April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)
Symposium Supporters
2024 MRS Spring Meeting & Exhibit
ES03.12.07

Electrochemical Performance of Si/C-Argyrodite Solid-State Composites: Limitations of The Effective Ionic Transport

When and Where

Apr 26, 2024
9:45am - 10:00am
Room 423, Level 4, Summit

Presenter(s)

Co-Author(s)

Yannik Rudel1,Wolfgang Zeier1,2

University of Münster1,Helmholtz-Institut Münster Forschungszentrum Jülich2

Abstract

Yannik Rudel1,Wolfgang Zeier1,2

University of Münster1,Helmholtz-Institut Münster Forschungszentrum Jülich2
Silicon-graphite composite electrodes have emerged as an alternative to lithium metal or silicon anodes in all solid-state batteries due to their resistance to electro-chemomechanical failure, while maintaining low lithiation potential.<sup>1</sup> While those materials are designed for lithium-ion batteries, their limited intrinsic ionic conductivity hinders application in all-solid-state batteries requiring efficient charge carrier transport in the all-solid electrodes. Therefore, a design of the effective conductivities is imperative to achieve the best electrochemical performance. This can only be achieved by understanding the relations of charge carrier transport in the used materials as well as their composites under careful consideration of their preparation.<sup>2</sup><br/>In our study, we focus on understanding the impact of charge carrier transport within a composite of silicon on graphite and argyrodite solid electrolyte on the electrochemical performance. Through a systematic variation of the Si/C to solid electrolyte ratio we show an exponential increase of the effective ionic conductivity in the anode composite with increasing content of solid electrolyte. Simultaneously, the electronic transport remains high (~S/cm) and virtually independent of the volume fraction. This enhanced effective transport in the composites translates to a substantial improvement in the specific capacities achievable when charging and discharging across various C-rates.<sup>3</sup> In addition, we investigate the influence of temperature to gain information about the activation energy of the ionic transport in the composites. Our results underscore the importance of tailoring charge carrier transport properties in solid-state composite anodes to achieve optimal electrochemical performance.<sup>3</sup><br/><br/>References:<br/>(1) Müller, J.; Abdollahifar, M.; Vinograd, A.; Nöske, M.; Nowak, C.; Chang, S. J.; Placke, T.; Haselrieder, W.; Winter, M.; Kwade, A.; Wu, N. L. Si-on-Graphite Fabricated by Fluidized Bed Process for High-Capacity Anodes of Li-Ion Batteries. Chem. Eng. J. 2021, 407, 126603. https://doi.org/10.1016/j.cej.2020.126603.<br/>(2) Janek, J.; Zeier, W. G. Challenges in Speeding up Solid-State Battery Development. Nat. Energy 2023, 8 (March), 230–240. https://doi.org/10.1038/s41560-023-01208-9.<br/>(3) Rudel, Y.; Rana, M.; Ruhl, J.; Rosenbach, C.; Müller, J.; Michalowski, P.; Kwade, A.; Zeier, W. G. Investigating the Influence of the Effective Ionic Transport on the Electrochemical Performance of Si/C-Argyrodite Solid-State Composites. Batter. Supercaps 2023, 6 (8), 1–6. https://doi.org/10.1002/batt.202300211.

Keywords

electrical properties

Symposium Organizers

Pieremanuele Canepa, University of Houston
Robert Sacci, Oak Ridge National Lab
Howard Qingsong Tu, Rochester Institute of Technology
Yan Yao, University of Houston

Symposium Support

Gold
Neware Technology LLC

Bronze
Toyota Motor Engineering and Manufacturing North America

Session Chairs

Stefan Adams
Xi Chen

In this Session