【作者】 包健；

【导师】 官建国；

【作者基本信息】 武汉理工大学 ， 材料学， 2004， 硕士

【摘要】 本文设计合成了两种不同的聚合物固体电解质：聚乙二醇／SiO₂固体电解质和聚乙二醇单甲醚／SiO₂固体电解质。用红外光谱、扫描电镜、透射电镜、X射线衍射、热重—差热等测试方法对固体电解质膜进行表征。用DDS—11A型离子电导率仪对固体电解质膜进行离子电导率测量。 对聚乙二醇／SiO₂电解质膜，正硅酸乙酯水解产生的无机SiO₂粒子通过化学键的作用与聚合物基体结合形成了交联结构，使得聚合物电解质具有比较好的热稳定性。随温度升高，固体电解质的离子电导率出现最大值。离子电导率与PEG与HDI的比值有关，当两者比值为1：2时，离子电导率最高。离子电导率随着固体电解质中聚乙二醇链段长度增加而出现最大值，此时链段长度为800。 前驱体和正硅酸乙酯（TEOS）在酸性条件下水解得到聚乙二醇单甲醚／SiO₂电解质溶液的SiO₂，粒径范围比较大，并形成了外层为聚合物，内层为SiO₂的具有核壳结构的粒子，正硅酸乙酯加入量越多，则其粒子容易发生团聚。正硅酸乙酯在酸性条件下水解形成无机SiO₂粒子后，得到的固体电解质膜呈非晶态，无机SiO₂破坏了聚合物的结晶。离子电导率随着温度升高而增加，因为温度升高有利于离子迁移。离子电导率随固体电解质中聚乙二醇单甲醚分子链段增加而增加。随着TEOS加入量增多，离子导电率增加，但是过量的TEOS会导致离子电导率下降。在不加入TEOS情况下，锂离子也可能通过Si-O-Si键中的氧来传递，离子电导率较大。随着高氯酸锂用量的增加，离子电导率出现最大值，此时高氯酸锂与聚乙二醇单甲醚中EO单元摩尔比为1：5。更多还原

【Abstract】 In this dissertation,two kinds of Poly(ethylene glycol)/SiO2 solid electrolyte and methoxy Poly(ethylene glycol)/Si02 solid electrolyte were designed and sythesized. The structure of hybrid solid electrolytes were characterized by FT-IR, SEM, TEM. XRD, TG-DSC etc.. The ionic conductivity(σ ) of the solid electrolyte membrane was measured with Model DDS-11A conductor.For Poly(ethylene glycol)/SiO2 solid electrolyte membrane , Polymer solid electrolyte membrane had good heat resistance because inorganic SiO2 particles had a chemical bond with the polymer, σ showed a maximum conductivity with increasing of temperature, σ reached the highest at PEG/HDI of 1:2. The hybrid solid electrolyte showed a maximum value when the segments of Poly(ethylene glycol) were 800.The diameter distribution of core-shell SiO2 particles in the acid environment synthesized by sol-gel reaction were not uniformly. If the amount of TEOS used was abundant, SiO2 particles aggregated. SiO2 particles destroyed the crystallization of polymer,and the membrane was amorphous, σ increased as temperature rised, because the Li+ could move easily, σ rised with the rising of segments of methoxy Poly(ethylene glycol) . σ rised when the amount of TEOS increased, but too much TEOS added result in a lower conductivity. Without TEOS, σ was relatively higher for Li+ might transmit through oxygen in Si-O-Si bond. Conductivity rised with the increasing of [Li+]/[EO] till the proportion of [Li+]/[EO] was 1:5.更多还原