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Home NEWS Science News Chemistry

A breakthrough in all-solid-state battery technology, enhancing the performance of the lithium from the bottom

Bioengineer by Bioengineer
March 14, 2024
in Chemistry
Reading Time: 3 mins read
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A research team, consisting of Professor Soojin Park from the Department of Chemistry, PhD candidate Sangyeop Lee from the Division of Advanced Materials Science, 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, has recently enhanced the performance and durability of all-solid-state batteries successfully. This breakthrough was made possible through the implementation of a novel approach known as bottom electrodeposition. Their research has been published in the international journal ‘Small.’

Diagram depicting the stabilization of a lithium metal anode-based all-solid-state battery through the bottom electrodeposition mechanism

Credit: POSTECH

A research team, consisting of Professor Soojin Park from the Department of Chemistry, PhD candidate Sangyeop Lee from the Division of Advanced Materials Science, 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, has recently enhanced the performance and durability of all-solid-state batteries successfully. This breakthrough was made possible through the implementation of a novel approach known as bottom electrodeposition. Their research has been published in the international journal ‘Small.’

 

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 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 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 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 scanning electron microscope (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 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.

 

The research was conducted with support from the POSCO Holdings, the Ministry of Trade, Industry and Energy, and the Korea Planning & Evaluation Institute of Industrial Technology (KEIT).



Journal

Small

DOI

10.1002/smll.202311652

Article Title

Bottom Deposition Enables Stable All-Solid-State Batteries with Ultrathin Lithium Metal Anode

Article Publication Date

15-Feb-2024

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