Phase change energy storage refers to the absorption or release of energy by a substance during the phase change process, which forms the theoretical basis for the wide application of phase change energy storage materials. When phase change materials transition from liquid to solid state, they undergo a change in physical state. In these two phase transition processes, the material needs to absorb heat from the environment, and conversely, release heat to the environment. For example, 1 kilogram of 0 ° C water can be converted into 1 kilogram of 0 ° C ice, releasing 324 KJ of energy, while 1 kilogram of water increases by 1 degree and only absorbs 4.18 KJ of energy. This is the difference between sensible heat and latent heat.

Phase change energy storage materials take advantage of the high energy storage capacity and economy of inorganic salt hydrates, storing large amounts of energy in a smaller space. The aerogel phase change energy storage material can solve the two major technical problems of "phase separation" and "supercooling", so that the original phase change material can still achieve more than 77% of the energy storage energy after 300 times of phase change and more than 1000 times of phase change, extending the service life of the product by at least three times, and has obvious cost advantages compared with similar foreign "microcapsule technology". This material is an ideal energy storage material for clean energy, building energy efficiency, cold chain logistics, aerospace and military industries.