You Do Need power plug adapter while traveling from Saint Kitts and Nevis to Mali.

Here is Why You Need An Adapter

The outlet and plug type used in Mali are C and E and in Saint Kitts and Nevis are D and G. This is how they look like.

Saint Kitts and Nevis

In Saint Kitts and Nevis, outlets of type D and G are in use.

Type D

Type G

Mali

In Mali, outlets of type C and E are in use.

Type C

Type E