【摘要】：凝膠聚合物電解質(zhì)(GPE)具有無(wú)液體泄漏、柔性、結(jié)構(gòu)簡(jiǎn)單、環(huán)保等優(yōu)點(diǎn),在儲(chǔ)能器件中具有較好的應(yīng)用價(jià)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(zhì)基體材料,且單體易于改性、合成簡(jiǎn)便。共聚和共混是提高GPE離子電導(dǎo)率和機(jī)械強(qiáng)度的有效的方法。以N-乙烯基吡咯烷酮和對(duì)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(duì)苯乙烯磺酸鈉)即P(NVP-co-SSS)基GPE。通過(guò)探究引發(fā)劑用量、交聯(lián)劑用量、溫度、單體配比等因素對(duì)膜的吸液率和離子電導(dǎo)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(shí),膜的綜合性能最佳,其膜吸水率為18.57 g·g-1,離子電導(dǎo)率為3.58×10-3S/cm。相比PVP體系,共聚膜的離子電導(dǎo)率提高了兩個(gè)數(shù)量級(jí),FTIR和XRD測(cè)試顯示共聚膜的結(jié)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(jī)械強(qiáng)度略有提高,為4.2 MPa;以活性炭為電極的GPE的超級(jí)電容器其電化學(xué)性能測(cè)試顯示,P(NVP-co-SSS)基GPE具有較好的電化學(xué)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(lái)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(duì)GPE性能的影響。相比P(NVP-co-SSS)基GPE,共混膜的離子電導(dǎo)率增大,達(dá)10-2 S/cm數(shù)量級(jí);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(jī)械強(qiáng)度具有較大的提高,PVA含量為20%時(shí),拉伸強(qiáng)度達(dá)10.27 MPa,為P(NVP-co-SSS)基GPE膜的2.5倍,PVA含量為50%時(shí),拉伸強(qiáng)度為20.33 MPa,斷裂伸長(zhǎng)率達(dá)637%;以活性炭為電極的聚電解質(zhì)膜的超級(jí)電容器電化學(xué)性能測(cè)試顯示,P(NVP-co-SSS)/PVA基GPE電化學(xué)性能有所提高,PVA含量為20 wt.%、30 wt.%的超級(jí)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(lái)的90%,在1000次循環(huán)后,比容量仍為原來(lái)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(hào)：2431649