Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102047
Keywords
CO; (2) tolerance; poly(vinyl alcohol); quasi-solid-state electrolytes; Zn-air batteries
Categories
Funding
- National Natural Science Foundation of China [21835005, 22005045]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Fundamental Research Funds for the Central Universities [2232020D-07]
- Initial Research Funds for Young Teachers of Donghua University
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A CO2-tolerant flexible quasi-solid-state electrolyte for Zn-air batteries is reported, which effectively alleviates issues caused by CO2 and exhibits higher ionic conductivity and better water retention capability. This study presents a new milestone in CO2 utilization with energy storage technology.
CO2 poisoning of alkaline electrolytes is a critical issue that affects the energy efficiency and lifespan of Zn-air batteries. However, few strategies have been explored to address this issue because it is challenging to block CO2 from the outer atmosphere. Herein, a CO2-tolerant flexible quasi-solid-state electrolyte for Zn-air batteries, which is achieved by the pre-fixation of CO2 on poly(vinyl alcohol) (PVA) via its ionization in the form of side -OCO2- groups (PVA-TMG), is reported. The pre-fixation of CO2 enables excellent CO2 tolerance and alleviates the Zn dendrite and ZnO deposition, because the -OCO2- groups can strongly interact with the Zn2+. In addition, PVA-TMG exhibits higher ionic conductivity and better water retention capability than the pristine PVA. Consequently, the fabricated Zn-air batteries deliver excellent performance in both air and a CO2-rich atmosphere. The optimized PVA-TMG presents a cycling lifetime 12 times longer than that of the pristine PVA in the atmosphere with 22.7 vol% CO2. The feasible study presented here presents a new milestone in CO2 utilization with energy storage technology.
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