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Synthesis of Ionic Dendrimers and Their Potential Use as Electrolytes for Lithium–Sulfur Batteries
Author(s) -
Lebherz Tim,
Weldin Dianne L.,
Hintennach Andreas,
Buchmeiser Michael R.
Publication year - 2020
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201900436
Subject(s) - dendrimer , electrolyte , ionic conductivity , electrochemistry , lithium (medication) , viscosity , conductivity , chemistry , chemical engineering , ionic liquid , polymer chemistry , sulfur , ionic bonding , salt (chemistry) , inorganic chemistry , materials science , ion , electrode , organic chemistry , catalysis , composite material , medicine , engineering , endocrinology
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 g sulfur −1 @ 0.5 C and 780 mAh g sulfur −1 @ 1 C.