A flow-through method for the extraction of lithium-ion battery electrolytes with supercritical and liquid carbon dioxide under addition solvents has been developed optimized to achieve quantitative electrolyte from commercial 18 650 cells.

The decomposition of state-of-the-art lithium ion battery (LIB) electrolytes leads to a highly complex mixture during cell operation. Furthermore, thermal strain by e.g., fast charging can initiate the degradation and generate various compounds. correlation electrolyte products LIB performance fading over life-time is mainly unknown. electrochemical in comprising 1 m LiPF6 dissolved 13 C3 -labeled ethylene carbonate (EC) unlabeled diethyl investigated corresponding reaction pathways are...

Abstract Lithium metal is considered to be the most promising anode for next generation of batteries if issues related safety and low coulombic efficiency can overcome. It known that initial morphology lithium has a great influence on cycling characteristics battery (LMB). Lithium‐powder‐based electrodes (Li p ‐electrodes) are reported diminish occurrence high surface area deposits. Usually, ultra‐thin foils (<50 µm) Li ‐electrodes prepared copper substrate, thus metal–metal contact...

Lithium ion batteries (LIBs) are widely used in numerous application areas, including portable consumer electronics, medicine, grid storage, electric vehicles and hybrid vehicles. One major challenge during operation storage is the degradation of cell constituents, which called aging. This phenomenon drastically reduces both lifetime cycle lifetime. Due to aging effects, originating from individual LIB constituents as well their interactions, a wide variety instruments methods necessary for...

Abstract Interphase formation during the first charge and discharge cycle(s) of a battery cell is among least understood processes in lithium‐ion batteries (LIBs). The interphases result electrolyte decomposition accompanied by gassing. direct analysis these challenging indirect methods are required to obtain information about this process. For example, indirect, ex situ analyses gaseous products can help draw conclusions occurring reactions cell. In work, origin several permanent gases...

The stability of the ionic liquid (IL) N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr14TFSI) against lithium metal at room temperature was investigated by gas chromatography/mass spectrometry (GC/MS), solid phase microextraction (SPME-GC/MS), and chromatography/high-resolution mass (GC/HR-MS). focus this work is degradation behavior mechanism Pyr14+ cation in presence as anion participation formation electrolyte interphase (SEI) IL-based systems has been, continues to...

Parasitic gas evolution in lithium ion battery (LIB) cells especially occurs within the first charge cycle, but can also take place during long-term cycling and storage, thereby, negatively affecting cell performance. Gas formation is influenced by various factors, such as chemistry operating conditions, thus, demanding fundamental studies terms of interphase (gas volume composition) electrolyte consumption. analyses mass spectrometry gaseous products are regularly performed, however,...

Abstract The breakthroughs in rechargeable lithium metal‐anode‐based batteries is still challenged by safety and performance limitations. Ionic liquid (IL)‐based electrolytes are consideration for increased but their moderate electrolyte high costs suppress usefulness Li metal‐batteries. In an effort to deepen the understanding of limited performance, galvanic corrosion as electrochemical degradation process herein identified a contributing factor toward battery cell deterioration. Four...

<title>Abstract</title> The impact of battery electric vehicles (BEVs) using lithium-ion cells (LICs) as energy storage systems is increasing and topics cell performance lifetime are becoming more important. electrolyte composition can be a limiting factor for the highly effects LICs. In this research aging process LIC electrolytes at increased temperatures (55°C) investigated. First, analyzed separately from materials afterwards extracted thermally aged LICs to investigate effect on cell....

Several electrolytes of commercially available lithium ion batteries (LIBs) were analyzed by solid phase microextraction – gas chromatography mass spectrometry (SPME-GC-MS).

Abstract Sufficient interphase formation during the first cycles is crucial for long‐term performance of lithium ion batteries. During cycles, electrolyte salt and solvent molecule decomposition caused by electrochemical instabilities leads to a wide range species contributing performance‐beneficial interphases at electrodes as well performance‐impairing side reactions. Due structural similarities carbonate educts, elucidation underlying reaction pathways complex. In this work,...

Herein we report on an analytical study of dry-shredded lithium-ion battery (LIB) materials with unknown composition. Samples from industrial recycling process were analyzed concerning the elemental composition and (organic) compound speciation. Deep understanding base material for LIB was obtained by identification analysis transition metal stoichiometry, current collector metals, electrolyte additive residues, aging marker molecules polymer binder fingerprints. For reversed engineering...

Abstract The decomposition of state‐of‐the‐art lithium ion battery (LIB) electrolytes leads to a highly complex mixture during cell operation. Furthermore, thermal strain by e.g., fast charging can initiate the degradation and generate various compounds. correlation electrolyte products LIB performance fading over life‐time is mainly unknown. electrochemical in comprising 1 m LiPF 6 dissolved 13 C 3 ‐labeled ethylene carbonate (EC) unlabeled diethyl investigated corresponding reaction...

Abstract Formation is considered a cost and time intensive production step in industrial of lithium‐ion batteries (LIBs). One solution for improvement an acceleration the formation by applying higher C‐rates. In this study, protocols with up to 2 C were applied LiNi 0.6 Mn 0.2 Co O (NMC622) II graphite pouch cells nominal capacity 5 Ah. The utilizing C‐rates result decrease overall time, but also increased gassing due additional electrolyte decomposition. resulting gas phase was...

Lithium‐ion battery (LIB) cells of the 18650 format are built in‐house with different amounts an electrolyte. After wetting and prior to subsequent formation, opened. The electrolyte is regained by centrifuging entire jelly roll quantified a gas chromatography‐flame ionization detector (GC‐FID) inductively coupled plasma‐optical emission spectroscopy (ICP‐OES). influence filling protocol applying cycles over‐ reduced pressure examined focus on composition. No significant difference found in...