本文關(guān)鍵詞： 硫電極 水溶性粘結(jié)劑 嵌段共聚物 聚(苯乙烯-b-丙烯酸正丁酯-b-苯乙烯)　出處：《高校化學(xué)工程學(xué)報》2017年03期 　論文類型：期刊論文

【摘要】：硫正極材料因具有較高的能量密度而廣受關(guān)注,但由于其在充放電過程中體積變化大、硫穿梭效應(yīng)使其容量衰退快等原因,大大限制了其實際使用。本文通過RAFT乳液聚合首次設(shè)計合成了聚(苯乙烯-b-丙烯酸正丁酯-b-苯乙烯)(Sn BAS)三嵌段共聚物作為硫電極粘結(jié)劑。通過制備粘結(jié)劑薄膜測試其在醚類電解液的溶脹性,并進行多倍率充放電、電池壽命測試,與聚苯乙烯(PS)、聚丙烯酸正丁酯(Pn BA)及商用SBR對比,發(fā)現(xiàn)通過調(diào)配苯乙烯/丙烯酸正丁酯(St/n BA)質(zhì)量比率可獲得兼具高力學(xué)強度及高電解液溶脹率的電極粘結(jié)劑。將粘結(jié)劑Sn BAS100用于制備硫電極,所得硫正極分別在0.1C、0.2C、0.5C、1C、2C、0.1C倍率充放電后,再次以0.2C倍率充放電所得放電比容量為781 m Ah×g-1,與首次充放電時的放電比容量1061 m Ah×g~(-1)相比,容量保留率為73.6%。電極繼續(xù)100次循環(huán)后放電比容量為740m Ah×g~(-1),容量保留率為94.7%,每次充放電的平均容量衰退率為0.05%。結(jié)果表明,水溶性嵌段結(jié)構(gòu)的SnBAS粘結(jié)劑是一種極具應(yīng)用潛力的水基硫正極粘結(jié)劑。
[Abstract]:Sulfur cathode materials have attracted much attention because of their high energy density. However, due to the large volume change in charge and discharge process, the sulfur shuttle effect causes its capacity to decline rapidly. In this paper, the triblock copolymers of n-butyl styrene-bacrylate (n-butyl acrylate) as binder for sulfur electrode were designed and synthesized for the first time by RAFT emulsion polymerization. The binder film was prepared by the preparation of binder film. To test its swelling in ether electrolyte, Multirate charge-discharge, battery life test, and comparison with polystyrene (PS), poly (butyl acrylate) (PN), and commercial SBR were carried out. It was found that an electrode binder with high mechanical strength and high swelling rate of electrolyte could be obtained by blending styrene / n-butyl acrylate (St / n-BA) mass ratio. The binder Sn BAS100 was used to prepare sulfur electrode. The specific discharge capacity obtained by charging and discharging at 0.2C rate was 781mAh 脳 g-1, which was compared with 1061mAh 脳 gc-1 at the first charge-discharge. The specific discharge capacity of the electrode is 740mAh 脳 gu ~ (-1), the capacity retention is 94.77.The average capacity decline rate of each charge and discharge is 0.05. the results show that, after 100 cycles, the specific discharge capacity of the electrode is 740mAh 脳 GG ~ (-1), and the capacity retention ratio is 94.70.The results show that, SnBAS binder with water soluble block structure is a potential water-based sulfur positive binder.
【作者單位】： 化學(xué)工程聯(lián)合國家重點實驗室(浙江大學(xué));浙江大學(xué)化學(xué)工程與生物工程學(xué)院;浙江省能源與核技術(shù)應(yīng)用研究所;Department
【基金】：國家自然科學(xué)基金(21574115) 浙江省科技計劃項目(2015F50022)
【分類號】：TM912;TQ437
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本文編號：1556244