Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.282
Publication date: 18th July 2023
Solid-state batteries have undergone significant progress in the recent years, mainly driven by the development of fast solid conductors. Fulfilling the ambitious promise of high gravimetric and volumetric energy density still represents several challenges, covering the processing of materials into components, cell integration and performance. Even fast ionic conductors such as oxides, sulfides or halides dare with resistive and dynamic solid-solid interfaces which are still the main bottleneck to develop high-performance devices.
Such interfaces appear naturally when processing the materials into components or even when stacking components during cell assembly. Some examples are the active material/solid electrolyte interface present at the positive electrode, the solid electrolyte/Li metal anode interface and even between electrolyte particles after densification. Such type of resistive interfaces can be minimized to a great extent from the careful choice of materials chemistry, optimization of microstructure and processing strategies.
Interfaces in SSBs can also be dynamic as a result of the different processes taking place during cell cycling. This leads to even more complex challenges, such as volume expansion and void formation at the anode during lithium electro-platting and dissolution, lithium dendrite propagation across the solid electrolyte, cracking of the positive material from continuous redox processes and resistive interfaces formed from poor electrochemical stability between solid electrolyte and electrodes. These complex interfaces may adversely affect the Li transport, often leading to a fast decrease on the cell performance.
In this talk we will analyze key solid-solid interfaces of different electrolytes present within the cell and how they affect to the performance and ionic transport; from redox processes at the positive electrode and electrochemical stability with Li metal electrodes to dendrite propagation. Besides, we will discuss on how the engineering of interfaces may improve cell performance and paves the way towards the desired anode-less concept.
The Authors acknowledge the projects funded by the European Union`s Horizon Europe research and innovation program under grant agreement No 101069681 (HELENA) and No 875028 (SUBLIME); TED2021-129663B-C52 and TED2021-129663B-C52 financed by MCIN/AEI/10.13039/501100011033 and by the European Union NextGenerationEU/PRTR.
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