Femtosecond Laser Processing of Thick Film Cathodes and Its Impact on Lithium-Ion Diffusion Kinetics

Pfleging, Wilhelm; Gotcu-Freis, P.

doi:10.3390/app9173588

Cited by 25 publications

(13 citation statements)

References 43 publications

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“…Laser electrode cutting can improve the qualities of the cut edges, forming less debris while shortening the processing time [1], and therefore is advantageous for industrial mass production. Recent studies show that electrochemical performances of LIBs containing laser-structured electrodes are enhanced using different laser patterning [10], such as lines [11], grids [12], and holes [13]. Cells with laser-structured NMC and LMO electrodes exhibit increased capacity retention and longer cycle life-time while being cycled at 1C [14].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of Thick-Film Li(Ni0.6Mn0.2Co0.2)O2 Cathode with Hierarchic Structures and Laser Ablation

et al. 2021

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The electrochemical performance of lithium-ion batteries is directly influenced by type of active material as well as its morphology. In order to evaluate the impact of particle morphology in thick-film electrodes, Li(Ni0.6Mn0.2Co0.2)O2 (NMC 622) cathodes with bilayer structure consisting of two different particle sizes were manufactured and electrochemically characterized in coin cells design. The hierarchical thick-film electrodes were generated by multiple casting using NMC 622 (TA) with small particle size of 6.7 µm and NMC 622 (BA) with large particle size of 12.8 µm. Besides, reference electrodes with one type of active material as well as with two type of materials established during mixing process (BT) were manufactured. The total film thickness of all hierarchical composite electrodes were kept constant at 150 µm, while the thicknesses of TA and BA were set at 1:2, 1:1, and 2:1. Meanwhile, three kinds of thin-film cathodes with 70 µm were applied to represent the state-of-the-art approach. Subsequently, ultrafast laser ablation was applied to generate groove structures inside the electrodes. The results demonstrate that cells with thin-film or thick-film cathode only containing TA, cells with bilayer electrode containing TBA 1:2, and cells with laser-structured electrodes show higher capacity at C/2 to 5C, respectively.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of Thick-Film Li(Ni0.6Mn0.2Co0.2)O2 Cathode with Hierarchic Structures and Laser Ablation

et al. 2021

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“…However, the aforesaid processing approaches involve easy failing of fabricated micronanostructure, multifarious fabricating process, or high cost. Conversely, laser surface patterning is identified as an efficient and convenient method of constructing micronanostructures. , Besides, the controllable surface morphology can be acquired via controlling laser-processing parameters . Therefore, the laser-processing method was employed in our study.…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, laser surface patterning is identified as an efficient and convenient method of constructing micronanostructures. 37,38 Besides, the controllable surface morphology can be acquired via controlling laser-processing parameters. 39 Therefore, the laser-processing method was employed in our study.…”

Section: ■ Introductionmentioning

confidence: 99%

A Contrastive Investigation on the Anticorrosive Performance of Stearic Acid and Fluoroalkylsilane-Modified Superhydrophobic Surface in Salt, Alkali, and Acid Solution

et al. 2020

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Stearic acid and fluoroalkylsilane are widely used in chemical modification to fabricate superhydrophobic surfaces in corrosion-resistant exploration. However, extensive works have just explored their anticorrosive performance in salt solution. Very rare work has focused on comparing their corrosion-resistant performance in corrosive solution (salt, alkali, and acid) systematically. In this study, two kinds of superhydrophobic surfaces were obtained on laser-processed rough IN304 surface after the stearic acid and FAS modification processes, respectively. The investigation and comparison of anticorrosion performance in salt, alkali, and acid electrolyte were carried out via potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The promotion mechanism or impairing mechanism was further proposed based on the results of surface wettability, surface morphology, and X-ray photoelectron spectroscopy. Besides, the long-term anticorrosion performance and the stability of surface wettability were also investigated. It is hoped that these research findings could provide an explicit guidance of suitable anticorrosion methods selection for metals in different kinds of corrosive solution (salt, alkali, and acid), which will further raise the promising prospect of functional surfaces for practical applications in industry.

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“…However, the theory of charge transfer processes in solid-state systems is developed insufficiently and іs based mainly on the classical theoretical assumptions formulated essentially for solid-state reactions at the "electrolyte solution-solid phase" interface. In this context, the ideas about the diffusion of protons (or ions of lithium and sodium) in solid state, occurring for example in active materials of EPS electrodes, can be frequently found in modern electrochemical literature [1][2][3][4][5][6][7]. Moreover, it is usually believed a priori that it is just diffusion of cations in solid state that retards the discharge (charge) of electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…Morphology of one or another carbon material can affect quantitative indicators of Li + ion transport to some extent. However, at the microscopic level, for all these materials, reaction (5) actually occurs in the similar graphene layer and therefore, a scatter of 10 orders of magnitude seems unlikely.…”

Section: Introductionmentioning

confidence: 99%

On the processes of migration and diffusion in the systems with solid-state reagents

Barsukov

Khomenko

Chernysh

2020

J. Electrochem. Sci. Eng.

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This paper deals with peculiarities of diffusion and migration in electrochemical systems with solid-state reagents (ESSSR). Contradictions of the diffusion model are analyzed. It is the difference of applied potentials and the corresponding electric field strength in the bulk solid phase and at the interfaces which is the primary driving force of charge transfer in ESSSR. The time characteristic of diffusion processes is not comparable to the duration of electrode processes at charging/discharging of batteries and especially electrochemical capacitors. In many real systems involving ESSSR, the process of diffusion in solid phase is absent. Examples of charge transfer processes in ESSSR (nickel hydroxide electrode, sparingly soluble quinoid compounds, Li+ intercalation in graphite, etc.) are considered, and the processes are explained using the Grothuss, tunnel and other migration mechanisms. It is shown in this paper that the linear relationship between peak currents in voltammetric curves and the square root of potential scan rate cannot be presented as an ultimate support of the diffusion model, but as а more universal property of ESSSR. In this aspect, the efficient diffusion coefficient, Deff, could be at best discussed, not to distort the ideas of charge-transfer migration mechanisms in the ESSSR.

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Femtosecond Laser Processing of Thick Film Cathodes and Its Impact on Lithium-Ion Diffusion Kinetics

Cited by 25 publications

References 43 publications

Electrochemical Performance of Thick-Film Li(Ni0.6Mn0.2Co0.2)O2 Cathode with Hierarchic Structures and Laser Ablation

Electrochemical Performance of Thick-Film Li(Ni0.6Mn0.2Co0.2)O2 Cathode with Hierarchic Structures and Laser Ablation

A Contrastive Investigation on the Anticorrosive Performance of Stearic Acid and Fluoroalkylsilane-Modified Superhydrophobic Surface in Salt, Alkali, and Acid Solution

On the processes of migration and diffusion in the systems with solid-state reagents

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