Impact of ionic liquid on lithium ion battery with a solid poly(ionic liquid) pentablock terpolymer as electrolyte and separator. (17th November 2020)

• Record Type: Journal Article
• Authors: Chen, Tzu-Ling; Sun, Rui; Willis, Carl; Krutzer, Bert; Morgan, Brian F.; Beyer, Frederick L.; Han, Kee Sung; Murugesan, Vijayakumar; Elabd, Yossef A.
• Is Part Of: Polymer. Volume 209(2020)
• Publication Date: 2020-11-17
• Subjects: Ionic liquid -- Block copolymer -- Polymer electrolyte; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2020.122975
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: In this study, the physical, transport, mechanical, morphological, and electrochemical properties of a ternary blend solid polymer electrolyte (SPE) (poly(ionic liquid) (PIL) multiblock polymer, lithium salt, and ionic liquid (IL)) were systematically investigated as a function of IL concentration. With increasing IL concentration, the conductive volume increases along with the polymer chain segmental mobility. This facilitates high ionic conductivity, while the mechanical modulus exhibits a percolation threshold. Surprisingly, at higher IL concentrations, there is a reduction in the lithium cation mobility as evidenced by pulsed-field gradient nuclear magnetic resonance, which coincides with an increased overpotential evidenced by lithium metal stripping and plating. Stable lithium ion battery cycling durability (over 100 cycles at room temperature) is demonstrated with the ternary blend SPE as the electrolyte and separator. This work provides valuable insights into the design of new SPEs with both high ionic conductivity and improved battery stability. Graphical abstract: Image 1 Highlights: Ternary solid electrolyte with poly(ionic liquid) pentablock terpolymer (PILPTP). High IL concentration increases the segmental motion and ionic conductivity. Ternary PILPTP electrolyte exhibits stable room temperature battery performance.