HomeReadiphone-battery-chemistry-explainedTechnicaliPhone Battery Chemistry Explained: Why Lithium-Ion DegradesLiCoO₂ cathodes, graphite anodes, SEI layer growth, and why 500 cycles means 80% capacity. The science of iPhone batteries made accessible.ccelltech TeamExpert TechniciansUpdated February 7, 20269 min readVerified February 2026Was this article helpful?YesNoPreviousGuidesiPhone Battery and Cold Weather: A UK Winter GuideNextGuidesiPhone Battery Replacement vs New Phone: The Cost AnalysisFound this helpful? Share it: