Improved electrochemical properties of cathode material LiMn2O4 with conducting polymer binder

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

9 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Страницы (с-по)33-44
Число страниц12
ЖурналJournal of Alloys and Compounds
Том766
DOI
СостояниеОпубликовано - 25 окт 2018

Предметные области Scopus

  • Сопротивление материалов
  • Общее машиностроение
  • Металлы и сплавы
  • Химия материалов

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