HighlightsAdvanced Functional Materials
Publication in Advanced Functional Materials

In this study Kinetic Control of Long-Range Cationic Ordering in the Synthesis of Layered Ni-Rich Oxides
published in Advanced Functional Materials, we show the synthesis optimization of NCM622 cathode material for Lithium-ion batteries, achieving both lower energy capacity cost and high cyclability. The results can be applied to production of better Li-ion batteries for modern electronics.

Introduction to the research by ALBA Synchrotron

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Highlights_Qualitätsoffensive für bessere BatterienIrina Westermann, KIT
Qualitätsoffensive für bessere Batterien

Im Batterie-Kompetenzcluster AQua optimiert das KIT die Massenfertigung hochwertiger Lithium-Ionen-Batterien mit automatischer Fehlererkennung

Leistungsstark, ausdauernd und sicher: Mit diesen Eigenschaften und einem günstigen Preis könnten Batterien „Made in Germany“ bald zur Weltspitze gehören. Ermöglichen sollen das unter anderem fortschrittliche Ansätze zur Qualitätssicherung und Analytik bei der Produktion, die jetzt am Karlsruher Institut für Technologie (KIT) entwickelt und erprobt werden. Die Arbeit im Batterieforschungscluster AQua verläuft in enger Kooperation mit Forschungspartnern in der vom Bundesministerium für Bildung und Forschung (BMBF) initiierten „Forschungsfabrik Batterie“. 

NatureResearchnature research
Scientific reports – nature research

“Dynamics of porous and amorphous magnesium borohydride to understand solid state Mg-ion conductors”

A comprehensive study combining x-ray total scattering and quasi elastic neutron scattering (QENS) to help unravelling the complex interplay of the structure-property-relationship in crystalline and amorphous Mg-ion conductor Mg(BH4)2. In this study, published in June 2020 in scientific reports – nature research, electrochemical impedance spectroscopy of crystalline and amorphous Mg(BH4)2 confirmed that the conductivity of the latter is ~2 orders of magnitude higher at 353 K. The challenge in understanding the root cause of the observed high conductivity, is the difficulty to determine the structure of amorphous glasses in general. Since glasses are x-ray amorphous, synchrotron total scattering was performed to calculate the corresponding pair distribution functions (PDF). PDF analyses indicate a higher amount of disorder regarding the [BH4]- tetrahedra as well as the preservation of a now highly disordered 3D net of interpenetrating channels. Additionally, QENS was employed to study the rotational mobility of the [BH4] units, proofing a much larger fraction of activated [BH4] rotations in amorphous Mg(BH4)2.

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Thermally Induced Structural Reordering in Li- and Mn-Rich Layered Oxide Li Ion Cathode Materials

In this article published in Chemistry of Materials the authors describe a gradual transformation from a trigonal layered structure toward a cubic spinel structure during electrochemical cycling results in an unwanted decay of the mean charge and discharge voltages, called “voltage fade”. A structural reordering was induced by a mild thermal treatment in lithiated as well as in delithiated electrodes, which results either in a partial recovery of the initial well-ordered state or in an intensification of the structural degradation toward a spinel-type cation ordering, respectively.


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1Nature Publishing Group
Nature Journal Publication

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

Top 50 Chemistry and Materials Sciences Articles in Nature Communications:  https://www.nature.com/collections/giacagiaca

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) 

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Nature Journal Publicationjulia
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

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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.

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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.

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PCCP hot articlesPCCP
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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