Influence of Nonaqueous Electrolyte on Lithium-Ion Insertion in Nanostructured V₂O₅

Abstract

not Available.

Direct Evidence of a Chemical Conversion Mechanism of Atomic-Layer-Deposited TiO2 Anodes During Lithiation Using LiPF6 Salt

“…Previously, the presence of TBA in solution has been shown to decrease the F − concentration by almost half. 26 The third electrolyte, containing LiClO 4 salt in place of LiPF 6 , was chosen as a non-fluorine-containing control. In preparation for the XPS and ToF SIMS analyses, discussed below, a total of four electrode samples were cycled in each electrolyte, with excellent repeatability.…”

“…25 Although this HF/oxide reaction process has not yet been directly observed in TiO 2 , it has previously been identified in the V 2 O 5 cathode system, where self-catalytic formation of HF led to a conversion reaction in the cathode during cycling. 26 One potential method to address this concern has been to add thin sacrificial layers of oxide that preferentially react with the HF and protect the active material, which Xiong and coworkers demonstrated using V 2 O 5 coatings on LiNiO 2 cathodes. 27 However, the question still remains as to how the presence of HF affects the lithiation of these oxide materials from a mechanistic standpoint.…”

Surface-Modified Lithiated H2V3O8: A Stable High Energy Density Cathode Material for Lithium-Ion Batteries with LiPF6 Electrolytes

“…Under the described conditions, vanadium dissolution can be expected, but only a few parts per million of vanadium were found in the electrolyte. Wu et al revealed that traces of water present in the battery electroactive core can lead to HF formation. HF is reacting with V 2 O 5 cathodes through a self-catalyzed process, both at open circuit and under potential.…”