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Univ. Paris-Saclay

Sujet de stage / Master 2 Internship

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Synthesis and exploration of electrochemical properties of halide-based solid electrolytes for battery applications

Contact: PONGILAT Remith, , remith.pongilat@cea.fr, +33 1 69 08 51 27
Possibility of continuation in PhD: Oui
Deadline for application:21/04/2023

Full description:
Solid-state lithium batteries offer the most desirable characteristics such as safety and higher energy densities for mobile and electric vehicle pack battery systems. All ceramic solid-state batteries consist of a composite cathode and solid electrolyte, densified by co-sintering and stacked with a metallic lithium anode or silicon anode. [1] In this study, we selected Halide-based Li3MCl3 (M=In, Er, Y) solid electrolyte material for the electrochemical experiments in solid-state battery configuration. [2] However, halide solid electrolytes are suffering from interfacial instability when in contact with lithium metal, which hinders their application in high energy density lithium metal-based solid-state battery systems. As an alternative, in this project we plan to study the electrochemical and physical properties of composite anode of carbon coated silicon nanoparticles with halide solid electrolyte. Silicon anodes are having high theoretical specific capacity of 4,200 mAh/g and are easy to prepare in thin film forms; subsequently increasing their energy density.[3] Initially, silicon anodes will be assembled in liquid electrolyte-based cells to create a baseline. Physical characterizations including XRD, TGA and Raman spectrometry will be performed on the as-synthesized materials followed by electrochemical characterizations such as cycling and EIS analysis. For detailed interface analysis, ion-beam analysis will be carried out on better-performing solid-state batteries with Si@C anode. In general, the following tasks will be tackled:

• Electrochemical performance evaluation of cells with silicon anodes
• Composite electrode preparation with halide solid electrolyte and Si@C anode
• Cycling studies on the solid-state battery configuration
• Ion-beam analysis for interface characterization

Techniques used: Electrochemical performance tests (galvanostatic cycling, impedance, rate capability, and long-term cycling) in various electrochemical setups (Swagelok and pellet pressure cells) and ion-beam analysis with the nuclear microprobe.

Profile: M2 student with strong background in Electrochemistry/Material Science/Energy technologies. A good knowledge in lithium batteries and experimental skills will be appreciated.

[1] J. C. Bachman, et. al., Chem. Rev. 2016, 116, 140−162
[2] J. Liang, et. al., Acc. Chem. Res. 2021, 54, 1023−1033
[3] C. Keller, et. al., Nanomaterials 2021, 11, 307
Technics/methods used during the internship:
Electrochemical performance tests (galvanostatic cycling, impedance, rate capability, and long-term cycling) in various electrochemical setups

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