The practical application of Li-S batteries is severely restricted by limited cycle life and low sulfur loading.Here,a common industrial paint,methylated amino resin(MAR),was employed as a novel multifunctional binder...The practical application of Li-S batteries is severely restricted by limited cycle life and low sulfur loading.Here,a common industrial paint,methylated amino resin(MAR),was employed as a novel multifunctional binder to address these issues.The S cathodes by using MAR binder(S@MAR) demonstrate an excellent reversible capacity of 480.9 mA·h·g^(-1) after 400 cycles at a rate of 0.5 C,and the sulfur loading in the electrode could achieve as high as 3.0 mg·cm^(-2).These achievements are ascribed to the superior mechanical property for volume expansion,better adsorption ability toward poly sulfides,and more favorable Li+transportation of MAR,compared to the conventional binders of polyvinylidene difluoride and carboxymethylcellulose.This study paves a new way for obtaining high-energy-density Li-S batteries by the simple application of multifunctional binder that are inherently cost-effective.展开更多
以正硅酸乙酯(TEOS)和双[3-(三乙氧基硅烷)丙基]胺(BTA)为水解前驱体,十二烷基苯磺酸钠(SDBS)为表面活性剂,利用溶胶-凝胶法制备了氨基纳米硅溶胶(TB),将其与环氧基氟代丙烯酸树脂(FBSA)上的环氧基开环共聚,得到一种纳米杂化树脂(NA-FB)...以正硅酸乙酯(TEOS)和双[3-(三乙氧基硅烷)丙基]胺(BTA)为水解前驱体,十二烷基苯磺酸钠(SDBS)为表面活性剂,利用溶胶-凝胶法制备了氨基纳米硅溶胶(TB),将其与环氧基氟代丙烯酸树脂(FBSA)上的环氧基开环共聚,得到一种纳米杂化树脂(NA-FB),并以NA-FB为成膜物质,制得了纳米改性透明涂层。用FTIR、XPS、TEM和SEM对产物的形貌、结构及性能进行了表征和测试,探讨了SDBS用量对纳米TB体系稳定性和黏度的影响及纳米TB用量对涂层性能的影响。结果表明:纳米TB在微观上表现出多相分离的微球结构,分散均匀;SDBS的质量浓度为0.5 g/L时,纳米TB的稳定性可达60 d,黏度为2.8 m Pa·s;纳米TB的质量分数为10%(以FBSA质量计)时,涂层的硬度达到5H,涂层表面的接触角可达138°,附着力仍保持0级,且涂层表现出较高的透明性。展开更多
A resin-modified glass-ionomer cement (RMGIC) was studied from a computational point of view. We suggest terpolymer formation by reaction of fixation through a combination of acrylic acid (AA), itaconic acid (IA) and ...A resin-modified glass-ionomer cement (RMGIC) was studied from a computational point of view. We suggest terpolymer formation by reaction of fixation through a combination of acrylic acid (AA), itaconic acid (IA) and an aminoacid derivative (AAD) in different positions. We found that AAD-AA-IA is thermodynamically more stable, but AA-IA-AAD is the combination which can react with glycidyl methacrylate (GM) to form a grafted polymer with two pendant methacrylate groups which can be used later in the process of light-curing. A RMGIC contains a glass powder of calcium-fluoroaluminosilicate acting as the source of cross linking, and for this reason, we have optimized two intramolecular Al3+ tricarboxylate complexes (salt-bridges) formed from the most stable grafted polymers. A possible reaction mechanism for the addition of (GM) to copolymer is proposed.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51902036 and51865021)the Natural Science Foundation of Chongqing Science&Technology Commission(No.cstc2019jcyj-msxm1407)+4 种基金the Natural Science Foundation of Chongqing Technology and Business University(No.1952009)the Venture&Innovation SupportProgram for Chongqing Overseas Returnees(No.CX2018129)the Science and Technology Research Program of Chongqing Municipal Education Commission(Nos.KJQN201900826 and KJQN201800808)the Innovation Group of New Technologies for Industrial Pollution Control of Chongqing Education Commission(No.CXQT19023)the Open Research Fund of Chongqing Key Laboratory of Catalysis and New Environmental Materials(No.KFJJ2018082)。
文摘The practical application of Li-S batteries is severely restricted by limited cycle life and low sulfur loading.Here,a common industrial paint,methylated amino resin(MAR),was employed as a novel multifunctional binder to address these issues.The S cathodes by using MAR binder(S@MAR) demonstrate an excellent reversible capacity of 480.9 mA·h·g^(-1) after 400 cycles at a rate of 0.5 C,and the sulfur loading in the electrode could achieve as high as 3.0 mg·cm^(-2).These achievements are ascribed to the superior mechanical property for volume expansion,better adsorption ability toward poly sulfides,and more favorable Li+transportation of MAR,compared to the conventional binders of polyvinylidene difluoride and carboxymethylcellulose.This study paves a new way for obtaining high-energy-density Li-S batteries by the simple application of multifunctional binder that are inherently cost-effective.
文摘以正硅酸乙酯(TEOS)和双[3-(三乙氧基硅烷)丙基]胺(BTA)为水解前驱体,十二烷基苯磺酸钠(SDBS)为表面活性剂,利用溶胶-凝胶法制备了氨基纳米硅溶胶(TB),将其与环氧基氟代丙烯酸树脂(FBSA)上的环氧基开环共聚,得到一种纳米杂化树脂(NA-FB),并以NA-FB为成膜物质,制得了纳米改性透明涂层。用FTIR、XPS、TEM和SEM对产物的形貌、结构及性能进行了表征和测试,探讨了SDBS用量对纳米TB体系稳定性和黏度的影响及纳米TB用量对涂层性能的影响。结果表明:纳米TB在微观上表现出多相分离的微球结构,分散均匀;SDBS的质量浓度为0.5 g/L时,纳米TB的稳定性可达60 d,黏度为2.8 m Pa·s;纳米TB的质量分数为10%(以FBSA质量计)时,涂层的硬度达到5H,涂层表面的接触角可达138°,附着力仍保持0级,且涂层表现出较高的透明性。
文摘A resin-modified glass-ionomer cement (RMGIC) was studied from a computational point of view. We suggest terpolymer formation by reaction of fixation through a combination of acrylic acid (AA), itaconic acid (IA) and an aminoacid derivative (AAD) in different positions. We found that AAD-AA-IA is thermodynamically more stable, but AA-IA-AAD is the combination which can react with glycidyl methacrylate (GM) to form a grafted polymer with two pendant methacrylate groups which can be used later in the process of light-curing. A RMGIC contains a glass powder of calcium-fluoroaluminosilicate acting as the source of cross linking, and for this reason, we have optimized two intramolecular Al3+ tricarboxylate complexes (salt-bridges) formed from the most stable grafted polymers. A possible reaction mechanism for the addition of (GM) to copolymer is proposed.
