The solar thermal power generation is of great significance to alleviate the shortage of fossil energy and reducing carbon emissions

while large-scale high-temperature thermal storage is the key to solar thermal power generation. Thermochemical energy storage has broad application prospects in the field of solar thermal power generation due to its high energy storage density. In this paper

the basic principles and characteristics of thermochemical energy storage are reviewed. Several promising thermochemical energy storage systems and their research status are introduced in this paper

including metal hydride energy storage system

carbonate energy storage system

hydroxide energy storage system and metal oxide energy storage system. The existing problems of various energy storage systems are also summarized. Finally

the future research direction of thermochemical energy storage is also pointed out based on the existing problems.