This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:

fact-checked

peer-reviewed publication

trusted source

proofread

New 3D polymeric structure combines lightweight properties with high energy density to enhance lithium metal batteries

New milestone for lithium metal batteries
Schematic representation of the internal geometry of the hybrid structure after lithium electrodeposition. Credit: POSTECH

A research team has developed a three-dimensional polymeric structure, a lightweight structure that facilitates the transport of lithium (Li) ions. Their study was recently published in the journal Advanced Science.

Battery technology used in such as electric vehicles and smartphones continues to evolve. Notably, have an of 3,860 mAh/g, more than 10 times that of currently commercialized graphite anodes. Lithium metal anodes can store more energy in a smaller space and, unlike graphite or silicon, can directly participate in electrochemical reactions as electrodes.

However, during the charging and discharging process, the uneven distribution of lithium ions creates areas known as "dead Li," which reduce the battery's capacity and performance. Additionally, when lithium grows in one direction, it can reach the cathode on the opposite side, causing an internal short circuit.

Although recent research has focused on optimizing lithium transport in three-dimensional structures, most of these structures rely on heavy metals, significantly compromising the battery's energy density per weight.

To address this issue, the team developed a hybrid porous structure using polyvinyl alcohol, a lightweight polymer with high affinity for lithium ions, combined with and nanocarbon spheres.

This structure is more than five times lighter than the copper (Cu) collectors typically used in battery anodes and has a high affinity for lithium ions, facilitating their migration through the spaces in the three-dimensional porous structure and enabling uniform lithium electrodeposition.

In experiments, lithium metal anode batteries incorporating the team's three-dimensional structure demonstrated high stability after over 200 charge-discharge cycles and achieved a high energy density of 344 Wh/kg (energy to total cell weight). Notably, these experiments were conducted using pouch cells, which are representative of actual industrial applications, rather than lab-scale coin cells, highlighting the technology's strong potential for commercialization.

The research was performed by Professor Soojin Park and Dong-Yeob Han, a Ph.D. candidate, from the Department of Chemistry at Pohang University of Science and Technology (POSTECH) in collaboration with Dr. Gyujin Song of Korea Institute of Energy Research (KIER) and a team of researchers at POSCO N.EX.T HUB.

Professor Park of POSTECH expressed the significance of the research by stating, "This research opens up new possibilities for maximizing the energy density of lithium metal batteries."

Dr. Song of the KIER emphasized, "This structure, which combines lightweight properties with high energy density, represents a breakthrough in future ."

More information: Dong‐Yeob Han et al, Facile Lithium Densification Kinetics by Hyperporous/Hybrid Conductor for High‐Energy‐Density Lithium Metal Batteries, Advanced Science (2024). DOI: 10.1002/advs.202402156

Journal information: Advanced Science
Citation: New 3D polymeric structure combines lightweight properties with high energy density to enhance lithium metal batteries (2024, May 23) retrieved 25 June 2024 from https://techxplore.com/news/2024-05-3d-polymeric-combines-lightweight-properties.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

New advance in all-solid-state battery technology enhances performance of lithium from the bottom

33 shares

Feedback to editors