Highly scalable and solvent-free fabrication of a solid polymer electrolyte separator via film casting technology

Wiegmann, Eike; Helmers, Laura; Michalowski, Peter; Kwade, Arno

doi:10.1016/j.aime.2021.100065

Cited by 8 publications

(8 citation statements)

References 27 publications

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“…The ionic resistance was measured via potentiostatic electrochemical impedance spectroscopy (EIS) (ZENNIUM, Zahner, Germany) as described in Wiegmann and Helmers et al using blocking con-ditions and varied measurement temperature of 20 to 80 °C. [44] The resulting Nyquist plot and equivalent circuit are depicted for the pure PSE and different HSE types in Figure S10 and Figure S11, Supporting Information. The specific ionic conductivity was calculated using the following equation with the ionic resistance R ion , the separator thickness δ and the electrochemically active area A.…”

Section: Characterizationmentioning

confidence: 99%

Functionalized Thiophosphate and Oxidic Filler Particles for Hybrid Solid Electrolytes

Helmers,

Frankenberg,

Brokmann

et al. 2023

ChemElectroChem

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To achieve the commercialization of solid‐state‐batteries (SSBs), solid electrolyte properties need to be further improved. The hybrid solid electrolyte (HSE) approach is expected to combine the favorable properties of different solid electrolyte classes and is therefore systematically investigated. Mixing low amounts of thiophosphate or oxide filler particles (FP) into a polyethylene oxide (PEO) polyethylene glycol (PEG) and lithium salt bis(trifluoromethane)sulfonimide (LiTFSI) matrix cannot improve the electrochemical properties. Silanization of the thiophosphate FPs significantly increases the ionic conductivity to 0.1 mS cm−1 at room temperature compared to 0.017 mS cm−1 for a pure PEO solid electrolyte. Moreover, a correlation between the intrinsic conductivity of the FPs and the resulting conductivity of the HSE is observed. Also, the functionalization is successfully transferred to oxide FPs. In addition to an equally significant increase in ionic conductivity, a strong influence of the crystallite size of the FPs on the resulting ionic conductivity of the HSE was found. The discovered effect of FP surface structure on overall HSE conductivity indicates a participation of the FP surface in ion transport and emphasizes the need for tailored filler design in HSE applications.

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Section: Characterizationmentioning

confidence: 99%

Functionalized Thiophosphate and Oxidic Filler Particles for Hybrid Solid Electrolytes

Helmers,

Frankenberg,

Brokmann

et al. 2023

ChemElectroChem

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“…For example, Wiegmann et al fabricated the SPE layer composed of a PEO-based block-copolymer and LiTFSI using the extrusion method. [164] A granule consisting of a polybutylene terephthalate-PEO block-copolymer and LiTFSI was prepared, and the SPE mixture was processed in a single screw extruder at 180 °C, followed by pouring the melted SPE film on a chill roll. The SPE layer with a constant film thickness below 30 µm could be obtained.…”

Section: Dry Processmentioning

confidence: 99%

Toward High Rate Performance Solid‐State Batteries

Lee

Song

et al. 2022

Advanced Energy Materials

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“…The extrudate was then calendered at 170 °C to the desired thickness of 100 µm using a GK 300L calender from Saueressig Engineering (Vreden, Germany). A detailed description of the process for the preparation of the polymer film separator has been previously published by Wiegmann et al [23].…”

Section: Preparation Of Polymer Film Separatormentioning

confidence: 99%

Production and Characterisation of Fibre-Reinforced All-Solid-State Electrodes and Separator for the Application in Structural Batteries

2022

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The electrification of the air transport sector demands for an energy storage that adds as little volume and weight to the overall system as possible. Regarding this so-called structural battery, composites enable the storage of electrical energy in commonly used load bearing fibre composite structures. A structural battery composite can store electrical energy while bearing mechanical loads, thus reducing parasitic mass and volume. In this study, structural cathodes were prepared by slurry coating carbon fibres with lithium iron phosphate (LFP), polyethylene oxide (PEO), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and carbon black. For the structural anodes, the carbon fibres were utilised as active material and slurry coated with PEO and LiTFSI. These structural electrodes as well as a structural separator were characterised by electrochemical cycling. With 139mAh/g, the structural cathodes demonstrated good utilisation of the active material. The carbon fibres used in the anode exhibited capacities of up to 92mAh/g. High irreversible lithium losses were observed, which are attributed to the poor electrolyte wetting behaviour of the carbon fibres. A structural battery demonstrator with a lithium metal anode was realised and reached a maximum specific energy of 64Wh/kg with respect to electrode and separator weight.

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Highly scalable and solvent-free fabrication of a solid polymer electrolyte separator via film casting technology

Cited by 8 publications

References 27 publications

Functionalized Thiophosphate and Oxidic Filler Particles for Hybrid Solid Electrolytes

Functionalized Thiophosphate and Oxidic Filler Particles for Hybrid Solid Electrolytes

Toward High Rate Performance Solid‐State Batteries

Production and Characterisation of Fibre-Reinforced All-Solid-State Electrodes and Separator for the Application in Structural Batteries

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