Hi all, I'm currently in the works of experimenting and writing up my Extended Essay on Chemistry for the IB (it is basically a very long lab report). I have chosen to do the sub-topic of electrochemistry, within which I am interested to do something on the Lithium-ion battery. However, this topic is currently too broad. Keeping in mind this has to be related to the chemistry side of things and not physics, what kind of specifics can I possibly go into related to the Li-ion batteries? The single requirement is that it my essay must be experiment-based. Thanks for your help, Isaac.