Development of solid polymer polyelectrolyte based on carbonate oligomer

用于锂离子二次电池的有机溶剂电解液存在液体泄漏或爆炸的危险。有许多研究通过关注粘度或化学结构来增加电导率。然而，支化聚合物对锂离子扩散系数的影响没有被揭示。因此，我们研究了电导率和分子量或支化结构的PC-二醇之间的关系。电导率随分子量的减小或温度的降低而增大。 支化聚合物和星星型聚合物的电导率和粘度低于或高于线型聚合物。电导率和粘度与分子量的变化和分支的引入不成正比。 计算σ-η值以消除粘度对σ值的影响。 结果表明，高分子量的PC-乙二醇和支链PC-乙二醇表现出较大的数量级。看来，这些影响的离子跳跃的容易程度。

The organic solvent electrolyte for lithium ion secondary battery has the danger of liquid leaking or explosion. There are many studies to increase the conductivity by focus on viscosity or chemical structure. However, the effect of branched polymer on the diffusion coefficient of lithium ions was not revealed. Thus, we investigated the relationship between conductivity and molecular weight or branched structure of the PC-glycols. The conductivity increased with a decrease of molecular weight or decrease of temperature. Conductivity and viscosity of branched and star polymer was lower or higher than that of linear polymer. Conductivity and viscosity was not proportional to the change of molecular weight and introduce of branch. The sigma-eta value was calculated in order to cancel the viscosity effect on the sigma value. As the results, the high molecular weight-PC-glycol and branched one exhibited larger magnitude. It seems that these effects influenced the ease of ion hopping.