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Showing 1 to 12 of 12 for “"LiPF6"”.
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Operando investigations of mechanical changes in lithium-ion batteries
… (LiFePO4) cathodes during cyclic voltammetry in LiPF6 and LiClO4-containing electrolytes. Analysis of the stress and strain derivatives in LiClO4–containing electrolytes both exhibit single peaks during lithiation and delithiation that coincide with LiFePO4 phase transformations. An additional …
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Interface Engineering and Substrate Design for Anode-free Lithium Metal Batteries
… artificial SEI in lithium hexafluorophosphate (LiPF6)-based carbonate electrolytes. The hBN interfacial layer facilitates uniform lithium deposition and promotes the formation of a stable, inorganic-rich SEI. In addition, a salt-dependent mechanism of lithium behaviour with hBN was observed. In …
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Optical diagnostics of lithium-sulfur and lithium-ion battery electrolytes using attenuated total reflection infrared spectroscopy
… to investigate decomposition of the electrolyte LiPF6 EC/DEC in Li-ion cells. As the cell geometry constraints do not allow for direct measurement of internal temperature, an optical thermometry technique was developed to relate the IR spectrum of the electrolyte to its temperature. Operando FTIR …
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Synthesis and electrochemical characterization of lithium vanadium phosphate
… composite cathodes were used in lithium anode, LiPF6 liquid electrolyte, Swage-type cells that were galvanostatically cycled from 3.OV to 4.2V and from 3.4V to 4.8V at C/20 rates. Electrochemical impedance spectroscopy was carried out on an LVP / liquid electrolyte / LVP cells from 0.01Hz to …
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Design Guidelines for Sulfonyl/Sulfamoyl Fluoride Additives to Modulate Lithium Anode Coulombic Efficiency
… the commercially relevant carbonate electrolyte LiPF6 dissolved in EC:DEC (LP40). The observed variations in CE, which suggest competitive reactions among solvents, anions, and additive, are then rationalized by characterization of post‐cycling SEI chemical compositions, gas evolution, and Li …
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Elucidation of Battery Electrolyte Coordination Sphere Thermodynamics via Calorimetric and Potentiometric Titrations
… measurements for the Li-battery relevant salts, LiPF6 and LiTFSI, in a set of polar aprotic solvents. The trends observed are rationalized by consideration of solvent and anion properties, particularly the solvent donicity and anion size. To achieve a finer picture of the Li+ coordination sphere, …
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A multi-functional electrolyte for lithium-ion batteries
… to a conventional lithium-ion electrolyte (1 M LiPF6 in 3:7 ethylene carbonate/diethyl carbonate by weight). The MFE-containing cells had higher impedance than carbonate-only cells, indicating reduced passivation capability on the electrodes. Additional investigation is warranted to refine the …
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Developing Label-free Imaging Techniques to Study Biological and Energy Conversion Processes
… been achieved in both tradition electrolyte (1M LiPF6 in EC/DMC) and engineered electrolyte systems, including highly concentrated electrolyte (4M LiFSI in DME) , and additive added electrolytes. An advanced localized high concentration electrolyte composed of 1M LiTFSI in 1,2 DME-TTE have also …
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Synthesis and characterization of aminated perfluoro polymer electrolytes
… to in this work as PFSa-PTMa. 1 M solutions of LiPF6, HCL, KOH, NaOH, CsOH, NaHCO3 and Na2CO3 were used to exchange the polymer to alternate counterion forms. Chemical structure analysis was performed using both FT and ATR infrared spectroscopy to confirm sulfonyl fluoride replacement and the …
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Study of Interfacial Chemical Reactions on Battery Electrodes Using Operando Imaging Techniques
… formation and evolution dynamics in conventional LiPF6/carbonate electrolytes with and without 50 ppm water additive, using an operando reflection interference microscope (RIM). The RIM provides high sensitivity to imaging the minimal signals caused by SEI layer and allows us to observe the entire …
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Understanding the Chemistries of Ni-rich Layered Oxide Materials for Applications in Lithium Batteries and Catalysis
… the material after probing with EC/DMC w/w 3:7 LiPF6. Additionally, this dissertation chapter features a novel voltage oscillation experiment that is employed to quantify Ni-rich oxide cathode degradation at the phase transition regions. LNO has three charging plateaus – H1 ïƒ M, M ïƒ H2, and H2 …