發(fā)布時間：2018-06-22 05:29

  本文選題：鋰硫電池 + 聚苯胺　； 參考：《長春理工大學(xué)》2017年碩士論文

【摘要】：單質(zhì)硫價格低廉,儲量豐富,理論比容量較高,現(xiàn)被廣泛用作鋰硫電池正極研究。但單質(zhì)硫及其放電終產(chǎn)物為絕緣體,且充放電過程中產(chǎn)生的多硫化物向電解液擴(kuò)散引起的穿梭效應(yīng)影響電池性能。本論文將導(dǎo)電聚苯胺與單質(zhì)硫復(fù)合,在改善其導(dǎo)電性的同時利用吸附作用抑制多硫化物的穿梭效應(yīng)。本論文在水-乙醇的液相體系中制備了硫酸、醋酸、硝酸摻雜的聚苯胺-硫-碳復(fù)合材料,研究不同酸摻雜的聚苯胺對電池性能的影響。通過電池測試發(fā)現(xiàn),三種復(fù)合材料的循環(huán)性能具有差異,借助量子化學(xué)計(jì)算結(jié)合能,經(jīng)不同質(zhì)子酸摻雜的導(dǎo)電聚苯胺對多硫化物的吸附強(qiáng)度不同。利用一種與多硫化物具有高結(jié)合位點(diǎn)和高結(jié)合能的聚苯胺的質(zhì)子酸摻雜劑—酸性磷酸酯,制得層層包裹的聚苯胺-硫-碳復(fù)合納米材料。該材料具有較好的電池性能:0.5C的倍率下,第一圈放電比容量為1283 mAh/g,充放電循環(huán)100圈后比容量保持率為86.4%。
[Abstract]:Because of its low price, abundant reserves and high theoretical specific capacity, it is widely used in the research of lithium sulfur batteries. However, simple sulfur and its discharge end product are insulators, and the shuttle effect caused by the diffusion of polysulfide into electrolyte during charge and discharge affects the performance of the battery. In this paper, the conductive Polyaniline is combined with simple sulfur to improve its conductivity and to suppress the shuttle effect of polysulfide by adsorption at the same time. In this paper, Polyaniline-sulfur-carbon composites doped with sulfuric acid, acetic acid and nitric acid were prepared in water-ethanol liquid system. The effect of different acid-doped Polyaniline on the performance of the battery was studied It was found that the cyclic properties of the three composites were different. By means of quantum chemistry calculation of binding energy, the adsorption strength of polysulfide was different with different protonic acid doped conductive Polyaniline. Polyaniline-sulfur / carbon nanocomposite nanomaterials were prepared by using a proton acid dopant acid phosphate ester with high binding site and high binding energy to polysulfide. The specific discharge capacity of the first cycle is 1283 mg / g, and the specific capacity retention is 86.4 after 100 cycles of charge / discharge cycle.
【學(xué)位授予單位】：長春理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB33;TM912

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本文編號：2051775