The Nairobi-based African Economic Research Consortium (AERC) has produced in recent years a mother lode of studies on China's economic relations with individual African countries. AERC is a public, non-profit organization devoted to the advancement of economic policy research and training. It receives funding from donor governments, private foundations, and African and international organizations.
The focus of the studies is generally aid, trade and investment but they sometimes cover issues of governance. Most of the reports are in English; a few are in French. There are multiple reports for some countries and some reports cover general aspects of China's economic relations with Sub-Saharan Africa.
AERC has studied the following countries so far: Kenya (2), Angola (6), Namibia, Zimbabwe, Cameroon (3), Gambia, Tanzania, Ethiopia (2), Sudan (4), Ghana (2), Nigeria (3), Uganda (3), Zambia (2), Mauritius (5), Madagascar (3), Republic of the Congo (2), Mali (2), Guinea, Chad, Cote d'Ivoire, and South Africa.
You can download the studies by going to the index here.