CalsiumBat Calcium-Silicon alloy-based all-solid-state batteries

• Ceppetelli, Andrea; Busato, Matteo; Dilena, Gabriele; Cavallo, Carmen; Navarra, Maria Assunta & D'Angelo, Paola [Show all 11 contributors for this article] (2024). Evidence of the Electrochemical Ca2+ Intercalation in Anatase Nanotubes. Batteries & Supercaps. 7(9). doi: 10.1002/batt.202400183. Full text in Research Archive Show summary

  Here, we demonstrate the electrochemical intercalation of Ca2 + ions within the lattice of anatase nanotubes (a-NTs) synthesized by hydrothermal treatment of TiO2/NaOH precursors followed by Na+ /H+ ion exchange and H2O-loss at high temperature in air. Scanning electron microscopy, X-ray diffraction, and Raman spectroscopy confirm the formation of nanosized anatase, whereas transmission electron microscopy highlights the formation of nanotubular morphologies with an average diameter of 10 nm. TiO2 electrodes are able to deliver reversible specific capacities in aprotic batteries vs. calcium metal or in hybrid configurations vs. capacitive activated carbon using aprotic electrolytes (i. e., Ca(BH4)2 in tetrahydrofuran or Ca(TFSI)2 in dimethoxyethane, respectively). The electrochemical intercalation of Ca2 + ions into the anatase lattice is confirmed by X-ray absorption spectroscopy in close comparison with Na+ and Li+ intercalations. Ca2 + incorporation leads to the partial amorphization of the TiO2 lattice despite the limited Ca/Ti ratio (i. e., 0.09) obtained in discharge. The analysis of the extended X-ray absorption fine structure region allows the determination of the local structure of the incorporated Ca2 + ions and confirms that a disordered environment is obtained after the electrochemical reaction.

• Stievano, Lorenzo; Meatza, Iratxe de; Bitenc, Jan; Cavallo, Carmen; Brutti, Sergio & Navarra, Maria Assunta (2020). Emerging calcium batteries. Journal of Power Sources. ISSN 0378-7753. 482. doi: 10.1016/j.jpowsour.2020.228875. Full text in Research Archive

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• Cavallo, Carmen (2021). Towards high-rate anodes: from Li-ion batteries (LIBs) to Li-ion capacitors (LICs) and prospective in calcium-ion (CIB) batteries. Full text in Research Archive
• Cavallo, Carmen (2021). From low to high-rate batteries: Li-ion capacitors and Calcium-ion batteries. Full text in Research Archive
• Torgersen, Eivind; Brennhagen, Anders; Cavallo, Carmen; Geiss, Carina & Koposov, Alexey (2021). Her jakter forskerne på bedre, billigere og mer miljøvennlige batterier. [Internet]. Titan. Full text in Research Archive

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