期刊
NANO LETTERS
卷 21, 期 24, 页码 10446-10452出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c03792
关键词
aqueous battery; zinc battery; porous separator; nonporous separator; zinc deposition; zinc stripping
类别
资金
- Cullen College Professorship
- National Science Foundation [DMR-1827474]
- Office of Electricity, Department of Energy, USA
The microstructure of separators plays a crucial role in determining the behavior of zinc electrodeposition. Porous separators direct zinc to deposit into their pores, leaving dead zinc upon stripping, while nonporous separators prevent zinc penetration. It is essential to preserve the attachment of the separator to the zinc-deposited substrate for accurate observation and conclusions.
Uncontrolled zinc electrodeposition is an obstacle to long-cycling zinc batteries. Much has been researched on regulating zinc electrodeposition, but rarely are the studies performed in the presence of a separator, as in practical cells. Here, we show that the microstructure of separators determines the electrodeposition behavior of zinc. Porous separators direct zinc to deposit into their pores and leave dead zinc upon stripping. In contrast, a nonporous separator prevents zinc penetration. Such a difference between the two types of separators is distinguished only if caution is taken to preserve the attachment of the separator to the zinc-deposited substrate during the entire electrodeposition-morphological observation process. Failure to adopt such a practice could lead to misinformed conclusions. Our work reveals the mere use of porous separators as a universal yet overlooked challenge for metal anode-based rechargeable batteries. Countermeasures to prevent direct exposure of the metal growth front to a porous structure are suggested.
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