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A quinoxalinophenazinedione covalent triazine framework for boosted high-performance aqueous zinc-ion batteries
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2022-06-08 , DOI: 10.1039/d2ta03655j Weihua Tang , Yiyun Wang , Xinlei Wang , Jian Tang
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2022-06-08 , DOI: 10.1039/d2ta03655j Weihua Tang , Yiyun Wang , Xinlei Wang , Jian Tang
Featuring low cost, safety and environmental friendliness, aqueous zinc-ion batteries (AZIBs) have emerged as a promising grid-scale energy storage solution; however, they are facing challenges especially because of their moderate capacity and short cycling life. We herein develop a quinoxalinophenazinedione covalent triazine framework (CTF-TTPQ) knotted by triazine nodes as an organic cathode to boost the energy storage capacity and cycle stability of AZIBs. Experimental and ex situ characterization studies together with DFT calculations reveal the H+/Zn2+ co-insertion mechanism and the simultaneous bonding of Zn2+ with high-density carbonyl and imine redox active sites. TTPQ exhibits superior electrochemical performance to most reported organic cathodes for AZIBs. Benefiting from the multiple electroactive CO and CN redox sites for ion intercalation/deintercalation, TTPQ exhibits high energy density (404 mA h g−1 × 1.07 V = 432.28 W h kg−1) and excellent cycling stability (>94% capacity retention after 250 cycles at 0.5 A g−1). The understanding on structure design of redox polymer cathodes and the ion intercalation mechanism for excellent electrochemical performance provided by this study will surely promote the new development of AZIBs for practical applications.
中文翻译:
用于增强型高性能水系锌离子电池的喹喔啉代吩嗪二酮共价三嗪骨架
水系锌离子电池(AZIBs)具有低成本、安全和环保的特点,已成为一种有前途的电网规模储能解决方案;然而,它们面临着挑战,特别是因为它们的容量适中且循环寿命短。我们在此开发了一种由三嗪节点打结的喹喔啉代吩嗪二酮共价三嗪骨架 (CTF-TTPQ) 作为有机正极,以提高 AZIBs 的储能容量和循环稳定性。实验和异位表征研究以及 DFT 计算揭示了 H + /Zn 2+共插入机制和 Zn 2+的同时键合具有高密度羰基和亚胺氧化还原活性位点。与大多数报道的 AZIB 有机正极相比,TTPQ 表现出优异的电化学性能。得益于用于离子嵌入/脱嵌的多个电活性CO 和 C N 氧化还原位点,TTPQ 表现出高能量密度(404 mA hg -1 × 1.07 V = 432.28 W h kg -1)和出色的循环稳定性(>94% 容量保持率)在 0.5 A g -1下 250 次循环后)。本研究对氧化还原聚合物正极的结构设计和优异电化学性能的离子嵌入机理的理解必将推动AZIBs在实际应用中的新发展。
更新日期:2022-06-08
中文翻译:
用于增强型高性能水系锌离子电池的喹喔啉代吩嗪二酮共价三嗪骨架
水系锌离子电池(AZIBs)具有低成本、安全和环保的特点,已成为一种有前途的电网规模储能解决方案;然而,它们面临着挑战,特别是因为它们的容量适中且循环寿命短。我们在此开发了一种由三嗪节点打结的喹喔啉代吩嗪二酮共价三嗪骨架 (CTF-TTPQ) 作为有机正极,以提高 AZIBs 的储能容量和循环稳定性。实验和异位表征研究以及 DFT 计算揭示了 H + /Zn 2+共插入机制和 Zn 2+的同时键合具有高密度羰基和亚胺氧化还原活性位点。与大多数报道的 AZIB 有机正极相比,TTPQ 表现出优异的电化学性能。得益于用于离子嵌入/脱嵌的多个电活性CO 和 C N 氧化还原位点,TTPQ 表现出高能量密度(404 mA hg -1 × 1.07 V = 432.28 W h kg -1)和出色的循环稳定性(>94% 容量保持率)在 0.5 A g -1下 250 次循环后)。本研究对氧化还原聚合物正极的结构设计和优异电化学性能的离子嵌入机理的理解必将推动AZIBs在实际应用中的新发展。