Matthias Weiling
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View article: Investigation of Degradation Pathways in Fluoroethylene Carbonate Based Electrolytes via Chromatographic Techniques
Investigation of Degradation Pathways in Fluoroethylene Carbonate Based Electrolytes via Chromatographic Techniques Open
For enhancing battery key performance indicators, like high voltage, safety, or lifetime, tailored electrolytes are crucial. Additives enable modifications of the solid electrolyte interphase (SEI) improving its electrochemical stability o…
View article: Multi‐Valent Cation Strategies for Controlling Interphase Chemistry at the Lithium Metal Anode
Multi‐Valent Cation Strategies for Controlling Interphase Chemistry at the Lithium Metal Anode Open
The effectiveness of a solid electrolyte interphase (SEI) in lithium metal batteries (LMBs) is crucial for the reversible deposition and dissolution of lithium (Li). Herein, a multi‐valent cation (MVC) is proposed approach to enable superi…
Bifunctional Electrolyte Additive Enabling Simultaneous Interphase Formation on Both Electrodes in High‐Energy Lithium‐Ion Batteries Open
The development of next‐generation Lithium‐ion batteries (LIBs) to meet the demands of advancing technology and energy storage requires focus on the formation of effective interphases on both the positive and negative electrodes. Different…
Drawing from the Old‐The First Ever Sultone as Electrolyte Additive in High‐Voltage NMC811 || AG+SiOx Multilayer Pouch Cells Open
The addition of a small amount of silicon to the anode material is a widely used approach to increase the energy density of lithium‐ion batteries (LIBs). However, its (de‐)lithiation leads to volume changes, resulting in structural degrada…
Drawing from the Old‐The First Ever Sultone as Electrolyte Additive in High‐Voltage NMC811 || AG+SiOx Multilayer Pouch Cells Open
The addition of a small amount of silicon to the anode material is a widely used approach to increase the energy density of lithium-ion batteries (LIBs). However, its (de-)lithiation leads to volume changes, resulting in structural degrada…
Comprehensive optical spectroscopy of solid-state polymer electrolytes: Harmonic and anharmonic vibrational activity and charge dynamics from terahertz to ultraviolet Open
We investigate the vibrational and electronic properties of solid-state polymer electrolytes (SPEs) using optical spectroscopy spanning an ultrabroadband range of frequencies extending from terahertz (THz) to ultraviolet (UV). The employed…
Impact of phosphazene-based compounds in an electrolyte additive mixture for enhanced safety and performance of NMC811||Si-graphite cell chemistry Open
NMC811||Si-graphite (20% Si) cells with CF 3 PFPN, VC, and PhEPi deliver robust flame-retardancy, enhanced SEI/CEI stability, lower interfacial resistance, and improved capacity retention—boosting safety and electrochemical performance.
Bifunctional Electrolyte Additive Enabling Simultaneous Interphase Formation on Both Electrodes in High‐Energy Lithium‐Ion Batteries Open
The development of next-generation Lithium-ion batteries (LIBs) to meet the demands of advancing technology and energy storage requires focus on the formation of effective interphases on both the positive and negative electrodes. Different…
Molecular Insights into the Interfacial Phenomena at the Li Metal | Polymer Solid‐State Electrolyte in Anode‐Free Configuration During Li Plating‐Stripping via Advanced Operando ATR‐FTIR Spectroscopy Open
Solid‐state batteries are regarded as safe and high‐energy‐density candidates for next‐generation energy storage. However, gaining a mechanistic understanding of the interfacial phenomena under real electrochemically working conditions rem…
Comprehensive Study on Cell Components in High‐Voltage Pouch Cells with Lithium Perchlorate: Decomposition, Transesterification, Chlorination, Deposition, and Self‐Discharge Open
Battery development has traditionally focused on high energy and long lifetime cells, but there is now a shift towards their sustainability and safety. One example of this trend is the search for fluorine‐free conductive salts. The overwhe…
