Prof. Adelhelm entwickelt alternative Batteriesysteme auf Basis von Natrium, Kalium und anderen häufigen Elementen als kostengünstige und ressourcenschonende Alternative zu Lithium-Ionen-Batterien. Sein aktueller Fokus liegt auf Natrium-Ionen-Batterien (NIBs) und Natrium-Schwefel-Feststoffbatterien, bei denen er neuartige Elektrolytmaterialien, Kathodenmaterialien und Anodenmaterialien erforscht — insbesondere durch Solvent-Co-Interkalation und die Nutzung von Kohlenstoffnanostrukturen. Die Arbeiten adressieren zentrale Herausforderungen für die Skalierbarkeit und Zyklenstabilität dieser Systeme und zielen auf industriell einsatzreife Demonstratoren für mobile und stationäre Energiespeicher ab. Die Forschung ist hochrelevant für die Elektromobilität, die Netzstabilisierung und die Energiewende in Europa, da Natrium-basierte Batterien eine technologische Diversifizierung ermöglichen und Versorgungssicherheit erhöhen.
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Prof. Dr. Philipp Adelhelm
HU-FIS-Profil ↗SIB-DE_Forschung - Sodium-Ion-Battery Deutschland (SIB:DE Initiative) - Eignung der Natrium-Ionen-Technologie für die europäische Energie- und Mobilitätswende
company
SIB-DE_Forschung - Sodium-Ion-Battery Deutschland (SIB:DE Initiative) - Eignung der Natrium-Ionen-Technologie für die europäische Energie- und Mobilitätswende
company
Entwicklung der Natrium-Ionen-Technologie für Industriell Skalierbare Energiespeicher
company
Entwicklung der Natrium-Ionen-Technologie für Industriell Skalierbare Energiespeicher
university
Effiziente Hochtemperatur-Natrium-Schwefel-Batterien
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Twinning for Rechargeable Sodium-Ion Battery Research (TwinBat)
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Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 01/2020 - 07/2022 Projektleitung: Prof. Dr. Philipp Adelhelm
Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 01/2020 - 07/2022 Projektleitung: Prof. Dr. Philipp Adelhelm
Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 01/2020 - 04/2021 Projektleitung: Prof. Dr. Philipp Adelhelm
Angewandte Chemie International Edition · DOI
Mobile and stationary energy storage by rechargeable batteries is a topic of broad societal and economical relevance. Lithium-ion battery (LIB) technology is at the forefront of the development, but a massively growing market will likely put severe pressure on resources and supply chains. Recently, sodium-ion batteries (SIBs) have been reconsidered with the aim of providing a lower-cost alternative that is less susceptible to resource and supply risks. On paper, the replacement of lithium by sodium in a battery seems straightforward at first, but unpredictable surprises are often found in practice. What happens when replacing lithium by sodium in electrode reactions? This review provides a state-of-the art overview on the redox behavior of materials when used as electrodes in lithium-ion and sodium-ion batteries, respectively. Advantages and challenges related to the use of sodium instead of lithium are discussed.
Angewandte Chemie International Edition · DOI
Although being the standard anode material in lithium-ion batteries (LIBs), graphite so far is considered to fail application in sodium-ion batteries (NIBs) because the Na-C system lacks suitable binary intercalation compounds. Here we show that this limitation can be circumvented by using co-intercalation phenomena in a diglyme-based electrolyte. The resulting compound is a stage-I ternary intercalation compound with an estimated stoichiometry of Na(diglyme)2C20. Highlights of the electrode reaction are its high energy efficiency, the small irreversible loss during the first cycle, and a superior cycle life with capacities close to 100 mAh g(-1) for 1000 cycles and coulomb efficiencies >99.87%. A one-to-one comparison with the analogue lithium-based cell shows that the sodium-based system performs better and also withstands higher currents.
Chemical Society Reviews · DOI
Reversibly intercalating ions into host materials for electrochemical energy storage is the essence of the working principle of rocking-chair type batteries. The most relevant example is the graphite anode for rechargeable Li-ion batteries which has been commercialized in 1991 and still represents the benchmark anode in Li-ion batteries 30 years later. Learning from past lessons on alkali metal intercalation in graphite, recent breakthroughs in sodium and potassium intercalation in graphite have been demonstrated for Na-ion batteries and K-ion batteries. Interestingly, some significant differences proved to exist for the intercalation of Na+ and K+ into graphite compared with the Li+ case. Such different host-guest interactions are unique depending on the host materials and electrolytes, which greatly contribute to a deeper understanding of intercalation-type electrode materials for next generation alkali metal ion batteries. This review summarizes significant advances from both experimental and theoretical calculations with a focus on comparing the intercalation of three alkali metal ions (Li+, Na+, K+) into graphite and aims to clarify the intimate host-guest relationships and the underlying mechanisms. New approaches developed to achieve favorable intercalation coupled with the challenges in this field are also discussed. We also extrapolate alkali metal ion intercalation in graphite to mono-/multi-valent ions in layered electrode materials, which will deepen the understanding of intercalation chemistry and provide guidance to explore new guests and hosts.