Binders for wet and dry lamination of battery cells

A cell stack for a battery cell, comprising:

• a cathode comprising a cathode active material disposed on a cathode current collector;
• an anode comprising an anode active material disposed on an anode current collector, the anode oriented towards the cathode such that the anode active material faces the cathode active material;
• a separator disposed between the cathode active material and the anode active material and comprising a blended binder comprising a first PVdF-HFP copolymer and a second PVdF-HFP copolymer;
• and
• wherein first PVdF-HFP copolymer has a first molecular weight greater than or equal to 1,000,000 u and a first weight percent of HFP less than or equal to 7 percent, and
• wherein second PVdF-HFP copolymer has a second molecular weight from 500,000 to 1,000,000 u and a second weight percent of HFP from 10 to 15 percent.

A method for laminating at least one cell stack of a battery cell, the method comprising:

• contacting a separator with a first active material of a first electrode to form a first cell stack, the separator comprising a blended binder comprising a first PVdF-HFP copolymer and a second PVdF-HFP copolymer;
• heating the first cell stack to laminate the separator to the first electrode;
• and
• wherein first PVdF-HFP copolymer has a first molecular weight greater than or equal to 1,000,000 u and a first weight percent of HFP less than or equal to 7 percent, and
• wherein second PVdF-HFP copolymer has a second molecular weight from 500,000 to 1,000,000 u and a second weight percent of HFP from 10 to 15 percent.