A Highly Conductive Halospinel Cathode for All-Solid-State Batteries

High-power lithium-ion batteries (LIBs) rely on highly ionically and electronically conductive cathode active materials (CAMs). While oxospinels meet these criteria and are therefore widely employed in state-of-the-art LIBs, we demonstrate that halospinels offer greatly enhanced transport properties and enable the incorporation of earth-abundant transition metals, such as iron. Using spinel-type Li<sub>2-<i>x</i></sub> FeCl<sub>4</sub> (0 < <i>x</i> ≤ 1, LFC) as a model CAM in an all-solid-state battery (ASSBs), we show that its intrinsically high ionic-electronic conductivity enables the fabrication of cathodes composed of micron-sized CAM particles with high areal capacity (>2 mA h cm<sup>-2</sup>) at practical current densities (0.5 mA cm<sup>-2</sup>) over 200 cycles. Our findings position LFC as a promising CAM, paving the way for cost-effective, high-performance ASSBs.

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Publication Details

Journal
ACS Energy Letters
Published
2025-10-31
DOI
https://doi.org/10.1021/acsenergylett.5c02476
Citations
2
Primary Topic
Advancements in Battery Materials
Type
article
Field-Weighted Citation Impact
1.46
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article

A Highly Conductive Halospinel Cathode for All-Solid-State Batteries

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ACS Energy Letters
Advancements in Battery Materials
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A Highly Conductive Halospinel Cathode for All-Solid-State Batteries

Wouter van Beek, Matthias Klimpel, Daniel Rettenwander, Maksym V. Kovalenko, Quoc Hung Nguyen, Julian F. Baumgärtner, Kostiantyn V. Kravchyk, Dmitry Chernyshov, Jaka Šivavec, Daniel Isler, Chris Černe
article en
2 citations

Abstract

High-power lithium-ion batteries (LIBs) rely on highly ionically and electronically conductive cathode active materials (CAMs). While oxospinels meet these criteria and are therefore widely employed in state-of-the-art LIBs, we demonstrate that halospinels offer greatly enhanced transport properties and enable the incorporation of earth-abundant transition metals, such as iron. Using spinel-type Li<sub>2-<i>x</i></sub> FeCl<sub>4</sub> (0 < <i>x</i> ≤ 1, LFC) as a model CAM in an all-solid-state battery (ASSBs), we show that its intrinsically high ionic-electronic conductivity enables the fabrication of cathodes composed of micron-sized CAM particles with high areal capacity (>2 mA h cm<sup>-2</sup>) at practical current densities (0.5 mA cm<sup>-2</sup>) over 200 cycles. Our findings position LFC as a promising CAM, paving the way for cost-effective, high-performance ASSBs.

ACS Energy LettersVol. 10(11)
AIT Austrian Institute of Technology GmbH (AT), Norwegian University of Science and Technology (NO), European Synchrotron Radiation Facility (FR), ETH Zurich (CH), Christian Doppler Laboratory for Thermoelectricity (AT), Swiss Federal Laboratories for Materials Science and Technology (CH)
Openalex Percentile: Top 15%
Advancements in Battery Materials
1.46
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