ChemInform Abstract: LITHIUM CYCLING PERFORMANCE IN IMPROVED LITHIUM HEXAFLUOROARSENATE/2‐METHYLTETRAHYDROFURAN ELECTROLYTES

Abstract

Der verbesserte Titelelektrolyt (Darstellungs‐ und Reinigungsbedingungen sind angegeben) wird durch cyclische Voltammetrie, Puls‐Kolorimeter‐ und UV‐Absorptions‐Messungen untersucht.

Nonaqueous Liquid Electrolytes for Lithium-Based Rechargeable Batteries

“…71 Chemical deterioration was also detected, as indicated by the discoloration of the LiAsF 6 /2-Me-THF solution with time, and a reaction between LiAsF 6 and the solvent was suspected. 65,68 A mechanism was proposed based on the Lewis acidity of As(V), which cleaves the ether linkage and produces a series of gaseous and polymeric products (see Scheme 2). 68 The cathodic stability of the AsF 6 -anion was studied on a glassy carbon surface, and a reduction process was found at ∼1.15 V vs Li: 120 The above process was observed only in the initial cycles.…”

“…In the 1980s, ethers were widely preferred by researchers as an alternative candidate, because of their low viscosity and resultant high ionic conductivity, but, most of all, the better lithium morphology during cycling. 60 The cycling efficiency of lithium was reported to be 88% in tetrahydrofuran (THF), [60][61][62] an average of 96% in 2-methyltetrahydrofuran (2-Me-THF), [62][63][64][65] 97% in polymethoxy ethers 66 and dimethoxy propane, 67 and 98% in diethyl ether, 62,68 although the safety concern over the high vapor pressure of diethyl ether renders it an impractical candidate. The formation of dendritic lithium seemed to be sufficiently suppressed in these solvents even at high charge rates.…”