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Abstract
Chemically self-charging aqueous zinc-ion batteries (AZIBs) via air oxidation will provide new opportunities for future wearable electronic devices. Herein, we display two high-performances flexible AZIBs based on trifluorohexaazatrinaphthylene (TFHATN)/trichlorohexaazatrinaphthylene (TCLHATN) cathode, which can be recharged via air without using external power supply. The flexible Zn//TFHATN/Zn//TCLHATN battery presents good mechanical flexibility and high volumetric energy density of 9.2/10.7 mWh cm-3. The air-recharging capability originates from a spontaneous redox reaction between the discharged TFHATN/TCLHATN cathode and O2 from air. After exposed to air for 15 h, the discharged Zn//TFHATN/Zn//TCLHATN battery can be recharged to 1.2 V around, exhibits high discharge capacity, high-rate performance, higher self-charging cycle stability (8 cycles), and works well in chemical or/and galvanostatic charging mixed modes, displaying good reusability. This work provides a strategy for developing high-performance flexible air-rechargeable AZIBs.
Supplementary materials
Title
High-performance and chemically self-charging flexible aqueous zinc-ion batteries based on organic cathodes with Zn2+ and H+ storage
Description
Chemically self-charging aqueous zinc-ion batteries (AZIBs) via air oxidation will provide new opportunities for future wearable electronic devices. Herein, we display two high-performances flexible AZIBs based on trifluorohexaazatrinaphthylene (TFHATN)/trichlorohexaazatrinaphthylene (TCLHATN) cathode, which can be recharged via air without using external power supply. The flexible Zn//TFHATN/Zn//TCLHATN battery presents good mechanical flexibility and high volumetric energy density of 9.2/10.7 mWh cm-3. The air-recharging capability originates from a spontaneous redox reaction between the discharged TFHATN/TCLHATN cathode and O2 from air. After exposed to air for 15 h, the discharged Zn//TFHATN/Zn//TCLHATN battery can be recharged to 1.2 V around, exhibits high discharge capacity, high-rate performance, higher self-charging cycle stability (8 cycles), and works well in chemical or/and galvanostatic charging mixed modes, displaying good reusability. This work provides a strategy for developing high-performance flexible air-rechargeable AZIBs.
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