Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 10, Pages 11778-11788Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c00325
Keywords
gel electrolytes; double-network hydrogels; high conductivity; antifreezing; flexible zinc-air battery
Funding
- Natural Science Foundation of Shandong Province [ZR2019ZD45]
- National Natural Science Foundation of China [21773141, 21573132, 21902092]
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For the development of advanced flexible and wearable electronic devices, functional electrolytes with excellent conductivity, temperature tolerance, and desirable mechanical properties need to be engineered. Herein, an alkaline double-network hydrogel with high conductivity and superior mechanical and antifreezing properties is designed and promisingly utilized as the flexible electrolyte in all-solid-state zinc-air batteries. The conductive hydrogel is comprised of covalently cross-linked polyelectrolyte poly(2-acrylamido-2-methylpropanesulfonic acid potassium salt) (PAMPS-K) and interpenetrating methyl cellulose (MC) in the presence of concentrated alkaline solutions. The covalently cross-linked PAMPS-K skeleton and interpenetrating MC chains endow the hydrogel with good mechanical strength, toughness, an extremely rapid self-recovery capability, and an outstanding antifatigue property. Gratifyingly, the entrapment of a concentrated alkaline solution in the hydrogel matrix yields an extremely high ionic conductivity (105 mS cm(-1) at 25 degrees C) and an excellent antifreezing capacity. The hydrogel retains comparable conductivity and eligible strength to withstand various mechanical deformations at -20 degrees C. The all-solid-state zinc-air batteries using PAMPS-K/MC hydrogels as flexible alkaline electrolytes exhibit comparable values of specific capacity (764.7 mAh g(-1)), energy capacity (850.2 mWh g(-1)), cycling stability, and mechanical flexibility. The batteries still possess competitive electrochemical performances even when the operating temperature drops to -20 degrees C.
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