This book describes the design, synthesis, performance and practical application of energetic materials. The book consists of thirteen chapters demonstrating the design routes of nitrogen-rich polycyclic-based energetic materials that are bicyclic, tricyclic and tetracyclic-based. It presents the synthesis of the energetic backbone, the construction of linkage and the introduction of energetic units, which could have a positive impact on the chemistry of not only on high-energy-density materials but also in other fields. The book also provides detailed analysis of the experimental methods discussed. Work in this area will benefit from the combine expertise from organic, inorganic and physical chemistry as well as other connected disciplines. As such this book has wide appeal and will help in increasing fundamental knowledge of nitrogen-rich heterocycles to eventually allow for this knowledge to be transferred into industrial applications.