Explore l Learn l Facts on Instagram: "what’s really inside your phone battery? (don’t try this at home!) inside every smartphone battery — typically a lithium-ion type — lies a complex structure of tightly packed chemical layers. these include a positive cathode made of lithium cobalt oxide, a negative anode made of graphite, and a separator soaked in an electrolyte solution that allows lithium ions to move back and forth during charging and discharging. when the battery is charged, ions flow o