The Creative ME Storage Cell is the creative tier of item storage added by Applied Energistics 2. The Creative ME Storage Cells store and provide infinite quantities of the items you configure them to store in the Cell Workbench. Only items configured on the config can be stored/extracted.
The Creative ME Storage Cells are not intended as infinite storage, but rather as a way to generate infinite items.
As the name suggests, the Creative ME Storage Cell is not craftable in survival, and can only be obtained using creative mode/cheats.