Different Shades of Li4Ti5O12 Composites : The Impact of the Binder on Interface Layer Formation

• Replacing the traditional PVdF(-HFP) electrode binder by water-soluble alternatives can potentially render electrode fabrication more environmentally benign. Herein, the surface layer formation of stored and cycled samples of two water-based Li4Ti5O12 composites employing either poly(sodium acrylate) (PAA-Na) or sodium carboxymethyl cellulose (CMC-Na) as binders are studied by X-ray photoelectron spectroscopy. In all three formulations, the surface layer composition formed upon storage differed notably from the solid-electrolyte interphase (SEI) layer formed on cycled samples. The surface layer under open-circuit conditions seems to originate mostly from the electrolyte salt (LiPF6) degradation. The comparison with cycled samples after 10 and 100 cycles shows a continuous build-up of an SEI layer on PAA-Na and PVdF-HFP electrodes. In contrast, on CMC-Na containing electrodes the SEI composition remains nearly unchanged. The results correlate well with the electrochemical behavior.

Ämnesord

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

Nyckelord

Chemistry with specialization in Materials Chemistry

Kemi med inriktning mot materialkemi

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