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 journalArticle

7 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

Fingerprint

Quantum Dots
Graphite
Lithium
Oxides
Graphene
Electrolytes
Semiconductor quantum dots
Gels
Ions
Polymers
Dendrites (metallography)
Carbonates
Solvation
Polymethyl Methacrylate
Ionic conductivity
Dendrites
Lithium-ion batteries
Polymethyl methacrylates
Plating
Anions

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Minimization of Ion–Solvent Clusters in Gel Electrolytes Containing Graphene Oxide Quantum Dots for Lithium-Ion Batteries",
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.",
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Minimization of Ion–Solvent Clusters in Gel Electrolytes Containing Graphene Oxide Quantum Dots for Lithium-Ion Batteries. / Chen, Yen Ming; Hsu, Shih Ting; Tseng, Yu Hsien; Yeh, Te Fu; Hou, Sheng-Shu; Jan, Jeng-Shiung; Lee, Yuh-Lang; Teng, Hsisheng.

In: Small, Vol. 14, No. 12, 1703571, 22.03.2018.

Research output: Contribution to journalArticle

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AU - Chen, Yen Ming

AU - Hsu, Shih Ting

AU - Tseng, Yu Hsien

AU - Yeh, Te Fu

AU - Hou, Sheng-Shu

AU - Jan, Jeng-Shiung

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AU - Teng, Hsisheng

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N2 - 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.

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