Influence of different anode active materials and blends on the performance and fast-charging capability of lithium-ion battery cells

Gottschalk, Laura; Strzelczyk, Nanny; Adam, Alexander; Kwade, Arno

doi:10.1016/j.est.2023.107706

Cited by 7 publications

(4 citation statements)

References 46 publications

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“…In the case of the two-layer anodes, this means that a low tortuosity close to the separator is advantageous, since binder and carbon black are infiltrated in the region of the interface, forming free pores close to the separator. Another factor to consider is the electrode thickness, which was found to have a significant impact on ionic resistance in a previous study [61]. As the thickness of the two-layer anodes is approximately 5 µm less than that of the one-layer anodes, this could result in shorter diffusion paths, which in turn would reduce the ionic resistance as well.…”

Section: Structural Properties Of the Multilayer Anodesmentioning

confidence: 98%

Spherical Graphite Anodes: Influence of Particle Size Distribution and Multilayer Structuring in Lithium-Ion Battery Cells

Gottschalk,

Müller,

Schoo

et al. 2024

Batteries

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Current research focuses on lithium-ion battery cells with a high energy density and efficient fast-charging capabilities. However, transport limitations, and, therefore, the uniform diffusion of lithium-ions across the electrode layers, remain a challenge and could lead to reduced cell performance. One approach to overcome these transport challenges is the use of subsequently produced two-layer anodes with the particle size variation of spherical graphite (x50 = 18 µm; x50 = 11 µm). Thereby, a defined pore network is created, which reduces the ionic resistance and ensuring improved fast charging capabilities. The analysis focuses on the evaluation of electrode properties and the electrochemical performance. By examining the pore size distribution of the anodes, it has been found that during the manufacturing of the two-layer anodes, carbon black and binder particles are transported into the existing microstructure of the lower layer, resulting in localized densification between the anode layers. This could also be supported by color measurements. This effect also extends to electrochemical investigations, with electrochemical impedance spectroscopy showing significantly lower ionic resistances in all two-layer anodes. Reduced ionic resistance and tortuosity near the separator due to absorption effects enhance the ion diffusion and have a direct impact on anode performance. Cell ageing analysis showed a significant capacity decrease of almost 15 mAh g −1 in the single-layer references only, in contrast to the stability of the two-layer anodes. This could also be attributed to the reduced ionic resistance and active counteraction of binder migration. In conclusion, this study highlights how subsequently produced two-layer anodes significantly shape the electrode properties and cell performance of lithium-ion batteries.

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Section: Structural Properties Of the Multilayer Anodesmentioning

confidence: 98%

Spherical Graphite Anodes: Influence of Particle Size Distribution and Multilayer Structuring in Lithium-Ion Battery Cells

Gottschalk,

Müller,

Schoo

et al. 2024

Batteries

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“…Various approaches are being investigated to enhance the fast-charging capability of high-energy cells. On the material level, implementing active materials with high-rate capability, like hard carbons is the subject of current research [15][16][17]. On the electrode level, the controlled adjustment of electrode parameters like porosity, particle size distribution, as well as the implementation of an active material gradient by multilayer coating are studied [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Structural Patterns for 3D Electrodes in Lithium-Ion Batteries for Enhanced Fast-Charging Capability and Reduced Lithium Plating

Sterzl,

Pfleging

2024

Batteries

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The most common pattern types for anode structuring, in particular the line, grid, and hexagonal-arranged hole pattern were evaluated in a comparable setup in full-cells and symmetrical cells. The cells with structured electrodes were compared to reference cells with unstructured anodes of similar areal capacity (4.3 mAh cm−2) and the onset of lithium plating during fast-charging was determined in situ by differential voltage analysis of the voltage relaxation and ex situ by post-mortem analysis. Furthermore, electrochemical impedance spectroscopy measurements on symmetrical cells were used to determine the ionic resistance of structured and unstructured electrodes of similar areal capacity. All cells with structured electrodes showed lower ionic resistances and an onset of lithium plating shifted to higher C-rates compared to cells with unstructured electrodes. The structure patterns with capillary structures, i.e., lines and grids, showed significant reduced lithium plating during fast-charging and a higher rate capability compared to reference cells with unstructured electrodes and cells with hole structured electrodes. The continuous rewetting of the electrode with liquid electrolyte by capillary forces and the reduced ionic resistance of the 3D electrode are identified as key factors in improving overall battery performance. The data of the studied cells were used to calculate the resulting energy and power densities of prospective commercial pouch cells and potential pitfalls in the comparison to cells with unstructured electrodes were identified.

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“…26–28 The amount of energy and capacity that a micro-battery can hold typically relies on the active materials used in a small area. 29–31 In order to tackle these issues, different μB systems have been suggested in the last ten years, including ultrathin microelectrode (μEs) for high volumetric specific capacity and slightly thicker μEs for high areal specific capacity. 32 The thickness of the μE critically role plays in the transport distance of the negative and positive charges, leading to an increase in power density compared to larger batteries.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the recent advances in micro-electrode materials and configurations for sodium-ion micro-batteries

Moghadami,

Massoudi,

Nangir

2024

J. Mater. Chem. A

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Influence of different anode active materials and blends on the performance and fast-charging capability of lithium-ion battery cells

Cited by 7 publications

References 46 publications

Spherical Graphite Anodes: Influence of Particle Size Distribution and Multilayer Structuring in Lithium-Ion Battery Cells

Spherical Graphite Anodes: Influence of Particle Size Distribution and Multilayer Structuring in Lithium-Ion Battery Cells

Optimizing Structural Patterns for 3D Electrodes in Lithium-Ion Batteries for Enhanced Fast-Charging Capability and Reduced Lithium Plating

Unveiling the recent advances in micro-electrode materials and configurations for sodium-ion micro-batteries

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