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Teardown: A peek inside iPhone 6 Plus battery

Posted: 15 Jun 2015     Print Version  Bookmark and Share

Keywords:lithium-polymer  batteries  smartphone  iPhone 6 Plus  Apple 

The image below is a cross section taken through the iPhone 6 Plus battery showing its layered structure. The battery contains 11 cathode (positive battery terminal) and 10 aluminum anode (negative battery terminal) current collector layers that are connected in parallel. The anode and cathode collector electrodes are coated with their electrode respective active layers and then stacked one on top of the other. Separator layers are inserted between the anode and cathodes to prevent short circuits but at the same time allows for the transfer of lithium ions between the anode and cathodes.

iPhone 6 Plus battery in cross section

iPhone 6 Plus battery in cross section. (Source: Detailed Structural Analysis of the Apple iPhone 6 Plus Li-ion Polymer Battery, TechInsights)

The image below shows the edge of the battery where the cathode current collector layers are brought and welded together to form the battery's anode battery terminal. The anode current collectors are brought out of the package in a similar fashion.

Cathode battery terminal

Cathode battery terminal. (Source: TechInsights)

From TechInsights' Detailed Structural Analysis report, we know that the iPhone 6 Plus battery uses lithium cobalt oxide (LiCoO2) for the cathode and graphite for the anode as shown below.

SEM cross section iPhone 6 battery

SEM cross section iPhone 6 battery. (Source: Detailed Structural Analysis of the Apple iPhone 6 Plus Li-ion Polymer Battery, TechInsights)


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