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:


peer-reviewed publication

trusted source


Group develops framework for high-energy-density, long life-cycle rechargeable lithium metal batteries

Group innovates high-energy-density, long life-cycle rechargeable lithium metal batteries
All the electrolytes contain 1.8 M LiFSI salt, all the tests were performed at 25 °C. a The electrostatic potential (ESP) maps of the studied ether molecules. The red, green, and white spheres stand for the O, C, and H Atoms, respectively. b The viscosity and surface tension values of the studied electrolytes and solvents. c LSV results of Li||Al coin cells at the scan rate of 0.5 mV/s. d Coulombic efficiencies of Li||NCM811 coin cells cycled between 2.8 and 4.3 V at 0.48 mA/cm2. Cathode loading is around 8.21 mg/cm2. e Chronoamperometry testing of Li||NCM811 coin cells at 4.3 V. f Long-term cycling performance of Li||NCM811 coin cells at 1.6 mAh/cm2. Two formation cycles at 0.16 and 0.8 mA/cm2 were performed. Credit: Nature Communications (2023). DOI: 10.1038/s41467-023-36647-1

Research conducted by Purdue University's Vilas Pol Energy Research (ViPER) Group shows promise for developing high-energy-density rechargeable lithium-metal batteries and addressing the electrochemical oxidation instability of ether-based electrolytes.

The research was published in the Feb. 10 issue of Nature Communications. Zheng Li, a graduate research assistant in the Davidson School of Chemical Engineering, was the lead author.

The focus of the ViPER Group is the design and fabrication of high-capacity materials for next generation safer lithium-ion, lithium-sulfur, sodium-ion, solid-state and ultralow temperature battery systems.

"The rapid growth of energy storage technologies aimed at reducing proposed carbon emission targets, and huge demands of energy storage systems also exist in the consumer electronic and electric vehicle markets. They call for next-generation Li batteries with higher energy density with enhanced safety," says Vilas Pol, a professor of chemical engineering who has led Purdue's premier laboratories for battery fabrication, electrochemical and thermal safety testing since 2014.

Replacing the conventional graphite anode material with high-energy lithium metal is a very promising approach. However, this "holy grail" anode material suffers from challenging drawbacks of low cyclability and safety, etc.

"From the perspective of fundamental research on new LMB technologies, it is critical to meticulously develop suitable liquid electrolyte chemistry that works with promising anodes and cathodes," Pol said.

In their study, the researchers demonstrated that low concentration ether-based electrolyte can successfully endure the long-term high voltage (4.3 V) operation of practical LMB under industry viable configurations, when using the highly nonpolar dipropyl ether as the electrolyte solvent.

"Realizing the long-term cycling of Li metal anode and high-voltage cathode simultaneously with dilute ether-based electrolyte is the main challenge in this study," Li said. "Ethers have poor oxidation stability despite their reasonable compatibilities to the Li metal anode. It was thus our target to extend their high-voltage capabilities. From the , we confirmed the essential correlations between the solvation behaviors of dilute ether-based electrolytes and their performance on positive electrode."

The correlations were further interpreted via detailed classical molecular dynamics (MD) simulations and density functional theory (DFT) calculations coupled with multimodal experimental analyses. It was demonstrated that regulating the solvation structure of ether-based electrolytes can rearrange the degradation order of solvation species and selectively form a robust protection on the cathode surface. It also adjusts the composition of surficial electric double layer to prevent the ether oxidation.

This unique kinetic-suppression approach differs from the conventional strategies such as using ultra-high concentration electrolyte or introducing molecular fluorination to improve the stability, which dramatically increase the battery cost. The developed LMB by the ViPER group is expected to improve 40% of , compared to the conventional Li-ion batteries.

More information: Zheng Li et al, Non-polar ether-based electrolyte solutions for stable high-voltage non-aqueous lithium metal batteries, Nature Communications (2023). DOI: 10.1038/s41467-023-36647-1

Journal information: Nature Communications

Provided by Purdue University
Citation: Group develops framework for high-energy-density, long life-cycle rechargeable lithium metal batteries (2023, March 21) retrieved 9 June 2023 from
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

Protecting lithium metal anodes to enable long cycling practical Li-S batteries


Feedback to editors