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journal article·2024-04-10Open access

Enabling High-Performance Hybrid Solid-State Batteries by Improving the Microstructure of Free-Standing LATP/LFP Composite Cathodes

Martin Ihrig, Enkhtsetseg Dashjav, Philipp Odenwald, Christian Dellen, Daniel Grüner, Jürgen Peter Gross, Thi Tuyet Hanh Nguyen, Yu-Hsing Lin, Walter Sebastian Scheld, Changhee Lee, Ruth Schwaiger, Abdelfattah Mahmoud, Jürgen Malzbender, Olivier Guillon, Sven Uhlenbruck, Martin Finsterbusch, Frank Tietz, Hsisheng Teng, Dina Fattakhova-Rohlfing

ACS Applied Materials & Interfaces· Volume 16· Issue 14
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Abstract

High Resolution Image Download MS PowerPoint Slide The phosphate lithium-ion conductor Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 (LATP) is an economically attractive solid electrolyte for the fabrication of safe and robust solid-state batteries, but high sintering temperatures pose a material engineering challenge for the fabrication of cell components. In particular, the high surface roughness of composite cathodes resulting from enhanced crystal growth is detrimental to their integration into cells with practical energy density. In this work, we demonstrate that efficient free-standing ceramic cathodes of LATP and LiFePO 4 (LFP) can be produced by using a scalable tape casting process. This is achieved by adding 5 wt % of Li 2 WO 4 (LWO) to the casting slurry and optimizing the fabrication process. LWO lowers the sintering temperature without affecting the phase composition of the materials, resulting in mechanically stable, electronically conductive, and free-standing cathodes with a smooth, homogeneous surface. The optimized cathode microstructure enables the deposition of a thin polymer separator attached to the Li metal anode to produce a cell with good volumetric and gravimetric energy densities of 289 Wh dm –3 and 180 Wh kg –1, respectively, on the cell level and Coulombic efficiency above 99% after 30 cycles at 30 °C.
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Research context

Energy storagePolymersCeramics & glassesCompositesMaterials processing

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Advanced Battery Technologies Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Energy and Climate Research, IEK-1: Materials Synthesis and Processing, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

Department of Chemical Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Rd., Section 4, Da’an Dist. Taipei City 106, Taiwan

Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), Universität Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany

Institute of Energy and Climate Research, IEK-2: Microstructure and Properties Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan

Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan

GREENMat, CESAM Research Unit, Institute of Chemistry B6, University of Liège, 4000 Liège, Belgium

Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University, Tainan 70101, Taiwan

Center of Applied Nanomedicine, National Cheng Kung University, Tainan 70101, Taiwan

Funding

Bundesministerium f?r Bildung und Forschung · Japan Society for the Promotion of Science · Alexander von Humboldt-Stiftung · Ministry of Science and Technology, Taiwan · National Science and Technology Council

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