Publication date: 10th April 2024
With the rapidly growing EV industry, the development of safer batteries with solid-state electrolytes is highly important. The design of composite polymer electrolytes (CPE) incorporating Li+ conductor ceramic particles inside a polymeric matrix is an interesting approach to combine the flexibility and processability of the polymers with the high ionic conductivity and electrochemical stability of ceramics. Despite the improved stability of these electrolytes, their ionic conductivity is insufficient for high-rate applications. To address this issue, a heat treatment process was proposed to remove the secondary phases from the surface of the ceramic particles and form a better interphase with the polymer matrix.
In this work, solid-state NMR spectroscopy was applied to investigate the chemical and phase evolution of LLZO garnets during heat treatment and its impact on the local Li dynamics. Using relaxometry, 1H-7Li heteronuclear correlations, and variable temperature NMR experiments, it was shown that heat treatment can effectively remove the LiOH and Li2CO3 from the surface of LLZO, and eliminate the protons from its bulk, leading to a significant improvement in the Li dynamics in LLZO powders.[1] Careful analysis of the 7Li spectra showed that removing the secondary phases on the surface of LLZO also improves the local interactions between the PEO and LLZO, ultimately leading to higher ionic conductivity and mechanical properties.[2] In the next step, 2D 7Li-7Li and 6Li-6Li EXSY NMR experiments were employed to detect the Li-ion exchange and quantify the exchange rates. Using pseudo-3D experiments, LiOH was identified as an intermediate phase for the interfacial Li exchange. Finally, 7Li → 6Li trace exchange experiments were employed to determine the Li-ion pathway through the electrolyte. It was concluded that the heat treatment of LLZO is essential for achieving CPEs with improved micro and macro-scale properties.
P.G as a part of the DESTINY PhD programme acknowledges funding from the European Union's Horizon2020 research and innovation programme under the Marie Skłodowska-Curie Actions COFUND - Grant Agreement No: 945357. This work was supported by the “Ministerio de Ciencia e Innovación/Agencia Estatal de Investigación”, under the project grant PLEC2022-009412 and TED2021-129663B-C52 and by the “European Union NextGenerationEU/PRTR".
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.