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Layer by Layer: Improved Tortuosity in High Loading Aqueous NMC811 Electrodes

delete2024-05-16
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OA
AI
L
Lukas Neidhart *
F
Froehlich, K.
B
Buket Boz
F
Franz Winter
M
Marcus Jahn
DOI：10.1149/1945-7111/ad47d2delete
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Abstract

Abstract

En 中文
Thick electrode production is a key enabler for realizing high energy density Lithium-ion batteries. Therefore, the investigation of tortuosity as a crucial limiting parameter was conducted in this work. A thickness threshold (>150 mu m) for a drastic increase in tortuosity for aqueous processed LiNi0.8Mn0.1Co0.1O2 (NMC811) electrodes was determined. Symmetrical cells, under blocking conditions, were analyzed via electrochemical impedance spectroscopy. To counteract this phenomenon, multi-layer coated electrodes with varying binder concentrations were investigated. This novel coating method, combined with the reduction of binder material, leads to a tortuosity decrease of more than 80%, when compared to high-loading electrodes (>8.5 mAhcm(-2)) coated with the conventional doctor-blade technique. Additionally, a simplified transmission line model is opposed to a linear fitting method for analyzing the impedance data.
Keywords:
Batteries-aqueous
Tortuosity
Multi-Layer Coating

Journal

Journal of the Electrochemical Society cover
Journal of the Electrochemical Society
IF:
3.3
Papers:
3.3W
Citations:
9.4W

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No organization information available