Rheologically modified slurries for electrochemical cells and components made therefrom
A method for producing a rheologically modified slurry and electrochemical cells made therefrom.
1. An electrochemical cell layer comprising:
a cathode active material;
a solid-state electrolyte; and
a rheology modifying component comprising a poly (styrene-butadiene-styrene) block copolymer (SBS),
wherein the rheology modifying component is present in an amount of less than 0.5% by weight of the electrochemical cell layer, and wherein the SBS has a butadiene content of 50% or more.
2. The electrochemical cell layer of claim 1 wherein the layer is embodied in an electrochemical cell stack, the electrochemical cell stack comprising a separator layer comprising at least one additional binder or polymer.
3. The electrochemical cell layer of claim 2 wherein the binder or polymer is at least one binder or polymer selected from the group consisting of polystyrene, polyvinylidene fluoride (PVdF), and poly (vinylene difluoride-hexafluoropropylene) copolymer (PVdF-HFP).
4. The electrochemical cell layer of claim 1 further comprising a binder or polymer, and a conductive additive.
5. The electrochemical cell layer of claim 1 wherein the cathode active material is selected from the group consisting of NMC, LiFePO 4 , LiCoO 2 , NCA, NMA, LMO, and iron sulfide.
6. The electrochemical cell layer of claim 4 wherein the conductive additive is selected from the group consisting of carbon black, graphite, graphene, VGCF, activated carbon, and carbon nanotubes.
7. The electrochemical cell layer of claim 1 wherein the layer is embodied in an electrochemical cell stack, the electrochemical cell stack comprising an anode layer comprising an anode active material, a binder or polymer, and a conductive additive.
8. The electrochemical cell layer of claim 7 wherein the anode active material is selected from the group consisting of Si, Si alloys, graphite, Sn, Li, and lithium alloys.
9. The electrochemical cell layer of claim 7 wherein the conductive additive is selected from the group consisting of carbon black, graphite, graphene, VGCF, activated carbon, and carbon nanotubes.
10. The electrochemical cell layer of claim 1 , wherein the rheology modifying component is present in an amount of about 0.25% by weight of the electrochemical cell layer.