A High-Rate and Long-Life Aqueous Rechargeable Mg-Ion Battery Based on an Organic Anode Integrating Diimide and Triazine.
CHEMSUSCHEM 2023;
16:e202202347. [PMID:
36648289 DOI:
10.1002/cssc.202202347]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/14/2023] [Accepted: 01/16/2023] [Indexed: 05/20/2023]
Abstract
Aqueous Mg-ion batteries (MIBs) lack reliable anode materials. This study concerns the design and synthesis of a new anode material - a π-conjugate of 3D-poly(3,4,9,10-perylenetracarboxylic diimide-1,3,5-triazine-2,4,6-triamine) [3D-P(PDI-T)] - for aqueous MIBs. The increased aromatic structure inhibits solubility in aqueous electrolytes, enhancing its structural stability. The 3D-P(PDI-T) anode exhibits several notable characteristics, including an extremely high rate capacity of 358 mAh g-1 at 0.05 A g-1 , A 3D-P(PDI-T)‖Mg2 MnO4 full cell exhibits a reversible capacity of 148 mAh g-1 and a long cycle life of 5000 cycles at 0.5 A g-1 . The charge storage mechanism reveals a synergistic interaction of Mg2+ and H+ cations with C-N/C=O groups. The assembled 3D-P(PDI-T)‖Mg2 MnO4 full cell exhibits a capacity retention of around 95 % after 5000 cycles at 0.5 A g-1 . This 3D-P(PDI-T) anode sustained its framework structure during the charge-discharge cycling of Mg-ion batteries. The reported results provide a strong basis for a cutting-edge molecular engineering technique to afford improved organic materials that facilitate efficient charge-storage behavior of aqueous Mg-ion batteries.
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