Deciphering the Interplay between Binders and Electrolytes on the Performance of Li 4 Ti 5 O 12 Electrodes for Li-Ion Batteries

Francesca De Giorgio, Mattia Gaboardi, Lara Gigli, Sergio Brutti and Catia Arbizzani
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Francesca De Giorgio: Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN), Via P. Gobetti 101, 40129 Bologna, Italy
Mattia Gaboardi: Elettra-Sincrotrone Trieste S.C.p.A., s.s. 14—km 163.5 in Area Science Park, Basovizza, 34149 Trieste, Italy
Lara Gigli: Elettra-Sincrotrone Trieste S.C.p.A., s.s. 14—km 163.5 in Area Science Park, Basovizza, 34149 Trieste, Italy
Sergio Brutti: GISEL—National Centre of Reference for Electrochemical Energy Storage Systems, INSTM, Via G. Giusti 9, 50121 Firenze, Italy
Catia Arbizzani: Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum—Università di Bologna, Via F. Selmi 2, 40126 Bologna, Italy

Energies, 2022, vol. 15, issue 12, 1-13

Abstract: Lithium titanium oxide (Li 4 Ti 5 O 12 , LTO) is an attractive negative electrode for the development of safe—next-generation—lithium-ion batteries (LIBs). LTO can find specific applications complementary to existing alternatives for LIBs thanks to its good rate capability at high C-rates, fast lithium intercalation, and high cycling stability. Furthermore, LIBs featuring LTO electrodes are inherently safer owing to the LTO’s operating potential of 1.55 V vs. Li + /Li where the commonly used organic-based electrolytes are thermodynamically stable. Herein, we report the combined use of water-soluble sodium alginate (SA) binder and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)-tetraglyme (1m-T) electrolyte and we demonstrate the improvement of the electrochemical performance of LTO-based electrodes with respect to those operating in conventional electrolyte 1M LiPF 6 -ethylene carbonate: dimethyl carbonate (LP30). We also tackle the analysis of the impact of combining the binder/electrolyte on the long-term cycling performance of LTO electrodes featuring SA or conventional polyvinylidene fluoride (PVdF) as binders. Therefore, to assess the impact of the combination of binder/electrolyte on performance, we performed post-mortem characterization by ex situ synchrotron diffraction experiments of LTO electrodes after cycling in LP30 and 1m-T electrolytes.

Keywords: Li 4 Ti 5 O 12; LTO; synchrotron X-ray diffraction (XRD); sodium alginate binder; tetraglyme-based electrolyte (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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