Effects of Conductive Binder on the Electrochemical Performance of Lithium Titanate Anodes

Research output

10 Citations (Scopus)

Abstract

An eco-friendly water-based binder consisting of a combination of intrinsically conducting polymer poly-3,4-ethylenedioxythiopene:polystyrene sulfonate (PEDOT:PSS) dispersion and carboxymethylcellulose (СМС) proposed as component of Li 4 Ti 5 O 12 -based negative electrode has been studied at different compositions and compared with conventional PVDF binder. Morphology and structure of the composite materials were investigated by X-ray diffraction, scanning electron microscopy and EDX analysis. Electrochemical characterization was performed by galvanostatic charge-discharge experiments, cyclic voltammetry and impedance spectroscopy. The electrode with combined PEDOT:PSS/CMC binder has superior properties, in particular increased specific capacity and improved C-rate performance during charge-discharge. By using PEDOT:PSS/CMC binder instead of PVDF, the practical specific capacity was increased up to 14% (157 mAh g −1 at 0.2 °C, normalized to total electrode mass). Highest stability during long cycling was observed for Li 4 Ti 5 O 12 -electrode with this binder at <1% decay after 100 cycles at 1 °C. Electrochemical impedance spectra reveal a significant decrease of interfacial resistance and an increase of apparent diffusion coefficients for Li 4 Ti 5 O 12 anode material with this binder, which supports improved functional characteristics of the electrode. As combined polyelectrolyte dispersion, the proposed conductive binder is an efficient alternative to the non-conductive PVDF binder for commercial lithium ion batteries.

Original languageEnglish
Pages (from-to)18-29
Number of pages12
JournalSolid State Ionics
Volume333
DOIs
Publication statusPublished - 1 May 2019

Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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