Disordered Lithium Sublattice in Garnet-Type LLZO Achieves 10⁻³ S/cm Room-Temperature Ionic Conductivity

July 5, 2026

European Journal of Chemistry Unknown

Overview

First-principles calculations (DFT and AIMD) demonstrated that intentional disordering of the lithium sublattice in the cubic phase of garnet-type Li7La3Zr2O12 (LLZO) solid electrolyte significantly enhances Li-ion mobility. This led to achieving a high ionic conductivity of approximately 10⁻³ S/cm at room temperature, underscoring the importance of structural disorder and vacancy design for high-performance garnet-type solid electrolytes. This is a crucial discovery that accelerates the efficiency and practical application of all-solid-state batteries.

In Depth

Key Findings

A recent study, leveraging first-principles calculations (Density Functional Theory: DFT and Ab Initio Molecular Dynamics: AIMD), revealed that intentionally disordering the lithium sublattice within the cubic phase of the garnet-type solid electrolyte Li7La3Zr2O12 (LLZO) dramatically enhances lithium-ion mobility. This breakthrough achieved an exceptionally high ionic conductivity of approximately 10⁻³ S/cm at room temperature, offering new design guidelines for realizing high-performance all-solid-state batteries.

Technical Details

LLZO is a promising material for solid electrolytes in all-solid-state batteries due to its high Li-ion conductivity and stability. In this research, by employing DFT and AIMD simulations, it was discovered that a disordered distribution of lithium ions within the LLZO crystal structure (a disordered lithium sublattice), rather than an ordered arrangement at specific sites, diversifies Li-ion migration pathways and lowers activation energy barriers. This enabled the achievement of ionic conductivity levels around 10⁻³ S/cm at room temperature, significantly surpassing conventional LLZO performance. This level is comparable to liquid electrolytes, directly translating to improved fast-charging capabilities and higher power output for SSBs. The study demonstrates how atomic-level structural design, beyond mere material synthesis, profoundly impacts battery performance.

Background & Context

All-solid-state batteries are anticipated as a next-generation technology to fundamentally improve the safety, range, and charging speed of electric vehicles (EVs) and portable electronic devices. The performance of the core solid electrolyte, particularly its ionic conductivity, is one of the most critical factors determining overall battery performance. While LLZO has been extensively studied, further increasing its room-temperature ionic conductivity was key to practical application. This research, based on theoretical calculations, demonstrates the potential for dramatic performance improvements by controlling the material’s microstructure, serving as a prime example of how the fusion of materials science and battery engineering can lead to new breakthroughs.

Strategic Significance & Outlook

The design principle of lithium sublattice disordering is applicable not only to LLZO but also to the optimization of other garnet-type or related solid electrolyte materials, significantly opening new avenues for future high-performance solid electrolyte development. This research outcome validates the effectiveness of ‘materials informatics,’ where theoretical design guides experimental synthesis, drastically increasing the efficiency of new material discovery. In the future, new solid electrolytes developed based on this design principle are expected to accelerate the commercialization of safer and higher-performance all-solid-state batteries, bringing revolutionary impacts to the EV and energy storage system markets.

Source: https://www.eurjchem.com/index.php/eurjchem/article/view/2759

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