Research team develops aqueous rechargeable batteries based on zinc anodes

Water for drinking? Nope, water for batteries
Schematic diagram of an aqueous zinc battery stabilized by a protective polymer layer. Credit: POSTECH

Can we survive three minutes without air or three days without water? How about without batteries? Imagine not having a battery for three hours.

Lightweight, high-capacity are widely used in mobile phones, laptops, and other necessities in today's world. However, the organic electrolytes in are highly flammable, leading to fatal fires or explosions. As lithium-ion batteries are widely used in our lives, such accidents can cause direct damage to users, which has led to a demand for a safer system.

Professor Soojin Park and Gyujin Song (Post-doc fellow) in the Department of Chemistry and Ph.D. candidate Sangyeop Lee of the Division of Advanced Materials Science at POSTECH together developed a stable aqueous zinc-ion battery that uses water as an electrolyte. They employed a protective polymer layer to prevent electrode corrosion and increase the stability of the zinc anode, improving the electrochemical stability of the aqueous zinc-ion battery. They published their results in Cell Reports Physical Science.

The organic-solvent-based electrolyte, which serves as a medium for ions to move inside the typical battery system, is inherently flammable, posing risk of explosion or fire. To address this issue, aqueous electrolyte batteries are being developed as promising replacements. However, the inferior reversibility of the zinc anode in aqueous electrolytes, which are caused by zinc dendrites and surface side reactions, has prevented zinc-ion batteries from being used.

The POSTECH research team developed a zinc anode coated with a multifunctional by using a block copolymer. This new polymer layer is elastic and stretchable, enduring volume expansion during battery charging and discharging.

The polymer protective layer is found to induce homogenized ion distribution and suppress dendritic growth, contributing to a long-term zinc anode lifespan. The thin film layer also improves the electrode stability by suppressing unnecessary chemical/electrochemical reactions in the electrolyte on the electrode surface.

Furthermore, the researchers revealed the movement of zinc ions in the coating layer by using time-of-flight (TOF-SIMS) analysis. Imaging the ion movements, which was not successful in previous studies, promises further research on the surface properties of battery anodes.

More information: Sangyeop Lee et al, Ion-selective and chemical-protective elastic block copolymer interphase for durable zinc metal anode, Cell Reports Physical Science (2022). DOI: 10.1016/j.xcrp.2022.101070

Journal information: Cell Reports Physical Science

Provided by Pohang University of Science & Technology (POSTECH)
Citation: Research team develops aqueous rechargeable batteries based on zinc anodes (2022, November 2) retrieved 1 February 2023 from https://techxplore.com/news/2022-11-team-aqueous-rechargeable-batteries-based.html
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