Enhancing the Performance of All-Solid-State Batteries

Pohang University of Science and Technology, Pohang, South Korea

This diagram depicts the stabilization of a lithium metal-anode-based all-solid-state battery through the bottom electrodeposition mechanism. (Image: Pohang University of Science and Technology)

A research team from Pohang University has successfully enhanced the performance and durability of all-solid-state batteries. This breakthrough was made possible through the implementation of a novel approach known as bottom electrodeposition.

Utilized in various applications such as electric vehicles and energy storage systems, secondary batteries generally rely on liquid electrolytes. However, the flammability of liquid electrolytes poses a risk of fires. This is prompting ongoing research efforts to explore the use of solid electrolytes and the metal lithium 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 electrons is harnessed to generate electricity. During the charging and discharging process, lithium metal undergoes a cycle of losing electrons, transforming into an ion, regaining electrons, and being electrodeposited back into its metallic form. However, indiscriminate electrodeposition 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). This layer exhibits exceptional lithium transfer properties, preventing random electrodeposition and promoting the process of ‘bottom electrodeposition.’ This ensures that lithium is uniformly deposited from the bottom of the anode surface.

Using a scanning electron microscope (SEM), the research team conducted an analysis that confirmed the stable electrodeposition and detachment of the 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 μm or less.

Professor Soojin Park who led the research said, “With further research, we aim to provide more effective ways to enhance battery life and increase energy density.” 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.

For more information, contact Jinyoung Huh at This email address is being protected from spambots. You need JavaScript enabled to view it.; +82 54-279-2415.