2004 Index IEEE Electrical Insulation Magazine Vol. 20

Arajelian, V G; Boggs, S. Whittemore; Borsi, H.; Boulter, Edward A.; Buchholz, V.; Cherney, E.A.; Cherukupalli, S.; Colwell, M; Cooper, Jacob C.; Cotton, Ian

doi:10.1109/mei.2004.1367534

Cited by 2 publications

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“…Other water-based binders, such as polymer dispersions of SBR, are typically very sensitive and unsuitable for applications with high specific energy input during dispersing [4]. Furthermore, compared to PVdF and SBR (styrene-butadiene rubber), PTFE particles form fibrils when shear stress is applied above 19 • C [15]. At 19 • C, the chain segments change from a perfect three-dimensional order to a less ordered one.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Lithium Ferro-Phosphate Cathode Manufacturing: A Semi-Dry Approach with Water-Based Processing and Polytetrafluorethylene Binders

Wiegmann,

Fischer,

Leeb

et al. 2023

Batteries

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A novel water-based lithium ferro-phosphate (LFP) cathode manufacturing process characterized by a significant reduction in the amount of solvent has been developed (semi-dry). To establish and validate this new process, Polytetrafluorethylene (PTFE) is used as a binder, with a binder content of 1 wt.%, minimizing the amount of inactive material within the electrode. Extrusion screws with multiple kneading zones stress the PTFE more intensively and thus produce more and smaller fibrils. The resulting extent of fibrillation is quantified by melting enthalpy as well as mechanical electrode properties. The degree of fibrillation of the binder in an electrode is known to influence the conductive electric and ionic pathways, which in turn affect the discharge capacity. It is shown that this process provides a flexible cathode layer that achieves a specific capacitance of 155 mAh g−1 in initial cycling tests at 0.1 C. Compared to a conventionally processed LFP cathode, the discharge capacity and overall energy output are significantly increased, and the overall energy consumption decreases for the semi-dry processed LFP cathodes.

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Section: Introductionmentioning

confidence: 99%