A few days ago, the "high specific energy, large capacity lithium-sulfur secondary battery and battery pack" with independent intellectual property rights developed by the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences (hereinafter referred to as "Dalian Institute of Chemical Physics") was approved in Beijing by the China National Light Industry Council. Appraisal of scientific and technological achievements organized by the organization. The appraisal opinion is: the overall technology of the project has reached the international advanced level, and the energy density has reached the international leading level.

  Specific energy is the energy released by a battery per unit weight or unit volume, and is an important performance indicator of a battery. Lithium-sulfur battery is a high-specific-energy secondary battery with abundant raw material reserves, environmental friendliness, and low cost. It is also the next-generation secondary battery technology that is closest to practical use. However, elemental sulfur is an insulating material, the electrode has low reactivity and is easily lost, and the relative lack of battery engineering technology seriously hinders the practical application of this battery.

  In recent years, the research team led by Dalian Institute of Chemical Physics researcher Chen Jian has overcome a series of lithium-sulfur battery engineering technical problems, successively developed high-performance battery key materials and key components, and developed high-capacity lithium-sulfur battery and battery pack technology.

 The third-party test report shows that the specific energy of the 35Ah battery developed by the research group reached 566Wh/kg (measured at 25°C), the specific energy of the 39Ah battery reached 616Wh/kg (measured at 50°C), and the specific energy of the 1kWh lithium-sulfur battery pack reached 332Wh/kg. This is the lithium-sulfur battery and battery pack with the highest specific energy in the world so far. At the same time, the high-capacity lithium-sulfur battery has passed the third-party safety performance test using the electric vehicle power battery standard.

  Recently, the research group has made important progress in the practical application of batteries, developed my country's first 12kWh lithium-sulfur battery-photovoltaic battery joint demonstration system with independent intellectual property rights, and successfully operated it. The practical application in power stations, vehicle power supplies and other fields has laid a technical foundation.