發(fā)布時間：2018-05-26 08:31

  本文選題：聚環(huán)氧乙烷 + 全固態(tài)聚合物電解質��； 參考：《沈陽工業(yè)大學》2017年碩士論文

【摘要】：固態(tài)聚合物電解質用來制備全固態(tài)高能密度的可充電式鋰離子電池,因其具有質量輕、柔順度好、彈性好、易成膜以及有較好的導電性等特點。固態(tài)的聚合物電解質的電導率雖然沒有液態(tài)電解質的電導率高,但具備易成膜,壽命長,適合各種各樣的形狀等優(yōu)點,所以固態(tài)聚合物電解質膜成為最近鋰離子電池工業(yè)化應用研究的熱點。在過去的30年里,人們雖然一直在研究固態(tài)聚合物電解質,并且聚環(huán)氧乙烷(PEO)是研究最早最多的,被認為是比較理想的聚合物電解質,但電導率低,仍然是未解決的問題。液晶離聚物(LCI),既有液晶的性能又有離子的性能,采用原位界面聚合方法制備出LCI/PEO固態(tài)聚合物電解質,研究聚合物電解質各組分的含量以及反應條件對產量產率的影響,通過IR、透射電鏡、交流阻抗對電解質結構、形貌和導電性進行表征。結果表明,PEO含量增大使LCI/PEO固態(tài)聚合物電解質的產率下降,電導率隨PEO含量的增加先增加后降低,在PEO與液晶離聚物質量比為0.8時,電解質的電導率達到最大值,為2.65×10-6S/cm;對于鋰鹽含量的改變對LCI/PEO固態(tài)聚合物電解質的產率無明顯影響,電解質的電導率隨鋰鹽含量的增加而減少,在其含量為5%時,電解質的電導率達到最大值,為2.65×10-6S/cm,而后因離子間庫侖力作用增強,抑制離子的移動,電解質的電導率下降。制備液晶離聚物/蒙脫土(LCI/MMT)雜化材料,研究以PEO和聚甲基丙烯酸甲酯(PMMA)為基體,添加LCI/MMT雜化材料作為增容劑來制備聚合物電解質膜,得出成膜工藝的最佳條件:PEO:PMMA的質量比為7:3,LiClO4的添加量為0.004g/mL,轉速攪拌為700rmp,時間4h,刮膜后50℃烘干2h。通過掃描電鏡(SEM)、熱重分析(DSC/TGA)、交流阻抗(AC)等研究表明LCI/MMT雜化材料的加入提高了聚合物電解質膜的相容性和電導率,在LCI/MMT納米雜化材料含量1.01%時電導率最高為9.86×10-6 S/cm,由于LCI/MMT雜化材料的加入,使PEO相的結晶度降低,電導率升高,熱性能增加,在0到300之間熱穩(wěn)定性良好,沒有發(fā)生分解。
[Abstract]:Solid polymer electrolytes are used to prepare rechargeable lithium-ion batteries with all-solid-state high energy density due to their advantages of light weight, good flexibility, good elasticity, easy film formation and good electrical conductivity. Although the conductivity of solid polymer electrolyte is not as high as that of liquid electrolyte, it has the advantages of easy film formation, long life, suitable for various shapes, etc. Therefore, solid polymer electrolyte membrane has become a hot spot in the industrial application of lithium ion batteries. In the past 30 years, people have been studying solid polymer electrolyte, and PEO is the earliest and ideal polymer electrolyte, but the conductivity is low, it is still an unsolved problem. LCI/PEO solid polymer electrolytes were prepared by in situ interfacial polymerization with liquid crystal ionomer and ionic properties. The effects of the content of polymer electrolyte components and reaction conditions on the yield were studied. The structure, morphology and conductivity of the electrolyte were characterized by IR, TEM and AC impedance. The results show that the yield of LCI/PEO solid polymer electrolyte decreases with the increase of PEO content, and the conductivity increases first and then decreases with the increase of PEO content. When the mass ratio of PEO to liquid crystal ionomer is 0. 8, the conductivity of the electrolyte reaches the maximum. The conductivity of LCI/PEO solid polymer electrolyte decreased with the increase of lithium salt content, and the conductivity reached the maximum when the content of lithium salt was 5%, and the content of lithium salt was 2.65 脳 10 ~ (-6) s / cm, and there was no significant effect on the yield of solid polymer electrolyte with the change of lithium salt content, and the conductivity of electrolyte decreased with the increase of lithium salt content. It is 2.65 脳 10 ~ (-6) S / cm, but the ionic conductivity decreases due to the enhancement of the interaction between ions and the inhibition of ion movement. Liquid crystal ionomer / montmorillonite LCI / MMT hybrid materials were prepared. Polymer electrolyte membranes were prepared using PEO and PMMA as matrix and LCI/MMT hybrid materials as compatibilizer. The optimum conditions of the film forming process were obtained: the mass ratio of 1: PEO: PMMA was 7: 3, the addition of LiClO4 was 0.004g / mL, the stirring speed was 700rmpand the time was 4h, and the film was dried at 50 鈩，

本文編號：1936558