No African nation uses the Kuwaiti Dinar (KWD) as its official currency. The Kuwaiti Dinar is exclusively the legal tender of the State of Kuwait, a country located in Western Asia at the tip of the Persian Gulf.
African countries use their own sovereign currencies or regional shared currencies:
The Kuwaiti Dinar is the world's highest-valued currency unit (1 KWD ≈ 3.25 USD), which may cause mistaken assumptions about its international use. However, it circulates only in Kuwait and is not legal tender elsewhere.
If you're traveling to Africa, you'll need the local currency of your destination country.