【摘要】：凝膠聚合物電解質(GPE)具有無液體泄漏、柔性、結構簡單、環(huán)保等優(yōu)點,在儲能器件中具有較好的應用價值和前景。聚(N-乙烯基吡咯烷酮)(PVP)是一類較好的水溶性聚電解質基體材料,且單體易于改性、合成簡便。共聚和共混是提高GPE離子電導率和機械強度的有效的方法。以N-乙烯基吡咯烷酮和對苯乙烯磺酸鈉為共聚單體,采用自由基溶液聚合的方法制備聚(N-乙烯基吡咯烷酮-co-對苯乙烯磺酸鈉)即P(NVP-co-SSS)基GPE。通過探究引發(fā)劑用量、交聯(lián)劑用量、溫度、單體配比等因素對膜的吸液率和離子電導率的影響,得到在引發(fā)劑用量為1.5 wt.%,交聯(lián)劑用量為1.0 wt.%,溫度為70 ℃,單體配比為2:1時,膜的綜合性能最佳,其膜吸水率為18.57 g·g-1,離子電導率為3.58×10-3S/cm。相比PVP體系,共聚膜的離子電導率提高了兩個數(shù)量級,FTIR和XRD測試顯示共聚膜的結晶度降低,TGA分析表明共聚提高了熱穩(wěn)定性,其最大熱分解溫度為444.1℃;機械強度略有提高,為4.2 MPa;以活性炭為電極的GPE的超級電容器其電化學性能測試顯示,P(NVP-co-SSS)基GPE具有較好的電化學性能,其比電容為17.86F/g,充放電循環(huán)1000次后,比電容為原來的75%。以P(NVP-co-SSS)共聚物與聚乙烯醇(PVA)共混制備P(NVP-co-SSS)/PVA基GPE。探究PVA含量對GPE性能的影響。相比P(NVP-co-SSS)基GPE,共混膜的離子電導率增大,達10-2 S/cm數(shù)量級;TGA分析表明P(NVP-co-SSS)/PVA基GPE熱穩(wěn)定性較好,最大熱分解溫度基本不變;機械強度具有較大的提高,PVA含量為20%時,拉伸強度達10.27 MPa,為P(NVP-co-SSS)基GPE膜的2.5倍,PVA含量為50%時,拉伸強度為20.33 MPa,斷裂伸長率達637%;以活性炭為電極的聚電解質膜的超級電容器電化學性能測試顯示,P(NVP-co-SSS)/PVA基GPE電化學性能有所提高,PVA含量為20 wt.%、30 wt.%的超級電容器首次充放電的比容量為19.42 F/g、23.55 F/g,充放電循環(huán)500次后比容量為原來的90%,在1000次循環(huán)后,比容量仍為原來的85%左右。
[Abstract]:Gel polymer electrolyte (GPE) has many advantages, such as no liquid leakage, flexibility, simple structure, environmental protection and so on. It has good application value and prospect in energy storage devices. Poly (N-vinylpyrrolidone) (PVP) is a kind of better water-soluble polyelectrolyte matrix material, and the monomer is easy to modify and easy to synthesize. Copolymerization and blending are effective methods to improve the ionic conductivity and mechanical strength of GPE. Poly (N-vinylpyrrolidone-co- sodium p-styrene sulfonate) was prepared by free radical solution polymerization using N-vinylpyrrolidone and sodium p-styrene sulfonate as comonomers. The effects of the amount of initiator, crosslinking agent, temperature and monomer ratio on the absorption rate and ionic conductivity of the membrane were investigated. The results showed that when the dosage of initiator was 1.5 wt.%, and the amount of crosslinking agent was 1.0 wt.%, the temperature was 70 鈩，

本文編號：2431649