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Home » Research achieves stable electrodeposition in all-solid-state batteries

Research achieves stable electrodeposition in all-solid-state batteries

A research team has successfully enhanced the performance and durability of batteries. This breakthrough was made possible through the implementation of a novel approach known as bottom electrodeposition. Their research has been published in Small.

Secondary batteries generally rely on liquid electrolytes when used in various , such as electric and storage systems. However, the flammability of liquid electrolytes poses a risk of fires. This prompts ongoing research efforts to explore the use of solid electrolytes and the metal lithium (Li) in all-solid-state batteries, offering a safer option.

In the operation of all-solid-state batteries, lithium is plated onto an anode, and the movement of is harnessed to generate .

During the charging and discharging process, undergoes a cycle of losing electrons, transforming into an ion, regaining electrons, and being electrodeposited back into its metallic form. However, indiscriminate electrodeposition of lithium can quickly deplete the available lithium, leading to a significant reduction in the battery's performance and durability.

To address this issue, the research team collaborated with the POSCO N.EX.T Hub to develop an anode protection layer composed of a functional binder (PVA-g-PAA) for all-solid-state batteries. This layer exhibits exceptional lithium transfer properties, preventing random electrodeposition and promoting a process of ‘bottom electrodeposition.' This ensures that lithium is uniformly deposited from the bottom of the anode surface.

Using a (SEM), the research team conducted an analysis that confirmed the stable electrodeposition and detachment of lithium ions. This significantly reduced unnecessary lithium consumption. All-solid-state batteries developed by the team also demonstrated stable electrochemical performance over extended periods, even with lithium metal as thin as 10 micrometers (μm) or less.

Professor Soojin Park, who led the research, expressed his commitment by saying, “We have devised an enduring all-solid-state battery system through a novel electrodeposition strategy.” He added, “With further research, we aim to provide more effective ways to enhance battery life and increase .”

Building on the collaborative findings, POSCO Holdings plans to move towards the commercialization of lithium metal anodes, a core material for the next generation of secondary batteries.

The research team included Professor Park from the Department of Chemistry, Ph.D. candidate Sangyeop Lee from the Division of Advanced , and Dr. Sungjin Cho and Master's student Hyunbeen Choi from the Department of Chemistry at Pohang University of Science and Technology (POSTECH), and Dr. Jin Hong Kim and Dr. Hongyeul Bae from the POSCO N.EX.T Hub.

Source: Pohang University of Science and Technology