發(fā)布時(shí)間：2018-09-08 07:32

【摘要】：為改善鋰電隔膜的親液性和耐高溫性,以醋酸纖維素為成膜材料,利用相轉(zhuǎn)化法制備了新型鋰電隔膜,通過(guò)形貌和孔道結(jié)構(gòu)表征、親液性能和耐熱性能測(cè)試對(duì)醋酸纖維素隔膜的基本性能進(jìn)行研究,并將該隔膜裝配成鋰離子電池進(jìn)行充放電性能測(cè)試.結(jié)果表明,醋酸纖維素隔膜具有均勻的微孔結(jié)構(gòu),孔隙率達(dá)到65%,約為傳統(tǒng)聚烯烴隔膜的1.5倍;纖維素材料的良好親液性和高孔隙率結(jié)構(gòu)改善了隔膜的吸液性能,其吸液率達(dá)到285%;該隔膜在150oC、30 min的熱處理?xiàng)l件下未發(fā)生明顯的熱收縮.鑒于上述優(yōu)點(diǎn),相對(duì)于市售PE隔膜,醋酸纖維素隔膜所裝配鋰離子電池顯示出更優(yōu)的循環(huán)性能和倍率性能.
[Abstract]:In order to improve the hydrophilicity and high temperature resistance of lithium electric separator, a novel lithium electric separator was prepared by phase inversion method with cellulose acetate as membrane material, and characterized by morphology and pore structure. The basic properties of cellulose acetate membrane were studied by hydrophilic and heat resistance tests. The membrane was assembled into a lithium ion battery to test its charge-discharge performance. The results showed that cellulose acetate membrane had a uniform micropore structure with a porosity of 65, about 1.5 times of that of the traditional polyolefin membrane, and the good hydrophilic property and high porosity structure of cellulose improved the liquid absorption performance of the membrane. The absorbency of the film reached 285, and the membrane did not show obvious thermal shrinkage under the heat treatment condition of 150oC ~ (3 +) for 30 min. In view of the above advantages, the lithium-ion batteries fitted with cellulose acetate membranes exhibit better cycling performance and rate performance than commercial PE membranes.
【作者單位】： 山西大同大學(xué)煤炭工程學(xué)院礦業(yè)工程系;
【基金】：大同市科技資助項(xiàng)目(No.201316) 山西省科技資助項(xiàng)目(No.20140321003-05)資助
【分類號(hào)】：TM912

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1 王妍妍;直孔電極和多孔銅集流體的溶液相轉(zhuǎn)化法制備與表征[D];中國(guó)科學(xué)技術(shù)大學(xué);2017年

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本文編號(hào)：2229826