Xu, C. 2017. Non-aqueous Electrolytes and Interfacial Chemistry in Lithium-ion Batteries. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1525. 72 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-554-9931-0. Lithium-ion battery (LIB) technology is currently the most promising candidate for power sources in applications such as portable...

lithium-ion batteries due to their higher energy density and lower associated environmental impacts comparing to the other batteries, recently have been highly considered. the materials used in anode, are one of the most important parts affecting batteries’ energy density and environmental impacts. the aim of this study is to investigate how environmental emissions of different materials as ano...

A Li-ion cell typically consists of a carbon-based negative electrode (NE); a porous polymer membrane separator (polypropylene and/or polyethylene); and a lithiated transition metal oxide (LiMxOy, M=Co, Ni, and/or Mn) positive electrode (PE). Electrodes are made by casting slurries of PE or NE-materials, PVDF-binder and carbon-black onto metal current collectors. Mixtures of Li-salts and organi...

Due to their high theoretical capacity, transition metal oxide compounds are promising electrode materials for lithium-ion batteries. However, one drawback is associated with relevant capacity fluctuations during cycling, widely observed in the literature. Such strong variation can result practical problems when positive and negative have be matched a full cell. Herein, study of ZnMn2O4 (ZMO) n...

Figure 1: Sketches of the molecules of the individual species comprising the investigated LiPF6 in EC:DMC electrolyte solution. Hydrogen atoms are white, carbon atoms grey, oxygen atoms red, phosphor atoms orange, and fluoride atoms blue. The arrows indicate the molecular size, and include the molecules’ van der Waals radii. Insights into the Molecular Scale Structure of Electrolyte-Metal Oxide...

We report direct visualization of electrochemical lithiation and delithiation of Au anodes in a commercial LiPF6/EC/DEC electrolyte for lithium ion batteries using transmission electron microscopy (TEM). The inhomogeneous lithiation, lithium metal dendritic growth, electrolyte decomposition, and solid-electrolyte interface (SEI) formation are observed in situ. These results shed lights on strat...

The composition of the lithium cation (Li(+)) solvation shell in mixed linear and cyclic carbonate-based electrolytes has been re-examined using Born-Oppenheimer molecular dynamics (BOMD) as a function of salt concentration and cluster calculations with ethylene carbonate:dimethyl carbonate (EC:DMC)-LiPF6 as a model system. A coordination preference for EC over DMC to a Li(+) was found at low s...

.Thermal instabilities were identified in SONY-type lithium-ion cells and correlated with interactions of cell constituents and reaction products. Three temperature regions of interaction were identified and associated with the state of charge (degree of Li intercalation) of the cell. Anodes were shown to undergo exothermic reactions as low as 100°C involving the solid electrolyte interface (SE...

The reaction between an uncharged Li2FeSiO4 (LFS) cathode and a LiPF6-EC/DMC electrolyte is revealed by in situ XANES in coin cells. This study shows clear evidence of delithiation and iron oxidation in LFS prior to cycling. Subsequent cycling appears to partially restore the original lithiation level, an observation that needs to be taken into consideration in future LFS development work.

Finding a viable electrolyte for next-generation 5 V-class lithium-ion batteries is of primary importance. A long-standing obstacle has been metal-ion dissolution at high voltages. The LiPF6 salt in conventional electrolytes is chemically unstable, which accelerates transition metal dissolution of the electrode material, yet beneficially suppresses oxidative dissolution of the aluminium current...