Free-standing polymer electrolyte for all-solid-state lithium batteries operated at room temperature

Shih Ting Hsu, Binh T. Tran, Ramesh Subramani, Hanh T.T. Nguyen, Arunkumar Rajamani, Ming Yu Lee, Sheng Shu Hou, Yuh Lang Lee, Hsisheng Teng

Research output: Contribution to journalArticle

2 Citations (Scopus)


This study reports a networked solid polymer electrolyte (N-SPE) containing no solvent, ionic liquid, oligomer, or semisolid additives for lithium-ion batteries (LIBs). The N-SPE comprises a lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt as well as a polymer framework constructed using cage-like polyhedral oligomeric silsesquioxane (POSS) and serving as hubs to network poly(ethylene oxide-co-polypropylene oxide) (P(EO-co-PO)) chains. The networking prevents polymer chain twisting that hinders ion transport. Raman analysis indicates that the POSS hubs improve the dissociation of LiTFSI and localize TFSI anions. The N-SPE exhibits a low glass transition temperature of −43 °C, a high 25 °C ionic conductivity of 1.1 × 10−4 S cm−1, and a small activation energy of 3.5 kJ mol−1 for ion conduction. The localization of TFSI results in a high lithium transference number of 0.62, which is determined to be beneficial to Li+ transport. By incorporating the N-SPE into the LiFePO4 cathode and using a free-standing N-SPE membrane, this study assembles a Li|N-SPE|LiFePO4 battery, which delivers a high capacity of 160 mAh g−1 at 25 °C and exhibits excellent charge−discharge cycling stability. The free-standing feature of the N-SPE makes roll-to-roll assembly of LIBs readily scalable for industrial applications.

Original languageEnglish
Article number227518
JournalJournal of Power Sources
Publication statusPublished - 2020 Feb 15

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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