If you carry a sharp screwdriver or stable hard knife around to puncture the battery rapidly, you may have something sort of resembling explosives, just very, VERY inefficient and unpredictably to set off. You'd be a lot better off using that screwdriver or knife instead to do whatever you'd wanna do with an exploding phone.
Can confirm. Watching 50 Shades of Greek told me way too many aspects of the Greek mythology. The Intro alone sums it up perfectly.