Print Email Facebook Twitter Immersion precipitation route towards high performance thick and flexible electrodes for Li-ion batteries Title Immersion precipitation route towards high performance thick and flexible electrodes for Li-ion batteries Author Harks, P.P.R.M.L. (TU Delft ChemE/Materials for Energy Conversion and Storage) Robledo, C.B. (TU Delft Energy Technology) George, C. (TU Delft RST/Storage of Electrochemical Energy) Wang, C. (TU Delft RST/Storage of Electrochemical Energy) van Dijk, Thomas (E-Stone) Sturkenboom, Leon (E-Stone) Roesink, Erik D.W. (University of Twente) Mulder, F.M. (TU Delft ChemE/Materials for Energy Conversion and Storage) Date 2019 Abstract Enabling the transition to renewable power sources requires further optimization of batteries in terms of energy/power density and cost-effectiveness. Increasing the practical thickness of Li ion battery electrodes not only can improve energy density on cell level but reduces manufacturing cost. However, thick electrodes exhibit sluggish charge-transport kinetics and are mechanically less stable, typically resulting in substandard battery performance compared to the current commercial standards (~50 μm). Here we disclose a novel method based on immersion precipitation by employing a non-solvent to solidify the battery binder, instead of solvent evaporation. This method allows for the fabrication of thick and suitable density electrodes (>100 μm with ultra-high mass loading) offering excellent electrochemical performance and mechanical stability. Using commercial electrode active materials at a remarkable mass-loading of 24 mg cm−2, the electrodes processed via immersion method are shown to deliver 3.5 mAh cm−2 at a rate of 2C and operate at rates up to 10C. As additional figure of merit, this method produces electrodes that are both stand-alone and highly flexible, which have been evaluated in flexible full-cells. Furthermore, via immersion precipitation the commonly used more toxic N-Methyl-2-pyrrolidone can be supplanted by environmentally benign dimethyl sulfoxide as solvent for processing electrode layers. Subject BatteriesElectrodesFlexible batteriesImmersion precipitationPhase inversion To reference this document use: http://resolver.tudelft.nl/uuid:9f1d6f9c-9543-4501-907e-d3c3bc9b34bd DOI https://doi.org/10.1016/j.jpowsour.2019.227200 ISSN 0378-7753 Source Journal of Power Sources, 441 Part of collection Institutional Repository Document type journal article Rights © 2019 P.P.R.M.L. Harks, C.B. Robledo, C. George, C. Wang, Thomas van Dijk, Leon Sturkenboom, Erik D.W. Roesink, F.M. Mulder Files PDF 1_s2.0_S0378775319311930_main.pdf 1.84 MB Close viewer /islandora/object/uuid:9f1d6f9c-9543-4501-907e-d3c3bc9b34bd/datastream/OBJ/view