Development of all-solid-state lithium battery using quasi-solidified tetraglyme–lithium bis(trifluoromethanesulfonyl)amide–fumed silica nano-composites as electrolytes

• Published in: Journal of power sources Vol. 244; pp. 354 - 362
• Main Authors: Unemoto, Atsushi, Matsuo, Takahiro, Ogawa, Hideyuki, Gambe, Yoshiyuki, Honma, Itaru
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.12.2013; Elsevier
• Subjects: All-solid-state lithium battery; Anodic stability; Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Glyme–Li-salt equimolar complex; Materials; Quasi-solid-state electrolyte; Transport; Anodic stability; All-solid-state lithium battery; Glyme–Li-salt equimolar complex; Transport; Quasi-solid-state electrolyte; Stability; Alkaline storage battery; Solid electrolyte; Lithium; Secondary cell; Semi solid state; Nanostructure; Silica; IV-VI compound; Composite material; Lithium battery; Glyme―Li-salt equimolar complex; Silicon oxides; Solid state device; Nanocomposite
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2013.01.010

A quasi-solid-state electrolyte consisting of tetraethylene glycol dimethyl ether (tetraglyme, G4)/lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) mixtures together with fumed silica nanoparticles was prepared for use as the electrolyte of an all-solid-state lithium rechargeable battery. Via the liquid route, we have succeeded in fabricating a quasi-solid-state electrolyte regardless of the high concentration of G4/Li-TFSA such as 75 vol%. It was found that the conductivities, the self-diffusion coefficients and the structure of the G4/Li-TFSA complex in the quasi-solid-state composite are essentially similar to those of the bulks regardless of the solid-like appearance. Compared to the quasi-solid-state electrolytes containing the conventional room temperature ionic liquids (RTILs), the ones containing the equimolar G4/LiTFSA complex exhibited a higher stability to the lithium electrodes. The all-solid-state lithium rechargeable battery was assembled using LiCoO2 and lithium metal as the cathode active material and anode, respectively. The all-solid-state cells showed noticeable charge–discharge and cycle performances. In the cut-off voltage range of 4.3–3.4 V, it achieved high initial discharge capacities of 130, 110 and 90 mAh g−1 at 0.05, 0.1 and 0.2 C, respectively. Even after one hundred charge–discharge cycles, the discharge capacities remained high at 105, 100 and 95 mAh g−1, respectively. ► Quasi-solid-state electrolyte containing G4/LiTFSA are prepared. ► Quasi-solid-state electrolyte has solid-like appearances. ► Quasi-solid-state electrolyte has liquid-like conductivity and diffusivity. ► All-solid-state cell exhibited noticeable charge–discharge performance. ► Concentration polarization resistance limited the power density.