TY - JOUR

T1 - Improved electrochemical properties of cathode material LiMn2O4 with conducting polymer binder

AU - Vorobeva, K.A.

AU - Eliseeva, S.N.

AU - Apraksin, R.V.

AU - Kamenskii, M.A.

AU - Tolstopjatova, E.G.

AU - Kondratiev, V.V.

PY - 2018/10/25

Y1 - 2018/10/25

N2 - 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.

AB - 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.

KW - Carboxymethylcellulose

KW - Conducting binder

KW - Electrochemistry

KW - LiMn O cathode material

KW - PEDOT:PSS

KW - Specific capacity

KW - STABILITY

KW - GRAPHITE

KW - IMPEDANCE SPECTROSCOPY

KW - INTERCALATION

KW - COMPOSITE

KW - HIGH-RATE CAPABILITY

KW - SURFACE-MODIFICATION

KW - ELECTRODE

KW - LITHIUM-ION BATTERIES

KW - LiMn2O4 cathode material

KW - PERFORMANCES

UR - http://www.scopus.com/inward/record.url?scp=85049331892&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/improved-electrochemical-properties-cathode-material-limn2o4with-conducting-polymer-binder

U2 - 10.1016/j.jallcom.2018.06.324

DO - 10.1016/j.jallcom.2018.06.324

M3 - Article

VL - 766

SP - 33

EP - 44

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -