Analysis of Ion Transport in Glyme-Based Electrolyte Solutions for Li-Air Batteries

Abstract

To clarify the relationship between ion transport behavior and Li deposition/dissolution reaction at Li metal negative electrode (NE) for Li-air batteries, 1.0 M of LiSO 3 CF 3 /tetraglyme(G4) and LiN(SO 2 CF 3 ) 2 /G4 electrolytes were selected, and the Li + transport were evaluated from two aspects, i.e. i) Li + supplying rate to the Li metal NE and ii) charge transfer rate through solid state interphase (SEI) films at Li metal NE. For the former aspect, self-diffusion coefficients D of Li + , anion and G4 solvent together with viscosity , density , ionic conductivity  of electrolytes were measured, and the degree of apparent dissociation  app of Li salts was also estimated from the D and . On the other hand, the later aspect was examined with Li | Li symmetric cells containing the glymebased electrolytes. As a result, the LiN(SO 2 CF 3 ) 2 /G4 having a higher supplying rate, i.e. , owing to its higher  app exhibited an excellent Li deposition/dissolution and Li-air cell performance.

Glyme-based electrolytes: suitable solutions for next-generation lithium batteries

“…These results suggested that a suitable anode-surface oxidation may enhance the electrode/electrolyte interface characteristics. 116,120 The electrolyte formulation and the electrochemical conditions may affect both kinetics and thermodynamics of ORR, for instance by altering the solvation in high DN solvents. Along with solvent DN, the level of dissociation of the salt may have additional contributions in determining the characteristics of ORR and controlling the morphology of Li 2 O 2 deposits, as schematically illustrated in Figure 8d.…”

“…Notably, this system could store even more energy than the Li–S cell and has been suggested as a possible battery for future applications. 105–130 In this review, we discuss with chronological details various developments in the research on glyme-based electrolytes for lithium batteries, which are summarized in the scheme in Fig. 1 (panel a).…”

Effects of Li Salt Anions and O2Gas on Li Dissolution/Deposition Behavior at Li Metal Negative Electrode for Non-Aqueous Li-Air Batteries

“…In this study, we investigated the Li dissolution/deposition reaction at the glyme electrolyte side, including the formation of SEI films on the Li metal NEs, to understand the factors affecting the Li dendrite growth. 18 Figure 1 shows a schematic illustration of the interface between the Li metal NE and the glyme electrolyte used in LAB systems. The Li deposition/dissolution reaction is thought to be controlled by two aspects, namely: i) a Li + supply process to the Li metal NE; and ii) a Li + charge transfer process through the SEI films on the surface of the Li metal NE.…”