X-ray micro tomography of three-dimensional embroidered current collectors for lithium-ion batteries

Aguiló-Aguayo, Noemí; Amann, Peter; Espiñeira, Pablo Pena; Petrasch, Joerg; Bechtold, Thomas

doi:10.1016/j.jpowsour.2015.10.039

Cited by 8 publications

(6 citation statements)

References 26 publications

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“…The discrepancy may be attributed to areas in the embroidered structure that were not accessed by the cathode material. There was no evidence of signicant voids in the micro-tomography images of the embroidered cathodes, 14 hence it is likely that the inaccessible parts correspond to the spaces between bres in the polyester background and the back yarns.…”

Section: Resultsmentioning

confidence: 97%

“…Previously, we reported on the morphological characterization of embroidered electrodes. 14 In this paper, we focus on the electrochemical behaviour (galvanostatic charge/discharge cycles, EIS measurements) of thick LiFePO 4 cathodes prepared with 3D embroidered aluminium current collectors and compared them with the conventional aluminium foil conguration.…”

Section: A Introductionmentioning

confidence: 99%

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Three-dimensional embroidered current collectors for ultra-thick electrodes in batteries

et al. 2016

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Section: Resultsmentioning

confidence: 97%

Section: A Introductionmentioning

confidence: 99%

Three-dimensional embroidered current collectors for ultra-thick electrodes in batteries

et al. 2016

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“…Wires are separated at a distance of 0.625 mm. Further details of the layout can be found in Reference [ 20 ]. The front Cu wires formed loops to hold the Cu embroidered structure.…”

Section: Resultsmentioning

confidence: 99%

“…The PES fabric was dissolved with a 1 M NaOH solution in ethanol (96%) at 60 °C for 8 h in a water bath and then cooled down to room temperature for 14 h. The embroidered layout consisted of a vertical and horizontal arrangement of 80 µm Cu wires with a wire interspacing of 0.625 mm. Further details of the layout are described elsewhere [ 20 ].…”

Section: Methodsmentioning

confidence: 99%

New Three-Dimensional Porous Electrode Concept: Vertically-Aligned Carbon Nanotubes Directly Grown on Embroidered Copper Structures

et al. 2017

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New three-dimensional (3D) porous electrode concepts are required to overcome limitations in Li-ion batteries in terms of morphology (e.g., shapes, dimensions), mechanical stability (e.g., flexibility, high electroactive mass loadings), and electrochemical performance (e.g., low volumetric energy densities and rate capabilities). Here a new electrode concept is introduced based on the direct growth of vertically-aligned carbon nanotubes (VA-CNTs) on embroidered Cu current collectors. The direct growth of VA-CNTs was achieved by plasma-enhanced chemical vapor deposition (PECVD), and there was no application of any post-treatment or cleaning procedure. The electrochemical behavior of the as-grown VA-CNTs was analyzed by charge/discharge cycles at different specific currents and with electrochemical impedance spectroscopy (EIS) measurements. The results were compared with values found in the literature. The as-grown VA-CNTs exhibit higher specific capacities than graphite and pristine VA-CNTs found in the literature. This together with the possibilities that the Cu embroidered structures offer in terms of specific surface area, total surface area, and designs provide a breakthrough in new 3D electrode concepts.

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“…We recently proposed the use of 3D embroidered structures as current collectors as another alternative to prepare thick electrodes [11][12][13] . In contrast to metal foams, there are no open wire ends due to the near-net-shape manufacturing of the embroidered structures.…”

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confidence: 99%

Water-based slurries for high-energy LiFePO4 batteries using embroidered current collectors

Aguiló-Aguayo

Hubmann

Khan

et al. 2020

Sci Rep

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Greater specific energy densities in lithium-ion batteries can be achieved by using three-dimensional (3D) porous current collectors, which allow for greater areal mass loadings of the electroactive material. In this paper, we present the use of embroidered current collectors for the preparation of thick, pouch-type Li-ion batteries. Experiments were performed on LiFePO 4 (LFP) water-based slurries using styrene-butadiene rubber (SBR) as binder and sodium carboxymethyl cellulose (CMC) as thickener, and formulations of different rheological characteristics were investigated. The electrochemical performance (cyclic voltammetry, rate capability) and morphological characteristics of the LFP halfpouch cells (X-ray micro computed tomography and scanning electron microscopy) were compared between the formulations. An optimum electrode formulation was identified, and a mechanism is proposed to explain differences between the formulations. With the optimum electrode formulation, 350 µm casted electrodes with high mechanical stability were achieved. Electrodes exhibited 4-6 times greater areal mass loadings (4-6 mAh cm −2) and 50% greater electroactive material weight than with foils. In tests of half-and full-pouch embroidered cells, a 50% capacity utilization at 1C-rate and 11% at 2C-rate were observed, with a full recovery at C/5-rate. The cycling stability was also maintained over 55 cycles.

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X-ray micro tomography of three-dimensional embroidered current collectors for lithium-ion batteries

Cited by 8 publications

References 26 publications

Three-dimensional embroidered current collectors for ultra-thick electrodes in batteries

Three-dimensional embroidered current collectors for ultra-thick electrodes in batteries

New Three-Dimensional Porous Electrode Concept: Vertically-Aligned Carbon Nanotubes Directly Grown on Embroidered Copper Structures

Water-based slurries for high-energy LiFePO4 batteries using embroidered current collectors

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