Molten salts (referred to as molten salts) are molten salts of molten salts. Usually, molten salts refer to the molten salts of inorganic salts, but now include oxides, melts, and molten organic compounds. The commonly used high temperature thermal storage materials can be divided into sensible heat and latent heat. Heat type high temperature heat storage material with stable performance and low price, but the accumulation of low density, large volume of heat storage device; high temperature latent heat storage materials although there are high temperature corrosion, the price is high, but its high thermal storage density, heat storage device has the advantages of compact structure, and the endothermic exothermic process - approximately isothermal, easy operation and control and management. High temperature molten salt, as one of latent heat storage phase change materials, can form ionic liquids at the same time. It has many characteristics that many low temperature thermal storage materials do not have. Therefore, high temperature molten salt has attracted great attention.

The formation of solid molten salt for most of the ionic crystals forming ion melt in high temperature melting, melt ion in aqueous solution has many different properties in the application, properties of molten salt mainly in the following aspects: (1) ion melts. Molten salts are usually composed of cations and anions, so molten salts have good electrical conductivity, and their conductivity is an order of magnitude higher than that of electrolyte solutions; (2) a wide range of temperatures. The usual molten salts are used at temperatures between 300 and -1000 DEG C with relative thermal stability; (3) low vapor pressure. Molten salts have lower vapor pressure, especially mixed molten salts; lower vapor pressure; (4) large thermal capacity; (5) higher solubility of substances; (6) lower viscosity; (7) chemical stability.