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Institute for Applied Materials - Energy Storage Systems (IAM-ESS)

Prof. Dr. Helmut Ehrenberg
Secretary: Frau Almut Kriese

Hermann-von-Helmholtz-Platz 1

D-76344 Eggenstein-Leopoldshafen

Tel.: +49 721 608-28501
Fax: +49 721 608-28521


office-ess∂iam kit edu






Nature Journal Publication

“Structural insights into the formation and voltage degradation of lithium- and manganese-rich layered oxides” 

Although high-energy lithium- and manganese-rich layered cathode materials can deliver 30 % excess capacity compared with today’s commercially used cathodes, the so-called voltage decay has been restricting their practical application. Here, we have investigated systematically the structural and compositional dependence of manganese-rich lithium insertion compounds on the lithium content provided during synthesis and the complexity in the synthesis pathways of layered Li[Li0.2Ni0.2Mn0.6]O2 oxide. The transformation of the lithium-rich layered phase to a lithium-poor spinel phase via an intermediate lithium-containing rock-salt phase with release of lithium/oxygen was discovered during ultra-long-term cycling.

Nat. Commun. 10, 5365 (2019)  More...

Nature Journal Publication
Nature Journal Publication

“Probing a battery electrolyte drop with ambient pressure photoelectron spectroscopy”

Operando ambient pressure photoelectron spectroscopy in realistic battery environments is a key development towards probing the functionality of the electrode/electrolyte interface in lithium-ion batteries that is not possible with conventional photoelectron spectroscopy. Here, we present the ambient pressure photoelectron spectroscopy characterization of a model electrolyte based on 1M bis(trifluoromethane)sulfonimide lithium salt in propylene carbonate. Our article provides insights into the liquid components of a lithium ion battery and the necessity to stabilize the liquid phases in ambient pressure photoelectron spectroscopy measurements.

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Nature Journal Publication

The development of low-cost and long-lasting all-climate cathode materials for sodium ion batteries is one of the key issues for the success of large-scale energy storage. Here, we synthesize a NASICON-type tuneable Na4Fe3(PO4)2(P2O7)/C nanocomposite which shows both excellent rate performance and outstanding cycling stability over more than 4400 cycles. Its air stability and all-climate properties are investigated, and its potential as the sodium host in full cells has been studied.

NASICON-Type Air-Stable and All-Climate Cathode for Sodium-Ion Batteries with Low Cost and High-Power Density


IAM-ESS ist Teil des KIT Exzellenzclusters POLIS

In der gemeinsam von KIT und Universität Ulm getragenen Initiative „Energy Storage Beyond Lithium“ arbeiten Wissenschaftlerinnen und Wissenschaftler aus Elektrochemie, Materialwissenschaften, theoretischer Modellierung und Ingenieurwissenschaften in einem multidisziplinären Ansatz zusammen.



News Archive

Microstructural Evolution of Li-Rich Layered Oxides

In article published in Advanced Energy Materials No. 1803094, Weibo Hua, Björn Schwarz,Michael Knapp, Sylvio Indris and co-workers describe the transformation processes (from spinel to rock-salt to layered structure) observed during synthesis of Li-rich Co-free layered oxides that are used as cathode materials for Li-ion batteries, on a single particle. These processes are driven by incorporation of Li and O into the Li-free precursor.

PCCP hot articles
Ausgewählt für die Hot-Article-Collection 2018 von PCCP

Der Artikel "Observation of Electrochemically Active Fe3+/Fe4+ in LiCo0.8Fe0.2MnO4 by in situ Mössbauer Spectroscopy and X-Ray Absorption Spectroscopy" ist ausgewählt für die Hot-Article-Collection 2018 von PCCP.
Dieser Artikel beschreibt das Umschalten von Fe zu hohen Oxidationszuständen in oxidischen Spinell-Materialien durch elektrochemische De-Interkalation. Dies ermöglicht das Herstellen von Hochenergie-Li-Ionen-Batterien ohne den Einsatz von kostspieligen/toxischen Elementen.
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IAM-ESS Partner im Kompetenzcluster ‚FestBatt‘

Das IAM-ESS ist innerhalb des KIT Partner des deutschlandweiten Kompetenzclusters ‚Festbatt‘ zur Entwicklung und Produktion neuartiger Festkörperbatterien. Innerhalb dieses Clusters sollen in insgesamt fünf Plattformen und verteilt über 14 wissenschaftliche Einrichtungen innerhalb Deutschlands Festelektrolyte und Festkörperbatterien erforscht und der Grundstein für die Entwicklung von Prototypen gelegt werden. Mehr…