Study on the Natural Nanofiber Separator Membranes of Li-ion Battery

• Main Authors: Wang, Yuan-Bo, 王淵博
• Other Authors: Lee, Huang-Kuei
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/ygyw78

碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 103 === A separator is an important element in a lithium-ion battery, which is used for determining the battery performance. The demand for lithium-ion batteries has significantly increased due to the rapid development of electronic products, thus triggering more research on the material applications of separators. This experiment used five basis weights of separator paper (12〖g/m^2〗, 14〖g/m^2〗, 16〖g/m^2〗, 18〖g/m^2〗, and 20〖g/m^2〗) in four different ratios of long to short fibers at 100:0, 10:90, 20:80, and 30:70 with a freeness of 300 ml using northern bleached kraft pulp (NBKP) together with laubhǒlxer bleached kraft pulp (LBKP). Using the handsheet (wet laid non-woven) technique with steps such as beating, screening, pressing, and drying, separators made of polyethylene were compared to those previously mentioned to explore their advantages and disadvantages. The study found that the fiber separator with a basis weight of 16 g or more, made from natural fiber NBKP mixed with LBKP, has excellent mechanical strength, well interwoven pores, and a unique nanopore due to its excellent resistance, electrolyte wettability, thermal properties (pyrolysis and heat shrink), smoothness, etc. Compared with commercially available polyethylene separators, natural fibers can become lithium-ion battery separators if the pores are slightly reduced.