What are mobile phone batteries made of?

Your mobile phone battery operates your phone by essentially conducting an chemical reaction. The chemical reaction is continuously running and when the chemical reaction stops, your phone goes dead (as all of us have experience at one point or another).

Mobile phones use a lithium-ion battery which has a positive and negative terminal that supply power to our phones. The flow of electrons between the positive and negative terminals creates electricity. But what actually causes this flow of electrons? In a lithium ion battery, the electrons come from the element lithium. At the negative terminal or anode, lithium is stored between layers of carbon graphite. Lithium is a unique element in that it wants to shed its electrons. At the positive terminal or cathode, cobalt is stored and wants to gain an electron. In most lithium ion batteries, the cathode made of a cobalt, nickel, manganese or iron mix. As a result, the flow of electrons between the anode and cathode begins as lithium wants to release electrons and cobalt wants to accept electrons.

A layer of a lithium salt electrolyte is disposed between the anode and the cathode which allows lithium atoms to pass through but not the electrons. These lithium atoms become lithium ions as they pass through the electrolyte layer. But as the lithium atoms continue to leave the anode and migrate through the electrolyte layer, the amount of lithium becomes depleted and your phone begins to die since the amount of lithium electrons are slowly disappearing.

At some point, your mobile phone battery can only be re-charged so many times and you will need to buy a new battery.  MobilePhone.asia has a wide assortment of mobile phone batteries for many different brands which can be found here.