Lithium ion batteries have been developed for over 30 years since their first industrialization and have gradually become the mainstream battery technology in fields such as electronic devices, mobile communications, and electric vehicles.

However, it cannot be ignored that due to the solid-liquid interface of its electrolyte, a series of problems are prone to occur during the circulation process. For example, the growth of lithium metal dendrites, the formation of electrolyte films, and the electrochemical reactions inside the battery can lead to performance degradation and short circuits, limiting the cycle life and safety of the battery.

Recently, a team led by Professor Li Xin from Harvard University in the United States has innovatively proposed a new method to prepare solid-state lithium batteries using lithium metal as the negative electrode material.

This method not only effectively suppresses the dendritic growth of lithium metal and the growth of electrolyte interface reaction layer, but also significantly improves the cycling stability, energy and power density, and safety of the battery.

This battery achieved a capacity of 80% after 6000 cycles under a current of 10 milliamperes, and its performance is significantly higher than other soft pack batteries on the market today.

The team demonstrated the coating process of soft pack batteries, which has advantages for scaling up to larger capacity batteries in the future. The research group has produced a soft pack battery with an area more than 10 times that of a button battery, about the size of a postage stamp.