Clad current collectors including thermal interface layer for bipolar solid-state batteries

A method for manufacturing a clad current collector for a battery cell, comprising:

• supplying a first foil layer between a first roller and a second roller, the first foil layer including copper;
• supplying a second foil layer between the first roller and the second roller, the second foil layer including aluminum;
• supplying a thermal interface layer including a polyolefin hotmelt adhesive at 25% volume, pyrolytic graphite sheets at 70% volume, and carbon nanotubes at 5% volume of the thermal interface layer;
• and
• applying heat and pressure to the first foil layer, the second foil layer and the thermal interface layer.

A clad foil current collector for a bipolar battery cells, comprising:

• a first foil layer made of copper (Cu);
• a second foil layer made of aluminum (Al);
• and
• a thermal interface layer arranged between the first foil layer and the second foil layer including:
• a hotmelt adhesive comprising polyolefin at 25% volume of the thermal interface layer;
• a first material comprising pyrolytic graphite sheets at 70% volume of the thermal interface layer;
• and
• a second material comprising carbon nanotubes at 5% volume of the thermal interface layer.