TY - JOUR

T1 - Effects of Conductive Binder on the Electrochemical Performance of Lithium Titanate Anodes

AU - Eliseeva, S.N.

AU - Shkreba, E.V.

AU - Kamenskii, M.A.

AU - Tolstopjatova, E.G.

AU - Holze, Rudolf

AU - Kondratiev, V.V.

N1 - Funding Information: Financial support from Saint Petersburg State University (grant № 26455158 ) is gratefully acknowledged. The authors would like to thank the Center for X-ray Diffraction Methods and the Interdisciplinary Center for Nanotechnology Research park of Saint Petersburg State University, where data were obtained with support of RFBR grant № 16-03-00457.

PY - 2019/5/1

Y1 - 2019/5/1

N2 - 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.

AB - 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.

KW - Carboxymethylcellulose

KW - Conductive binder

KW - Intrinsically conducting polymer

KW - Li-ion batteries

KW - Lithium titanate

KW - Poly-3,4-ethylenedioxythiopene

KW - Polystyrene sulfonate

KW - SPINEL

KW - ELECTRODES

KW - NANOMATERIALS

KW - CATHODE MATERIAL

KW - COMPOSITE

KW - ENHANCED RATE PERFORMANCE

KW - CARBON-COATED LI4TI5O12

KW - FACILE SYNTHESIS

KW - POLYMER

KW - FABRICATION

UR - http://www.scopus.com/inward/record.url?scp=85060229390&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/effects-conductive-binder-electrochemical-performance-lithium-titanate-anodes

U2 - 10.1016/j.ssi.2019.01.011

DO - 10.1016/j.ssi.2019.01.011

M3 - Article

VL - 333

SP - 18

EP - 29

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -