Separating Cationic and Anionic Redox Activity in the Lithium-Rich Antiperovskite (Li2Fe)SO
We report the electrochemical properties of the illustrative example of three different (Li2Fe)SO materials with a focus on separating cationic from anionic effects. With the high-voltage anionic process, an astonishing electrochemical capacity of around 400 mAh g–1 can initially be reached. Our results however identify the anionic process as the cause of poor cycling stability and demonstrate that the fading reported in previous literature is avoided by restricting to only the cationic processes. Following this path, our (Li2Fe)SO-BM500 shows strongly improved performance as indicated by constant electrochemical cycling over 100 cycles at a capacity of around 175 mAh g–1 at 1 C. Overall, separating and understanding the effects of the cationic from the anionic redox activity in lithium-rich antiperovskites provides the route to further improve their performance in electrochemical energy storage.
Mechanochemical synthesis of Li-rich (Li2Fe)SO cathode for Li-ion batteries
While many battery materials depend on hazardous substances and their production is also rarely sustainable, we present an environmentally friendly and sustainable approach for the synthesis of Li-rich (Li2Fe)SO using mechanochemistry based on ball milling. This one step process enables preparing a large quantity of phase-pure (Li2Fe)SO using low-cost and non-toxic precursors, making it a viable alternative to current solid state synthetic method in terms of simplicity, laboratory safety and scalability. The obtained micro-sized particles are nearly spherical and have a small size distribution. Thermodynamic measurements confirmed the high thermal stability of the ball-milled (Li2Fe)SO material. Increasing the ball to powder weight ratio was found to be an effective strategy to decrease the milling time required for the synthesis, thus promoting energy saving.
Elucidating the electrochemical reaction mechanism of lithium-rich antiperovskite cathodes for lithium-ion batteries as exemplified by (Li2Fe)SeO
We report in the context of lithium-rich antiperovskite cathode materials outstanding electrochemical properties of (Li2Fe)SeO, which for the first time was synthesized via direct ball-milling. The unique structured material displays an electrochemical cycling performance of 250 mA h g−1 at 0.1C when used as a cathode in lithium-ion batteries. Comprehensive electrochemical analysis combined with detailed transmission electron microscopy studies reveal that, above 2.5 V, the multi electron storage mechanism involves conversion of (Li2Fe)SeO to Fe1−xSex. Our results furthermore demonstrate the general relevance of our findings to the whole class of antiperovskite cathode materials and present a route to strongly enhance their cell performance by avoiding the degradation path deciphered by our studies.
Lithium-rich antiperovskite (Li2Fe)SeO: A high-performance cathode material for lithium-ion batteries
Here, we report the synthesis of antiperovskite (Li2Fe)SeO by means of an one-step solid-state method which results in phase pure material consisting of predominantly micrometer-sized particles. Electrochemical studies of (Li2Fe)SeO-based cathodes show a multi-step redox process involving electrochemical activity of cationic Fe and anionic Se. Rate capability tests yield a discharge capacity of 150 mAh g−1 and 100 mAh g−1 at 0.1 C and 1 C, respectively. In-depth kinetic analyses by in-situ electrochemical impedance spectroscopy indicate a considerable structural change primarily in the first cycle, however, the structure stabilizes afterwards in the following cycles. Accordingly, we observe superior high cycling stability. Upon cycling, the material displays only a slight capacity fading while still delivering 140 mAh g−1 after 100 cycles at 0.1 C. Our findings highlight the high performance and compelling cycling stability of (Li2Fe)SeO as cathode material in lithium-ion batteries.
SPIN2030 – AGENDA FÜR DAS WISSENSCHAFTSLAND SACHSEN
Im Rahmen der Auftaktveranstaltung in Leipzig am 3. Feb. 2023 stellten wir unsere nachhaltigen Batteriematerialien zahlreichen Besucher vor.
Am 8. Juli 2022 öffnete das Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW DD) seine Pforten für neugierige Besucher zur Langen Nacht der Wissenschaften. Neben einem breiten und bunten Angebot, sich umfassend über die neuesten Forschungsgebiete zu informieren, stellten wir auch unsere nachhaltigen Batteriematerialien vor.
In the animated video, you will learn how this new cathode material can be produced without the use of cobalt and the advantages it has over the current products on the market.
Lithiumbatterien sind in unserem Alltag omnipräsent, etwa in Smartphones oder Laptops. Forschenden ist es nun gelungen, das dabei zentrale Kathodenmaterial erheblich zu optimieren.
Link: https://www.leibniz-gemeinschaft.de/ueber-uns/neues/forschungsnachrichten/forschungsnachrichten-single/newsdetails/effizient-umweltfreundlich-guenstig
Für Batterieinteressierte von klein (Grundschule) bis groß
Li-rich anti-perovskites with high specific capacity as novel cathode materials for lithium-ion batteries
duration: 3 years (2023-2026)
project number: 516651026 (LINK)
funding: 400.000 €
project members: • Group „Functional Crystals in the Nanoscale”, Dr. Nico Gräßler, IFF (IFW DD)
• Group „Correlated Quantum Materials”, Prof. Klingeler, Kirchhoff Institute for Physics (University Heidelberg)
LUKSIAK Lithium-basierte, umweltfreundliche, kostengünstige und stabile Ionen-Akku-Kathodenmaterialien
duration: 2 years (2019 – 2021)
funding: 500.000 €
project members: • Group „Functional Crystals in the Nanoscale” IFF (IFW DD)
• Group “Analytics for Energy Storage Systems” IKM (IFW DD)
The LUKSIAK project (project-ID: 100350438) is funded by the European Social Fund (ESF) and the Sächsische Aufbaubank (SAB).
Two PhD students are supported by IFW's internal Excellence Program on "Nematic phenomena in topotactically designed antiperovskites".
duration: 3 years (2018 – 2021)
funding: 180.000 €
As part of the Lab2Lab project (Animatos, 2021), funded by the Graduate Academy of TU Dresden, a student exchange between the University of Oslo and the University of Dresden/IFW DD was made possible with a three-month stay.
2023 Front Cover Green Chemistry
2022 Solid-State Battery (Li2Fe)SO as cathode material
Lange Nacht der Wissenschaft
2021 YouTube Li-ion batteries: eco-friendly and low-cost cathodes
IFW Press Release Material with advantageous features
Leibniz-News Effizient, umweltfreundlich, günstig
2024
L. Singer, B. Dong, M.A.A. Mohamed, F.L. Carstens, S. Hampel, N. Gräßler, R. Klingeler
Separating Cationic and Anionic Redox Activity in the Lithium-Rich Antiperovskite (Li2Fe)SO
ACS Applied Materials & Interfaces 16, 40873–40880 (2024) URL
2023
L. Singer, M.A.A. Mohamed, H. Hahn, I.G. Gonzalez Martinez, M. Hantusch, K. Wenelska, E. Mijowska, B. Büchner, S. Hampel, N. Gräßler, R. Klingeler
Elucidating the electrochemical reaction mechanism of lithium-rich antiperovskite cathodes for lithium-ion batteries as exemplified by (Li2Fe)SeO
Journal of Materials Chemistry A 11, 14294-14303 (2023) URL
M.A.A. Mohamed, H.A.A. Saadallah, I.G. Gonzalez Martinez, M. Hantusch, M. Valldor, B. Büchner, S. Hampel, N. Gräßler
Mechanochemical synthesis of Li-rich (Li2Fe)SO cathode for Li-ion batteries
Green Chemistry 1-10 (2023) URL
M.A.A. Mohamed, L. Singer, H. Hahn, D. Djendjur, A. Özkara, E. Thauer, I.G. Gonzalez Martinez, M. Hantusch, B. Büchner, S. Hampel, R. Klingeler, N. Gräßler
Lithium-rich antiperovskite (Li2Fe)SeO: A high-performance cathode material for lithium-ion batteries
Journal of Power Sources 558, 232547/1-7 (2023) URL
2021
M. Mohamed, M. Gorbunov, M. Valldor, S. Hampel, N. Gräßler, D. Mikhailova
Tuning the electrochemical properties by anionic substitution of Li-rich antiperovskite (Li2Fe)S1−xSexO cathodes for Li-ion batteries
Journal of Materials Chemistry A | Volume: 9 | Issue: 40 | P. 23095 –23105 | URL
M.V. Gorbunov, S. Carocci, I.G. Gonzalez Martinez, V. Baran, D. Mikhailova
Studies of Li2Fe0.9M0.1SO antiperovskite materials for lithium-ion batteries: the role of partial Fe2+ to M2+ substitution
Frontiers in Energy Research | Volume: 9 | P. 657962/1-10 | URL
2020
M.V. Gorbunov, S. Carrocci, S. Maletti, M. Valldor, T. Doert, S. Hampel, I. Gonzalez Martinez, D. Mikhailova, N. Gräßler
Synthesis of (Li2Fe1–yMny)SO Antiperovskites with Comprehensive Investigations of (Li2Fe0.5Mn0.5)SO as Cathode in Li-ion Batteries
Inorganic Chemistry | Volume: 59 | Issue: 21 | P. 15626-15635 | URL
