Stacked electrochemical cell with increased energy density

An electrochemical cell assembly, comprising:

• a first cell;
• and
• a second cell;
• the first cell comprising:
• a first anode and a first cathode, wound in a first jellyroll assembly with a first jellyroll assembly exterior defined by the first anode, a portion of the first anode extending along one or more turns of the first jellyroll assembly;
• the second cell comprising:
• a second anode and a second cathode, wound in a second jellyroll assembly with a second jellyroll assembly exterior defined by the second cathode;
• the first cell and the second cell arranged in a housing with the first jellyroll assembly exterior adjacent to the second jellyroll assembly exterior at a cathode to anode abutment;
• the first anode comprising electrochemically active material disposed on an area of the first jellyroll assembly exterior;
• the second cathode comprising another electrochemically active material selectively disposed on a portion of the second jellyroll assembly exterior;
• and
• the area of the first jellyroll assembly exterior being greater than the portion of the second jellyroll assembly exterior.

A method of manufacturing an electrochemical cell assembly, comprising:

• selectively depositing an electrochemically active material on a current collection layer to obtain a first cathode;
• forming a first jellyroll assembly from the first cathode, a first anode, and a first separator, the first jellyroll assembly including a first exterior defined by the first cathode, a portion of the first cathode extending along one or more turns of an interior of the first jellyroll assembly, the first exterior including the electrochemically active material deposited only on a portion of the first exterior;
• forming a second jellyroll assembly from a second cathode, a second anode, and a second separator, the second jellyroll assembly including a second exterior defined by the second anode, the second exterior having an additional electrochemically active material disposed on an area of the second exterior;
• and
• disposing the first jellyroll assembly and the second jellyroll assembly in a housing with the portion of the first exterior adjacent to the area of the second exterior at a cathode to anode abutment, the area of the second exterior being greater than the portion of the first exterior.