https://wccftech.com/airpower-charging-mat-overheating-issues/

Apple announced the AirPower back in September 2017 at the launch of the iPhone X, iPhone 8, and the iPhone 8 Plus. Numerous reports started coming through stating that the accessory had been delayed to a 2018 release, but there are no updates as of yet. However, one person believes that the charging mat might not be released and gives his reasoning for that.

According to Sonny Dickson, his report states that the product is facing three major issues including overheating, charging activation issues and charging accuracy levels. Overheating is the result of the mat and its charging rates are to be affected as well. Apple is reportedly using between 21 and 24 power coils of different sizes to build the AirPower accessory. However, the challenge is to design the coil units not to overheat and interfere with one another. The structure of the coils in terms of proximity and overlap is affecting the charging ability of the device as well.