Investigation of Water-Soluble Binders for LiNi0.5Mn1.5O4-Based Full Cells

Two water-soluble binders of carboxymethyl cellulose (CMC) and sodium alginate (SA) have been studied in comparison with N-methylpyrrolidone-soluble poly(vinylidene difluoride-co-hexafluoropropylene) (PVdF-HFP) to understand their effect on the electrochemical performance of a high-voltage lithium nickel manganese oxide (LNMO) cathode. The electrochemical performance has been investigated in full cells using a Li4Ti5O12 (LTO) anode. At room temperature, LNMO cathodes prepared with aqueous binders provided a similar electrochemical performance as those prepared with PVdF-HFP. However, at 55 degrees C, the full cells containing LNMO with the aqueous binders showed higher cycling stability. The results are supported by intermittent current interruption resistance measurements, wherein the electrodes with SA showed lower resistance. The surface layer formed on the electrodes after cycling has been characterized by X-ray photoelectron spectroscopy. The amount of transition metal dissolutions was comparable for all three cells. However, the amount of hydrogen fluoride (HF) content in the electrolyte cycled at 55 degrees C is lower in the cell with the SA binder. These results suggest that use of water-soluble binders could provide a practical and more sustainable alternative to PVdF-based binders for the fabrication of LNMO electrodes.

Hojberg, JonathanHaldor Topsoe Res Labs, Haldor Topsoes Alle 1, DK-2800 Lyngby, Denmark. (author)
Elkjaer, Christian FinkHaldor Topsoe Res Labs, Haldor Topsoes Alle 1, DK-2800 Lyngby, Denmark. (author)
Tesfamhret, YonasUppsala universitet,Strukturkemi(Swepub:uu)yonte116 (author)
Hernández, GuiomarUppsala universitet,Strukturkemi(Swepub:uu)guihe952 (author)
Lacey, Matthew J.Scania CV AB, S-15187 Södertälje, Sweden. (author)
Younesi, RezaUppsala universitet,Strukturkemi(Swepub:uu)rezyo975 (author)
Uppsala universitetInstitutionen för kemi - Ångström (creator_code:org_t)

By the author/editor: Salian, Girish D ...; Hojberg, Jonatha ...; Elkjaer, Christi ...; Tesfamhret, Yona ...; Hernández, Guiom ...; Lacey, Matthew J ...; show more...; Younesi, Reza; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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