安全性是制约锂离子电池向电动汽车领域应用拓展的主要障碍之一.本工作提出了一种能够有效改善锂离子电池安全性的电解液添加剂3,4-乙烯二氧噻吩单体(EDOT),研究了EDOT在有机电解液中的电氧化聚合行为及其对Li Co O2电极高温热行为和电...安全性是制约锂离子电池向电动汽车领域应用拓展的主要障碍之一.本工作提出了一种能够有效改善锂离子电池安全性的电解液添加剂3,4-乙烯二氧噻吩单体(EDOT),研究了EDOT在有机电解液中的电氧化聚合行为及其对Li Co O2电极高温热行为和电池安全性、电化学性能的影响.循环伏安(CV)和透射电镜(TEM)表征结果表明,单体添加剂能够在电池充电过程发生电氧化聚合,在正极表面形成一层聚(3,4-乙烯二氧噻吩)(PEDOT)导电聚合物膜.差示扫描量热(DSC)分析结果显示,PEDOT隔离了电解液与正极表面的直接接触,减少了过热条件下电解液在正极表面的分解放热.安全性测试结果表明,在电解液中仅添加0.1%的EDOT单体,即可将电池在150oC高温热冲击下发生热失控的时间推迟13.8 min.电化学性能测试结果表明,聚合产物良好的电子导电性能有效改善正极的电子传导能力,在一定程度上提高电池的倍率性能和循环稳定性,而容量、低温性能等基本不受影响,展示出良好的应用前景.展开更多
The catalytic activity of poly（styrene-acrylic acid） （PSAA） supported neodymium chloride （NdCl3） complex for the copolymerization of styrene and 4-Vinylpyridine was studied. The influence of various factors, suc...The catalytic activity of poly（styrene-acrylic acid） （PSAA） supported neodymium chloride （NdCl3） complex for the copolymerization of styrene and 4-Vinylpyridine was studied. The influence of various factors, such as Al/Nd molar ratio, reaction time, macromolecular carder （PSAA）, and ratio of styrene to 4-vinypyridine （g/g）, on the copolymerization yield of styrene and 4-Vinylpyridine was investigated. The results showed that the copolymerization of polar monomers with olefins occurred efficiently and the catalytic activity of polymer-supported catalyst was higher than that of the similar small molecular catalysts. The activity of PSAA.Nd complex increased with in- creasing Al/Nd molar ratios and decreased with increasing polymerization time. The highest activity of PSAA＇Nd was observed at 120 min, and the highest yield was found at the ratio of styrene to 4-vinylpyridine of 4：2. DSC analysis presented that the resulted polymer had only one glass transition temperature, and showed very good thermal stability.展开更多
The catalytic activity of poly（styrene-cryli- caeid） （PSAA） supported neodymium chloride （NdCl3） complex for the copolymerization of styrene and 4-vinylpyridine was studied. The influence of various factors, suc...The catalytic activity of poly（styrene-cryli- caeid） （PSAA） supported neodymium chloride （NdCl3） complex for the copolymerization of styrene and 4-vinylpyridine was studied. The influence of various factors, such as Al/Nd molar ratio, reaction time, and ratio of styrene to 4-vinypyridine （g· g^-1 ）, on copolymerization of styrene and 4-Vinylpridine was investigated. The results show that the copolymerization of polar monomers with olefins occurs efficiently. The catalytic activity of polymer-supported catalyst is higher than that of the similar small molecule catalysts. The activity of PSAA· Nd complex increases with increasing Al/Nd ratios and decreases with increasing polymerization time, the highest activity of PSAA· Nd is observed at 120 min. High yield is found at the ratio of styrene to 4-vinylpyridine is 4：2. The resulted polymer shows very good thermal stability.展开更多
文摘安全性是制约锂离子电池向电动汽车领域应用拓展的主要障碍之一.本工作提出了一种能够有效改善锂离子电池安全性的电解液添加剂3,4-乙烯二氧噻吩单体(EDOT),研究了EDOT在有机电解液中的电氧化聚合行为及其对Li Co O2电极高温热行为和电池安全性、电化学性能的影响.循环伏安(CV)和透射电镜(TEM)表征结果表明,单体添加剂能够在电池充电过程发生电氧化聚合,在正极表面形成一层聚(3,4-乙烯二氧噻吩)(PEDOT)导电聚合物膜.差示扫描量热(DSC)分析结果显示,PEDOT隔离了电解液与正极表面的直接接触,减少了过热条件下电解液在正极表面的分解放热.安全性测试结果表明,在电解液中仅添加0.1%的EDOT单体,即可将电池在150oC高温热冲击下发生热失控的时间推迟13.8 min.电化学性能测试结果表明,聚合产物良好的电子导电性能有效改善正极的电子传导能力,在一定程度上提高电池的倍率性能和循环稳定性,而容量、低温性能等基本不受影响,展示出良好的应用前景.
基金Science Technology Foundation of Jilin Province (200223)
文摘The catalytic activity of poly（styrene-acrylic acid） （PSAA） supported neodymium chloride （NdCl3） complex for the copolymerization of styrene and 4-Vinylpyridine was studied. The influence of various factors, such as Al/Nd molar ratio, reaction time, macromolecular carder （PSAA）, and ratio of styrene to 4-vinypyridine （g/g）, on the copolymerization yield of styrene and 4-Vinylpyridine was investigated. The results showed that the copolymerization of polar monomers with olefins occurred efficiently and the catalytic activity of polymer-supported catalyst was higher than that of the similar small molecular catalysts. The activity of PSAA.Nd complex increased with in- creasing Al/Nd molar ratios and decreased with increasing polymerization time. The highest activity of PSAA＇Nd was observed at 120 min, and the highest yield was found at the ratio of styrene to 4-vinylpyridine of 4：2. DSC analysis presented that the resulted polymer had only one glass transition temperature, and showed very good thermal stability.
文摘The catalytic activity of poly（styrene-cryli- caeid） （PSAA） supported neodymium chloride （NdCl3） complex for the copolymerization of styrene and 4-vinylpyridine was studied. The influence of various factors, such as Al/Nd molar ratio, reaction time, and ratio of styrene to 4-vinypyridine （g· g^-1 ）, on copolymerization of styrene and 4-Vinylpridine was investigated. The results show that the copolymerization of polar monomers with olefins occurs efficiently. The catalytic activity of polymer-supported catalyst is higher than that of the similar small molecule catalysts. The activity of PSAA· Nd complex increases with increasing Al/Nd ratios and decreases with increasing polymerization time, the highest activity of PSAA· Nd is observed at 120 min. High yield is found at the ratio of styrene to 4-vinylpyridine is 4：2. The resulted polymer shows very good thermal stability.
