A method of fabricating an electrochemical energy storage cell such as a battery or supercapacitor involves positioning a portion of a fiber optic cable that includes at least one optical fiber sensor over a current collector layer. The electrode material of the energy storage cell is deposited over the current collector layer and the fiber optic cable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT
 This invention was made with government support under contract DE-AR0000274 awarded by ARPA-E (Advanced Research Projects Agency--Energy). The government has certain rights in the invention.