An Illumination Power Hub Tag for charging Phones

Hey Freelancers. I want a illuminated battery power bank Tag to be developed which will be attached at the back of the phone. HOW IT WILL WORK? It will be a kind of power hub in which power will be stored. When the user charges it's phone from wall charge, at that time, this tag can be applied at the back of the phone. This tag gets charged by your phone's battery wirelessly. Once charged, it will be applied on the back of the phone and it will act as a power hub and will provide charging to the phone wirlessly when needed. All this will be controlled by an App. But its main features will be 1) It will be ultra thin. 2) It will also support fast charging 3) It will also have a high efficiency so that it could power your phone for a long time. (I've provided a sample image of how it will look)