| 摘要: | 隔離膜為鋰離子電池組成材料中重要的元件，其性質優劣決定了電池使用上的性能，而隨著相關電子產品的快速發展，鋰離子電池的需求量也大增，同時帶動了隔離膜在材料應用上的研究。
本實驗將以手抄紙(濕式不織布)技術，使用針葉樹漂白牛皮紙漿[簡稱NBKP]為主要材料並搭配闊葉樹漂白牛皮紙漿[簡稱LBKP]，經打漿、抄造、烘乾等步驟，採用游離度300ml 抄造出五種基重(12〖g/m^2〗、14〖g/m^2〗、 16〖g/m^2〗、18〖g/m^2〗、20〖g/m^2〗)，四種長纖維(NBKP)與短纖維(LBKP)漿料配比分別為100:0、10:90、20:80、30:70之隔離膜紙張做測試。並取其與聚乙烯製成之隔離膜做比較，探討兩者之優缺點。
經研究發現，基重16克以上天然纖維NBKP混合LBKP所抄造之纖維隔離膜擁有優良的機械強度以及較佳之交織孔洞、並因其本身特有的奈米壁孔與優異之電阻、電解液潤濕性、熱性質(熱裂解與熱收縮)、平整性等。在與市面之聚乙烯隔離膜比較下，若能改進孔洞略大的缺點，天然纖維應有機會被抄造成鋰離子電池隔離膜的。
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. |
