Minimization of Ion–Solvent Clusters in Gel Electrolytes Containing Graphene Oxide Quantum Dots for Lithium-Ion Batteries

Yen Ming Chen, Shih Ting Hsu, Yu Hsien Tseng, Te Fu Yeh, Sheng Shu Hou, Jeng Shiung Jan, Yuh Lang Lee, Hsisheng Teng

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

This study uses graphene oxide quantum dots (GOQDs) to enhance the Li+-ion mobility of a gel polymer electrolyte (GPE) for lithium-ion batteries (LIBs). The GPE comprises a framework of poly(acrylonitrile-co-vinylacetate) blended with poly(methyl methacrylate) and a salt LiPF6 solvated in carbonate solvents. The GOQDs, which function as acceptors, are small (3−11 nm) and well dispersed in the polymer framework. The GOQDs suppress the formation of ion−solvent clusters and immobilize PF6 anions, affording the GPE a high ionic conductivity and a high Li+-ion transference number (0.77). When assembled into Li|electrolyte|LiFePO4 batteries, the GPEs containing GOQDs preserve the battery capacity at high rates (up to 20 C) and exhibit 100% capacity retention after 500 charge−discharge cycles. Smaller GOQDs are more effective in GPE performance enhancement because of the higher dispersion of QDs. The minimization of both the ion−solvent clusters and degree of Li+-ion solvation in the GPEs with GOQDs results in even plating and stripping of the Li-metal anode; therefore, Li dendrite formation is suppressed during battery operation. This study demonstrates a strategy of using small GOQDs with tunable properties to effectively modulate ion−solvent coordination in GPEs and thus improve the performance and lifespan of LIBs.

Original languageEnglish
Article number1703571
JournalSmall
Volume14
Issue number12
DOIs
Publication statusPublished - 2018 Mar 22

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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