German colleges and universities assess the challenges and requirements of the total solid-state battery, proposed processing chain treatment method

Автор: Iflowpower – Kannettavien voimalaitosten toimittaja

Germany Munich University (TUM) and the researchers of the Helmholtz Institute (HIU), the Ulm University, assess the challenges and requirements of the large-scale machining of all solid-state lithium ions and lithium metal batteries. They report their research results to experts from research institutions, materials suppliers and automakers. In order to narrow the gap between materials research and industry large-scale machining, the team proposes a process chain treatment of sulfide and oxide-based full solid state batteries (ASSB) from electrodes to battery packaging and quality control.

The researchers made a specific comparison of the processes of the sulfide-based full solid state battery and conventional lithium ion battery, and declare, although the composite electrode manufacturing process can be adjusted by some techniques, but the manufacturing of the solid electrolyte isolation layer and the integration of the lithium metal anode Will be a new process. Although there is currently general existence in consumer electronics, industrial and automotive use, there are many problems in conventional lithium-ion batteries, including raw materials availability, security issues, and limited energy storage capacity. Schnell, researchers, said: "In order to meet the requirements of car use in 2025, 800WH / L will be 800Wh / L, and more than 300WH / kg is more than energy.

"Conventional lithium-ion battery consists of two electrodes, partitions, and tightness consisting of liquid electrolyte composed of non-militant organic solvents and conductive salts. Researchers said that many problems currently in the face of lithium-ion batteries can be traced back to this liquid electrolyte. The flammability of the solvent causes the safety problems and side reactions of the battery, and the conductive salt causes the decay and aging of the battery capacity.

During battery processing, the electrolyte filling and wetting process and a wide range of molding processes. In contrast, due to the lack of flammable components, the full solid state battery is essentially more secure, and can significantly improve the energy density. The full solid state battery is used instead of the liquid electrolyte, which can be used as an electrical insulator and as an ionic conductor.

SolidPhysicalBarrier can also use lithium metal as an anode material by the formation of alert branch crystal. Therefore, its volumetric energy density can be added up to 70% compared to conventional graphite batteries. Further, the electrochemical stability of the solid electrolyte can cause high capacity (such as sulfur) or high voltage cathode materials.

Overall, research statements, although the continuous improvement and development of the material level should be made to cope with the challenge of battery interface stability and electrical conductivity, the future research is not more important to material and processing costs, so that it can quickly invest in the market. .