Enhancing the rate capability of highly densified Li-Ion battery cathodes by selective laser ablation

Ruck, Simon; Enderle, Sebastian; Bolsinger, Marius; Weller, Manuel; Knoblauch, Volker; Riegel, Harald

doi:10.1117/12.2510073

Cited by 4 publications

(7 citation statements)

References 15 publications

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“…All-solid-state batteries are a promising battery type in terms of safety, stability and energy density (Hallinan et al, 2018;Judez et al, 2018). Polymer electrolytes are important materials in manufacture of allsolid-state batteries due to their adhesivity, processability, and chemical resistance (Ruck et al, 2019). For these reasons, they will likely play a role in composite/hybrid electrolytes, considered necessary to enable future energy storage systems.…”

Section: Introductionmentioning

confidence: 99%

Lithium Salt Dissociation in Diblock Copolymer Electrolyte Using Fourier Transform Infrared Spectroscopy

et al. 2020

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Polymer electrolytes are important materials in the manufacture of all-solid-state batteries due to their ionic conductivity, achieved by doping the polymer with salt, and mechanical strength, achieved by use of a block copolymer with a rigid block. High salt concentration is advantageous to achieve high ionic conductivity, but it makes estimation of battery performance difficult due to the breakdown of dilute-solution theory, which assumes complete ion dissociation. Therefore, practical battery design would benefit from an empirical understanding of the relationship between ion dissociation and salt concentration in block copolymer electrolyte. In this study, the dissociation of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in polystyrene (PS)poly(ethylene oxide) (PEO) diblock copolymer electrolyte was investigated using Fourier transform infrared (FTIR) spectroscopy. Quantitative analysis was performed to reveal the appearance of ion pairs and interactions between the salt and the ethylene oxide moieties with increasing salt concentration. FTIR peaks associated with polymer functional groups were found to be more useful than those of the TFSI anion for understanding the chemical state of the block copolymer electrolyte. In particular, PS peaks were used to quantify polymer dilution upon salt addition and verify that the Beer-Lambert law was valid at all concentrations investigated. PEO peaks revealed conformational changes of the polymer upon coordination with lithium ions. A previously unidentified FTIR peak was discovered that relates to polymer-salt interaction. It was used to determine the extent of salt dissociation, which compares well with a Raman study of a homopolymer electrolyte. This work definitively shows that LiTFSI dissolves into the PEO phase of the block copolymer,

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Section: Introductionmentioning

confidence: 99%

Lithium Salt Dissociation in Diblock Copolymer Electrolyte Using Fourier Transform Infrared Spectroscopy

et al. 2020

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“…The authors conclude that this is a result of the surface porosity resulting from the polymer binder that is decomposed due to the thermal impact caused by the laser material interaction. The selective surface modification of cathodes that was presented by Ruck et al [11,12] apparently leads to a surface morphology comparable to the one of the capillarity sidewalls created by laser ablation in Pfleging and Pröll [8]. The work of Ruck et al [11,13] gave an insight into the mechanisms of this photothermal laser process.…”

Section: Introductionmentioning

confidence: 95%

“…The selective surface modification of cathodes that was presented by Ruck et al [11,12] apparently leads to a surface morphology comparable to the one of the capillarity sidewalls created by laser ablation in Pfleging and Pröll [8]. The work of Ruck et al [11,13] gave an insight into the mechanisms of this photothermal laser process. When the pulsed near infrared (NIR) laser radiation couples into the highly absorbing active mass of the electrode, heat is generated therein.…”

Section: Introductionmentioning

confidence: 95%

“…As long as the process energy does not exceed a threshold value, the active material particles of the cathode are supposed to remain unaffected. The resulting surface shows an increased surface roughness, and thus, this process causes an enlargement of active surface area [11,13].…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, it was investigated to what extent the selective surface modification process presented by Ruck et al [11,12] is applicable on high energy graphite based anodes with a special focus on their wettability. To this end, the interaction of the laser with the different materials (graphite, polymeric binder, and carbon black as a conductive additive) used within the active mass of the anode in order to derive threshold values for the selective removal of the binder was elaborated.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the wettability of graphite-based lithium-ion battery anodes by selective laser surface modification using low energy nanosecond pulses

Kleefoot

Enderle

Sandherr

et al. 2021

Int J Adv Manuf Technol

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The electrolyte filling process of battery cells is one of the time-critical bottlenecks in cell production. Wetting is of particular importance here, since only completely wetted electrode sections are working. In order to accelerate and facilitate this process, the authors of this study developed a method to significantly increase the wettability of graphite-based anodes by a laser surface modification using low energy nanosecond laser pulses. The anode surface microstructure was evaluated by means of white-light interferometry and scanning electron microscopy. The assessment of wettability was done by drop test and capillary rise test of the liquid electrolyte. The results show that there is a predominantly selective ablation process for laser energy inputs below 2 J/m by which the graphite active material remains unaffected and the binder material is decomposed. The observed increase in surface roughness correlates with the increasing wettability. Investigations using Raman spectroscopy showed that laser treatment leads to a damage on the crystalline structure of the graphite particle surface. However, treating an entire anode including 6 wt% binder and conductive carbon black has shown that the overall amorphous content of the anodes surface can be reduced by 32% through treating the surface with a laser energy of 1.29 J/m. Up to that point, which is the resulting parameter range for the selective process, it is possible to ablate the amorphous binder and carbon black phase coevally exposing graphite particles while keeping their crystalline structure. Exceeding that range, ablation of the whole anode composite dominates and amorphization of the graphite surface occurs. The electrode’s capacity was tested on half-cells in coin cell format. For the whole laser parameter range investigated, the anodes capacity matches the mass loss caused by laser ablation. No additional capacity loss was observed due to amorphization of the exterior graphite particle’s surface.

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Pulsed laser 3D-micro/nanostructuring of materials for electrochemical energy storage and conversion

Wei

Yang

2023

Progress in Materials Science

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Enhancing the rate capability of highly densified Li-Ion battery cathodes by selective laser ablation

Cited by 4 publications

References 15 publications

Lithium Salt Dissociation in Diblock Copolymer Electrolyte Using Fourier Transform Infrared Spectroscopy

Lithium Salt Dissociation in Diblock Copolymer Electrolyte Using Fourier Transform Infrared Spectroscopy

Enhancement of the wettability of graphite-based lithium-ion battery anodes by selective laser surface modification using low energy nanosecond pulses

Pulsed laser 3D-micro/nanostructuring of materials for electrochemical energy storage and conversion

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