The iPhone is such a tiny object that there isn't much space for anything, especially thick or heavy heat sinks. Graphene is an excellent material for
a heat sink because it has ten times more thermal conductivity than copper.
The iPhone has no fan, so heat has to be dissipated through the device
frame into the air using passive heat transfer. Heat sinks do precisely
what the name implies, they remove heat from undesirable areas by having a
more efficient thermal conduction value than the materials around it.
Graphene would perform better than the existing cooling mechanism, thus allowing the iPhone to deal with more heat more efficiently.
Apple is actively working on graphene thermal system of iPhone 16 Series to solve the heating problem existing before. And the battery of Pro series
would change to metal shell, for the same reason.
-- Kosutami (@KosutamiSan)
https://appleinsider.com/articles/23/11/16/iphone-16-to-use-graphene-heat-sink-to-solve-overheating-issues
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