Solid-state battery having a capacitor-assisted interlayer

A rechargeable solid-state lithium ion battery cell, comprising:

• a cathode comprising a lithium-based active material capable of storing lithium;
• an anode comprising a lithium host material capable of storing lithium at a lower electrochemical potential relative to the cathode;
• a solid-state electrolyte layer disposed between the anode and the cathode;
• and
• a first capacitor assisted interlayer sandwiched between the anode and the solid-state electrolyte layer, wherein the first capacitor assisted interlayer is in intimate contact with both the anode and the solid-state electrolyte layer.

A rechargeable solid-state lithium ion battery having a plurality of battery cells, wherein at least one of the plurality of battery cells comprises:

• a cathode comprising a lithium-based active material capable of storing lithium;
• an anode comprising a lithium host material capable of storing lithium at a lower electrochemical potential relative to the cathode;
• a solid-state electrolyte layer disposed between the anode and the cathode;
• a capacitor assisted interlayer intimately sandwiched between the cathode and the solid-state electrolyte layer, wherein the capacitor assisted interlayer includes a capacitor anode active material including at least one of an activated carbon, a soft carbon, a hard carbon, a metal oxide, and a metal sulfide, and a thickness of between about 20 nanometer and about 200 micrometers.