Synthesis of Ionic Dendrimers and Their Potential Use as Electrolytes for Lithium–Sulfur Batteries

Abstract

A series of ionic dendrimers is synthesized and used as conducting salt in carbonate‐based electrolytes for Li/S‐cells. The resulting electrolytes display increasing viscosity with increasing chain length of the side chains, both in the first‐ and second‐generation dendrimers. Higher conductivity is observed for the first‐generation dendrimers as compared to the second‐generation ones. While all cells show high cycle stability, the differences in dendrimer structure also influence the electrochemical behavior of the Li–S cells. Thus, discharge capacities of the corresponding Li–S cells correlate both with the viscosity and the conductivity of the electrolytes. The best electrolyte system is obtained with a first‐generation dendrimer having a short side chain, D1‐1, having the lowest viscosity and the highest conductivity, which delivers discharge capacities of 1150 mAh gsulfur−1 @ 0.5 C and 780 mAh gsulfur−1 @ 1 C.

Communication—Lithium Titanate as Mg-Ion Insertion Anode for Mg-Ion Sulfur Batteries Based on Sulfurated Poly(acrylonitrile) Composite

“…SPAN.-Particulate sulfurated-poly(acrylonitrile) (SPAN) was prepared according to the literature. 21 The obtained SPAN compound was dried in vacuo overnight, ground and sieved below 63 μm. Elemental analysis of SPAN: C, 44.08%; H, 1.048%; N, 13.66%; S, 38.32%.…”

Synthesis and Activity of Ionic Antioxidant-Functionalized PAMAMs and PPIs Dendrimers

“…However, the synthesis of ionic dendrimers has previously been described in the literature, for example, dendronized pyridinium units surrounded by a shell of carboxylic acids [8] or water-soluble polyanionic dendrimers, presenting great potential applications as antiviral drugs [9]. Ionic dendrimers have also been used as a base for polyamide membranes for ion separation [10] or electrolytes for LiS batteries [11]. Their use in the form of liquid crystals has also been investigated alongside, for instance, ionic dendrimers as poly(ethylene imine) polymers functionalized by oxadiazole [12,13] or fluorinated and perhydrogenated chains [14].…”

Ionic Liquid‐Modified Silicon Nanoparticles Composite Gel Polymer Electrolyte for High‐Performance Lithium Batteries

“…GPE with ILs as plasticizer not only obtain improved electrochemical performance, but also get high safety as result of the absence of volatile and flammable components [14] . ILs based on pyrrolidinium, [13d,15] imidazolium, [16] quaternary ammonium [16b,17] and pyridinium [18] have been studied extensively as plasticizers to improve the performance of polymer electrolytes. However, the mechanical strength of polymer electrolytes would be decreased when the liquid plasticizers are introduced in the polymer electrolytes, which restricts the further improvement of performance for GPE by only adding liquid plasticizers.…”