文章摘要
多孔性纤维素无纺布增强聚合物隔膜的制备
Preparation of Cellulose Nonwoven-Supported Porous Polymer Membranes for Lithium-Ion Batteries
  
DOI:10.16865/j.cnki.1000-7555.2018.02.023
中文关键词: 锂离子电池  隔膜  凝胶聚合物  纤维素纺布
英文关键词: lithium-ion batteries  membrane  gel polymer  cellulose nonwoven
基金项目:江苏省自然科学基金面上项目(BK20151263);江苏省高校优势学科建设工程(PAPD)
作者单位
胡健康,顾陆铭,张明祖,何金林,倪沛红 苏州大学 材料与化学化工学部 江苏省先进功能高分子材料设计及应用重点实验室 苏州市大分子设计与精密合成重点实验室,江苏 苏州 215123 
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中文摘要:
      以聚乙二醇单甲醚甲基丙烯酸酯(PEGMEMA)为单体,八乙烯基多面体齐聚倍半硅氧烷(OVPOSS)为交联剂,通过紫外光照引发聚合,形成交联结构,并与线型聚偏氟乙烯-六氟丙烯共聚物(PVdF-HFP)形成一种新型的凝胶聚合物隔膜。为了进一步提高聚合物膜的力学强度和电化学性能,用纤维素纺布和致孔剂对其改性。实验结果表明,改性后隔膜的力学性能、离子电导率和孔隙率都得到明显的提高,拉伸强度最高达到10.6 MPa。与商用聚乙烯膜、单一的PVdF-HFP多孔膜和未用纺布改性的隔膜比较,聚合物改性后的隔膜在150 ℃仍可以保证尺寸稳定。采用改性隔膜组装的锂离子电池拥有更好的循环和倍率放电性能,在0.5C/0.5C的充放电条件下能够稳定循环,最高放电比容量可达到145mA·h/g。
英文摘要:
      A novel gel polymer membrane was prepared by blend of linear poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) and crosslinked polymer derived from poly(ethylene glycol) methyl ether methacrylate (PEGMEMA) and octaviny-T8-silsesquioxane (OVPOSS) using UV-induced technology. In order to enhance mechanical strength and electrochemical performances, the membrane was modified with cellulose nonwoven and pore-forming agent. The results demonstrate the tensile strength, ionic conductivity and electrolyte uptake of the modified membranes are obviously improved, and the largest tensile strength of the modified membranes reaches 10.6 MPa. The modified membranes exhibit enhanced thermal stability and remain dimensional stability after exposure to 150 ℃. Meanwhile, the cells assembled with modified membranes display better cycle performance and C-rate capability than the other membranes, and the highest discharge capacity reaches 145 mA·h/g under the constant current mode at 0.5 C/0.5 C.
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