ORCID Profile
0000-0002-9221-4756
Current Organisations
Justus Liebig Universitat Giessen
,
Karlsruher Institut für Technologie
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Publisher: American Chemical Society (ACS)
Date: 29-09-2022
Publisher: American Chemical Society (ACS)
Date: 25-10-2022
Abstract: Bulk-type solid-state batteries (SSBs) composed of lithium thiophosphate superionic solid electrolytes (SEs) and high-capacity cathode active materials (CAMs) have recently attracted much attention for their potential application in next-generation electrochemical energy storage. However, compatibility issues between the key components in this kind of battery system are difficult to overcome. Here, we report on a protective cathode coating that strongly reduces the prevalence of detrimental side reactions between CAM and SE during battery operation. This is demonstrated using preformed HfO
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TA10568J
Abstract: Modification of LiNiO 2 with small amounts of W in a simple one-step synthesis process leads to changes in the crystal structure and electrochemical behavior, but it is also consequential for physical features such as the materials' morphology and thermal stability.
Publisher: Wiley
Date: 10-10-2020
Abstract: Sodium-based batteries have attracted considerable attention and are recognized as ideal candidates for large-scale and low-cost energy storage. Sodium (Na) metal anodes are considered as one of the most promising anodes for next-generation, high-energy, Na-based batteries owing to their high theoretical specific capacity (1166 mA h g
Publisher: American Chemical Society (ACS)
Date: 06-08-2021
Publisher: American Chemical Society (ACS)
Date: 09-11-2022
Publisher: American Chemical Society (ACS)
Date: 10-11-2020
Publisher: American Chemical Society (ACS)
Date: 15-08-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CP90197D
Publisher: Wiley
Date: 25-07-2018
Publisher: Wiley
Date: 10-11-2021
Abstract: The energy density of layered oxide cathode materials increases with their Ni content, while the stability decreases and degradation becomes more severe. A common strategy to mitigate or prevent degradation is the application of protective coatings on the particle surfaces. In this article, a room‐temperature, liquid‐phase reaction of trimethylaluminum (TMA) and tetraethyl orthosilicate (TEOS) with adsorbed moisture on either LiNi 0.85 Co 0.10 Mn 0.05 O 2 or LiNiO 2 , yielding a hybrid coating that shows synergetic benefits compared to coatings from TMA and TEOS in idually, is reported. The surface layer is investigated in long‐term pouch full‐cell studies as well as by electron microscopy, X‐ray photoelectron spectroscopy, and differential electrochemical mass spectrometry, demonstrating that it prevents degradation primarily by a fluorine‐scavenging effect, and by reducing the extent of rock salt‐type phase formation.
Publisher: Wiley
Date: 24-02-2022
Abstract: Improving the interfacial stability between cathode active material (CAM) and solid electrolyte (SE) is a vital step toward the development of high‐performance solid‐state batteries (SSBs). One of the challenges plaguing this field is an economical and scalable approach to fabricate high‐quality protective coatings on the CAM particles. A new wet‐coating strategy based on preformed nanoparticles is presented herein. Nonagglomerated nanoparticles of the coating material ( ≤ 5 nm, exemplified for ZrO 2 ) are prepared by solvothermal synthesis, and after surface functionalization, applied to a layered Ni‐rich oxide CAM, LiNi 0.85 Co 0.10 Mn 0.05 O 2 (NCM85), producing a uniform surface layer with a unique structure. Remarkably, when used in pelletized SSBs with argyrodite Li 6 PS 5 Cl as SE, the coated NCM85 is found to exhibit superior lithium‐storage properties ( q dis ≈ 204 mAh g NCM85 −1 at 0.1 C rate and 45 ° C) and good rate capability. The key to the observed improvement lies in the homogeneity of coating, suppressing interfacial side reactions while simultaneously limiting gas evolution during operation. Moreover, this strategy is proven to have a similar effect in liquid electrolyte‐based Li‐ion batteries and can potentially be used for the application of other, even more favorable, nanoparticle coatings.
Publisher: Wiley
Date: 27-03-2021
Abstract: Lithium‐ion batteries (LIBs), which utilize a liquid electrolyte, have established prominence among energy storage devices by offering unparalleled energy and power densities coupled with reliable electrochemical behavior. The development of solid‐state batteries (SSBs), utilizing a solid electrolyte layer for ionic conduction between the electrodes, could potentially offer further performance improvements in key areas such as energy density and safety. However, to date, SSBs remain unable to match the performance of their liquid counterparts. In light of renewed interest in accelerating the development of alternative energy storage devices, herein, a current overview of operando characterization techniques applied to solid‐state cells and related experimental setups is presented. Operando techniques, which allow materials to be studied as part of a dynamic system, have significantly advanced understanding of LIBs, and they offer the same potential for SSBs. To address this, a selection of analytical tools for probing interfacial/bulk electrochemical processes is highlighted and their advantages and challenges for studying various aspects of SSB chemistry are described. Finally, a perspective on how different techniques could support the future development of advanced SSBs is provided.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0CP90285C
Abstract: This themed collection contains a selection of articles on the topic of Understanding Dispersion Interactions in Molecular Chemistry.
Publisher: American Chemical Society (ACS)
Date: 19-03-2015
Publisher: American Chemical Society (ACS)
Date: 04-01-2023
Publisher: American Chemical Society (ACS)
Date: 24-06-2021
No related grants have been discovered for Jürgen Janek.