Phase change energy storage refers to the absorption or release of energy by substances during phase change. It is this characteristic that forms the theoretical basis for the wide application of phase change energy storage materials. Phase change materials undergo a change in physical state when they transition from liquid to solid. During these two phase changes, the material absorbs heat from the environment and, conversely, releases heat to the environment. For example: 1 kilogram of 0°C water becomes 1 kilogram of 0°C ice, which can release 324KJ of energy, while 1kg of water rising by 1 degree absorbs only 4.18KJ 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 to store a large amount of energy in a small space. Airgel phase change energy storage materials can solve the two major technical problems of "phase separation" and "supercooling", so that the original phase change material needs to be replaced after 300 phase changes, and can still store energy after more than 1,000 phase changes. It can reach more than 77%, extending the service life of the product by at least 3 times, and has obvious cost advantages compared with similar foreign "microcapsule technology". This material is an ideal energy storage material in the fields of clean energy, building energy conservation, cold chain logistics, aerospace and military industry.