Improved electrochemical properties of cathode material LiMn2O4 with conducting polymer binder

Research output

7 Citations (Scopus)

Abstract

Novel LiMn 2O 4 based cathode material with eco-friendly water-based binder consisting of conducting polymer poly-3,4-ethylenedioxythiopene/polystyrene sulfonate (PEDOT:PSS) dispersion and carboxymethylcellulose (СМС) is proposed. The morphology and the structure of the composite materials were investigated by X-ray diffraction, scanning electron microscopy, EDX analysis and XPS. The electrochemical properties of modified cathode materials of different composition were investigated by cyclic voltammetry, galvanostatic charge-discharge and by electrochemical impedance spectroscopy. The results were compared with those obtained for conventional PVDF-bound LiMn 2O 4 material. It was shown that the material with optimal composition consisting of 86 wt.% of LiMn 2O 4, 10 wt.% of carbon black and 4 wt.% of conducting polymer binder exhibited good rate capability with discharge capacity 126 mAh g −1 (at 0.2 C, normalized by LiMn 2O 4 mass) and 75 mAh g −1 at 10 C as well as good cycling stability at 1 C (less than 5% decay after 200 cycles). These functional characteristics were markedly better than for PVDF-bound LiMn 2O 4 material. The electrochemical impedance spectra reveal the significant decrease of interfacial resistance and an increase of apparent diffusion coefficients for LiMn 2O 4 cathode material with conducting polymer binder, which favor improved functional characteristics.

Original languageEnglish
Pages (from-to)33-44
Number of pages12
JournalJournal of Alloys and Compounds
Volume766
DOIs
Publication statusPublished - 25 Oct 2018

Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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