![]() ![]() The separator itself may be a polymer, such as a microporous film of polyethylene (PE) or polypropylene (PP) thus, even when the cell has a liquid electrolyte, it will still contain a "polymer" component. Ī typical cell has four main components: positive electrode, negative electrode, separator and electrolyte. In 1996, Bellcore in the United States announced a rechargeable lithium polymer cell using porous SPE. From 1990 several organisations like Mead and Valence in the United States and GS Yuasa in Japan developed batteries using gelled SPEs. The dry SPE was the first used in prototype batteries, around 1978 by Michel Armand, and 1985 by ANVAR and Elf Aquitaine of France, and Hydro-Québec of Canada. The solid electrolyte can typically be classified as one of three types: dry SPE, gelled SPE and porous SPE. ![]() In the 1970s the original polymer design used a solid dry polymer electrolyte resembling a plastic-like film, replacing the traditional porous separator that is soaked with electrolyte. The primary difference is that instead of using a liquid lithium-salt electrolyte (such as LiPF 6) held in an organic solvent (such as EC/ DMC/ DEC), the battery uses a solid polymer electrolyte (SPE) such as poly(ethylene oxide) (PEO), poly(acrylonitrile) (PAN), poly(methyl methacrylate) (PMMA) or poly(vinylidene fluoride) (PVdF). Lithium polymer cells have evolved from lithium-ion and lithium-metal batteries. After that, other packaging forms evolved, including the flat pouch format. LiPo cells follow the history of lithium-ion and lithium-metal cells which underwent extensive research during the 1980s, reaching a significant milestone with Sony's first commercial cylindrical Li-ion cell in 1991. Main article: Lithium-ion battery § History ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |