论文部分内容阅读
聚合物电解质是新一代锂离子电池所需要的重要材料．本文从分析聚丙烯腈（ＰＡＮ）－增塑剂－ＬｉＣｌＯ４体系中各组份间的相互作用出发，用Ｒａｍａｎ光谱，红外（ＩＲ）光谱，Ｘ射线光电子能谱（ＸＰＳ）及核磁共振（ＮＭＲ）等谱学方法研究了聚合物电解质中各组份之间的相互关系和Ｌｉ＋离子在聚合物电解质中的输运机理．发现Ｌｉ＋离子既可与增塑剂分子中含有孤对电子的原子发生作用而形成缔合物，也可与ＰＡＮ中Ｃ≡Ｎ基团上的Ｎ原子发生作用形成缔合物．增塑剂分子通过Ｃ＝Ｏ或Ｓ＝Ｏ基团与ＰＡＮ的Ｃ≡Ｎ基团以偶极子的形式相互排斥．在与Ｌｉ＋离子相互作用形成缔合物时，聚合物分子与增塑剂分子间存在激烈的竞争．在凝胶态中的运动是聚合物电解质Ｌｉ＋离子的主要运动形式．提出了Ｌｉ＋离子在ＰＡＮ为基的聚合物电解质中的一种可能传导机制．强调了增塑剂在聚合物电解质中的重要作用．
Polymer electrolytes are important materials for next generation lithium-ion batteries. In this paper, Raman spectroscopy, IR spectroscopy, XPS and NMR were used to analyze the interaction between the components in polyacrylonitrile (PAN) -plasticizer-LiClO4 system. The isospectral method was used to study the interdependencies among the components in the polymer electrolytes and the transport mechanism of Li + ions in the polymer electrolytes. It is found that Li + ion can form association with both atoms of lone pair in plasticizer molecule and with N atoms of C≡N group in PAN. Plasticizer molecules are mutually repellent in dipole form by the C = O or S = O groups and the C≡N groups of PAN. When interacting with Li + ions to form aggregates, there is intense competition between polymer molecules and plasticizer molecules. The movement in the gel state is the major form of movement of the Li + ions in the polymer electrolyte. A possible conduction mechanism of Li + ions in PAN-based polymer electrolytes was proposed. The importance of plasticizers in polymer electrolytes is emphasized.