The England Under-19 international has previously enjoyed loan spells with Wycombe and Leyton Orient and will be available for their trip to Newport on Saturday once the deal is completed on Friday morning.
"Ade is an exciting young forward who can play anywhere across the top," assistant manager Chris Brass told the club's official website.
"He has league experience after spending time on loan at Wycombe and Leyton Orient. He's got an abundance of pace and gives us something different.
"It's a good time to bring somebody into the club and we're always looking to strengthen. It should also aid his development and we're grateful to Charlton for allowing us to bring him here."