Organic Compound as a Cathode for Aqueous Zinc-Ion Batteries with Improved Electrochemical Performance via Multiple Active Centers

Abstract

Aqueous zinc-ion batteries (AZIBs) are deemed as an emerging substitute for secondary batteries. The type of cathode material has enormous implications for the performance of AZIBs. Organics can act as a suitable cathode for AZIBs because of their green, adjustable structure and good stability. However, developing promising organics with high performance is still an important challenge. Here, an organic material 8,21-dihydronaphtho[2,3-a]naphtha[2′,3′:7,8]quinoxalino[2,3-i]phenazine-5,11,16,22-tetraone (DADB) was synthesized and explored as a cathode for AZIBs. Benefiting from the affluent active sites and the expanded conjugated structure, the DADB electrode rendered splendid rate capability (71 mA h g–1 under 5 A g–1) and outstanding cycle lifespan (87% retention over 6000 cycles under 10 A g–1). Moreover, ex situ characterizations proved that CN and CO bonds were the electrochemical redox centers for storage of Zn2+. Additionally, the DADB electrode also exhibited excellent electrochemical performance in a gel electrolyte (134 mA h g–1 under 0.05 A g–1). This research offered a mentality for designing high-performance organic cathodes of AZIBs.

Ultralong-Life Quinone-Based Porous Organic Polymer Cathode for High-Performance Aqueous Zinc-Ion Batteries

“…(e) Electrochemical performance (cycle number and capacity retention) comparison of the rPOP with previously reported organic cathodes for aqueous ZIBs. The inset shows the comparison plot of the energy density of rPOP at 0.1 A g –1 [HAQ-COF, TABQ, COF-TMT-BT, BT-PTO-COF, PANI, PPPA-COF, PTA-026, PAF-205/CNT, DADB, PDA].…”

“…The dissolution of the rPOP electrode was tested by immersing the pristine, the discharged (0.1 V), and the charged (1.6 V) electrodes in 1 M ZnSO 4 electrolyte for 36 h. As depicted in Figure S15, the rPOP remained insoluble in the electrolyte even in a completely discharged state (0.1 V). rPOP 60 TABQ, 22 COF-TMT-BT, 63 BT-PTO-COF, 58 PANI, 64 PPPA-COF, 61 PTA-026, 65 PAF-205/CNT, 66 DADB, 67 cathodes have high electrochemical stability in rechargeable aqueous batteries.…”

Effect of the Thickness and Sb–O Content in Sb2S3 Thin Films to the Solar Cell Efficiency

“…The 40 nm‐thick CdS thin films were prepared according to our previous reports. [ 15 ] The spiro‐OMeTAD and spiro‐OMeTAD:TMT‐TTF hole‐transport layer, Au electrode, and the measurements of SEM, XPS, EDS, UV–vis, EIS, SCLC, IPCE spectra and the photovoltaic performance were same as our previous reports. [ 12,16,17 ]…”

Vanadium Oxide Cathode Coinserted by Ni2+ and NH4+ for High-Performance Aqueous Zinc-Ion Batteries

“…To date, the most studied cathode materials include manganese-based compounds, − Prussian blue and its analogs, − as well as some organic compounds. , However, the development of these materials has been hindered by various challenges. For instance, manganese-based compounds suffer from the irreversible phase transition and/or dissolution issue; Prussian blue has a limited capacity and the related organic compounds face the problem of dissolution of discharge products. − In the meantime, vanadium-based materials, such as vanadium oxides and vanadates have recently gained intensive attention due to their high theoretical capacities and low cost . Thereinto, hydrated vanadium pentoxide (V 2 O 5 ·nH 2 O) stands out as it has more active sites and tolerance to the insertion/extraction of Zn 2+ owing to the unique layered structure with a relatively large interlayer spacing .…”