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An imidazopyrazine-derived anion for lithium conducting electrolyte application
Leszek Niedzicki,Jędrzej Korczak,Anna Bitner,Maria Bukowska,Przemyslaw Szczecinski
RSC Advances Pub Date : 11/12/2015 00:00:00 , DOI:10.1039/C5RA15869A
Abstract

In this work we present a new lithium salt of 4,5-dicyano-2-(trifluoromethyl)imidazopyrazine (LiTDPI) which was designed for use as an electrolyte in lithium-ion cells. It was synthesized and completely characterized by NMR techniques. The salt is thermally stable up to 350 °C and electrochemically stable in carbonate solvents up to +5.1 V vs. Li. Basic electrochemical characterization of this new lithium salt solution shows conductivity of over 2 mS cm−1 at room temperature and a transference number which is higher than the commercial reference salt, LiPF6 (>0.4 in a EC : DMC 1 : 2 ratio mixture). As a proof of concept, short cycling measurements in a graphite half-cell show good capacity (352 mA h g−1) and capacity retention (96% after 50 cycles). The extremely good stability without compromising the performance parameters shows the next leap in progress for tailoring efficient lithium-conducting electrolytes.

Graphical abstract: An imidazopyrazine-derived anion for lithium conducting electrolyte application
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