Chonnam National University Unveils Tri-Layer Composite Solid Electrolyte for Lithium-Metal Batteries, Achieving 1,000+ Cycle Lifespan with Enhanced Safety

August 30, 2026

EurekAlert! South Korea

Overview

Researchers at Chonnam National University in South Korea have developed a novel tri-layer composite solid electrolyte (CSE) that significantly improves the ionic transport and suppresses dendrite formation in lithium-metal batteries (LMBs). This new electrolyte enables stable operation for over 1,000 cycles with more than 80% capacity retention in LiFePO₄|Li cells, offering a major leap in battery safety and lifespan. The breakthrough addresses critical limitations of LMBs, paving the way for their practical application in electric vehicles, aviation, and grid-scale energy storage.

In Depth

Key Findings

A research team from Chonnam National University in South Korea has achieved a significant breakthrough in lithium-metal battery (LMB) technology by developing an innovative tri-layer composite solid electrolyte (CSE). This CSE effectively enhances ionic transport while robustly suppressing lithium dendrite growth, a long-standing challenge that compromises battery safety and cycle life. The new electrolyte demonstrated remarkable performance, enabling LiFePO₄|Li cells to achieve over 1,000 charge-discharge cycles with more than 80% capacity retention and exhibiting a high ionic conductivity of 5.60 × 10⁻³ S.cm⁻¹ at 60°C.

Technical / Clinical Details

The core of this innovation lies in the optimized design of the three-layer composite, which facilitates efficient lithium-ion movement and acts as a physical barrier against dendrite penetration. Laboratory tests have shown stable cycling for over 1,000 hours. Furthermore, the battery demonstrated exceptional mechanical durability and functional reliability, continuing to power an LED even when folded or partially cut. This polymer-ceramic composite material effectively prevents internal short circuits and mitigates the thermal runaway mechanisms responsible for battery fires, significantly improving overall safety compared to conventional liquid electrolytes. The ionic conductivity achieved is approximately four times higher than that of polyethylene oxide-based electrolytes, marking a substantial step towards practical application.

Background & Context

Lithium-metal batteries are considered a cornerstone for next-generation energy storage due to their significantly higher theoretical energy density compared to current lithium-ion batteries. However, the formation of lithium dendrites on the anode during cycling has been a critical obstacle, leading to safety hazards like internal short circuits and diminished battery lifespan. This research from Chonnam National University provides a compelling solution to these challenges, opening new avenues for high-energy-density and high-safety batteries for various applications. The findings were published in the prestigious journal ‘Advanced Materials’ on August 3, 2026.

Strategic Significance & Outlook

This development holds profound implications for several industries. For electric vehicles (EVs), it could lead to substantially extended driving ranges and faster charging capabilities. The enhanced safety profile also makes LMBs more viable for demanding applications in aviation, including electric aircraft and drones, where reliability is paramount. Moreover, the long-lasting and safe characteristics of these batteries are crucial for grid-scale energy storage systems, supporting the integration of renewable energy sources. The next steps involve scaling up the technology for larger cell formats and establishing robust manufacturing processes for commercial deployment.

Source: https://www.eurekalert.org/news-releases/1141359

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