGO) through a solvent exchange composition method to act as the cathode material for AZIBs. The well‐designed BNDTH/RGO composite exhibits a high capacity of 296 mAh g−1 (nearly a full utilization of the active groups), superior rate capability of 120 mAh g−1, and a long lifetime of 58 000 cycles with a capacity retention of 65% at 10 A g−1. Such excellent performance can be attributed to the ingenious structural design of the active molecule, as well as the unique solvent exchange composition strategy that enables effective dispersion of excess charge on the active molecule during discharge/charge process. This work provides important insights for the rational design of organic cathode materials and has significant guidance for realizing ideal high performance in AZIBs.
Funder
National Natural Science Foundation of China
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
44 articles.
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