Sulfonyl diimidazole to stabilize fluoroethylene carbonate-based SEI in high-voltage Li ion cells with a SiO containing negative electrode Open
Pairing nickel-rich layered oxide cathodes (e.g., LiNi0.8Mn0.1Co0.1O2 (NMC811)) with silicon-based anodes (e.g., SiOx-graphite) and simultaneously increasing the upper cut-off voltage (> 4.3 V vs. Li|Li+) offers a promising pathway to incr…
Tracing the Cross‐Talk Phenomenon of Vinylethylene Carbonate to Unveil its Counterintuitive Influence as an Electrolyte Additive on High‐Voltage Lithium‐Ion Batteries Open
The formation of effective interphases is crucial to enable high‐performance lithium‐ion batteries. This can be facilitated by the introduction of electrolyte additives, ensuring improved stability and transport properties. The identificat…
Sulfonyl diimidazole to stabilize fluoroethylene carbonate-based SEI in high-voltage Li ion cells with a SiO containing negative electrode Open
Pairing nickel-rich layered oxide cathodes (e.g., LiNi0.8Mn0.1Co0.1O2 (NMC811)) with silicon-based anodes (e.g., SiOx-graphite) and simultaneously increasing the upper cut-off voltage (> 4.3 V vs. Li|Li+) offers a promising pathway to incr…
Mechanistic Understanding of Additive Reductive Degradation and SEI Formation in High‐Voltage NMC811||SiO<sub>x</sub>‐Containing Cells via Operando ATR‐FTIR Spectroscopy Open
The implementation of silicon (Si)‐containing negative electrodes is widely discussed as an approach to increase the specific capacity of lithium‐ion batteries. However, challenges caused by severe volume changes and continuous (re‐)format…
Molecular‐Cling‐Effect of Fluoroethylene Carbonate Characterized via Ethoxy(pentafluoro)cyclotriphosphazene on SiOx/C Anode Materials – A New Perspective for Formerly Sub‐Sufficient SEI Forming Additive Compounds (Small 44/2023) Open
Silicon Anodes In article number 2302486, Martin Winter, Masoud Baghernejad, and co-workers investigate the complementary effect of fluoroethylene carbonate (FEC) and ethoxy(pentafluoro) cyclotriphosphazene as additive compounds in an apro…
A review and outlook on anionic and cationic redox in Ni-, Li- and Mn-rich layered oxides LiMeO2 (Me = Li, Ni, Co, Mn) Open
The present work reviews the charge compensation in Ni based layered oxides (LiNi1-xMexO2 with x <= 0.2, Me = Co, Mn, space group R-3m) relating performance parameters to changes in the electronic and crystallographic structure of the cath…
Molecular‐Cling‐Effect of Fluoroethylene Carbonate Characterized via Ethoxy(pentafluoro)cyclotriphosphazene on SiOx/C Anode Materials – A New Perspective for Formerly Sub‐Sufficient SEI Forming Additive Compounds Open
Effective electrolyte compositions are of primary importance in raising the performance of lithium‐ion batteries (LIBs). Recently, fluorinated cyclic phosphazenes in combination with fluoroethylene carbonate (FEC) have been introduced as p…
Quadrupled Cycle Life of High‐Voltage Nickel‐Rich Cathodes: Understanding the Effective Thiophene‐Boronic Acid‐Based CEI via Operando SHINERS Open
Increasing the cell voltage of lithium‐ion batteries (LIBs) is a straightforward approach to increasing their capacity and energy density. However, state‐of‐the‐art cathode materials like LiNi x Mn y Co 1‐x‐y O 2 (NMC) suffer from severe f…
Study of a High-Voltage NMC Interphase in the Presence of a Thiophene Additive Realized by Operando SHINERS Open
Improving the electrochemical properties and cycle life of high-voltage cathodes in lithium-ion batteries requires a deep understanding of the structural properties and failure mechanisms at the cathode electrolyte interphase (CEI). We pre…
Vibrational Spectroscopy Insight into the Electrode|electrolyte Interface/Interphase in Lithium Batteries Open
Lithium‐ion batteries (LIBs) have transformed the use of mobile electronics and storage technologies. Alongside advances in materials, an in‐depth understanding of the interfacial phenomena and interphase formation mechanisms in LIBs is cr…