Mussel Inspired Modification of Polypropylene Separators by Catechol/Polyamine for Li-Ion Batteries
Mussel Inspired Modification of Polypropylene Separators by Catechol/Polyamine for Li-Ion Batteries
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受贻贝启发的儿茶酚/聚胺对锂离子电池聚丙烯隔膜的改性
DOI：
10.1021/am406052u
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发表时间：
2014-04-23
影响因子：
9.5
通讯作者：
Xu, Jian
中科院分区：
文献类型：
--
作者：
Wang, Hao;Wu, Junjie;Xu, Jian
多巴胺是一种模拟黏附的分子，受贻贝黏附作用的启发，被广泛应用于从有机到无机各种材料的表面改性。然而，多巴胺及其衍生物价格昂贵，阻碍了它们的大规模应用。在这里，我们用低成本的儿茶酚和多胺代替多巴胺（仅为多巴胺成本的8%），它们可以在碱性溶液中聚合并沉积在各种材料的表面。通过这种廉价、简单的改性方法，聚丙烯（PP）分离器可以由疏水性转变为亲水性，同时保持隔膜的孔隙结构和力学性能不变。经亲水性改性后，电解质的吸收率由80%提高到270%。电化学研究表明，在电流密度为0.1 C时，使用改性PP隔膜的电池在第一次循环中具有更好的库仑效率（80.9% ~ 85.3%），放电电流密度提高到15 C，放电容量比使用裸PP隔膜的电池提高1.4倍。此外，该修改允许在流形循环期间具有出色的稳定性。该研究为利用低成本的化学物质模拟贻贝的粘附提供了新的见解，并在许多领域具有潜在的实际应用前景。
Inspired by the remarkable adhesion of mussel, dopamine, a mimicking adhesive molecule, has been widely used for surface modification of various materials ranging from organic to inorganic. However, dopamine and its derivatives are expensive which impede their application in large scale. Herein, we replaced dopamine with low-cost catechol and polyamine (only 8% of the cost of dopamine), which could be polymerized in an alkaline solution and deposited on the surfaces of various materials. By using this cheap and simple modification method, polypropylene (PP) separator could be transformed from hydrophobic to hydrophilic, while the pore structure and mechanical property of the separator remained intact. The uptake of electrolyte increased from 80% to 270% after the hydrophilic modification. Electrochemical studies demonstrated that battery with the modified PP separator had a better Coulombic efficiency (80.9% to 85.3%) during the first cycle at a current density of 0.1 C, while the discharging current density increased to 15 C and the discharge capacity increased by 1.4 times compared to the battery using the bare PP separator. Additionally, the modification allowed excellent stability during manifold cycles. This study provides new insights into utilizing low-cost chemicals to mimic the mussel adhesion and has potential practical application in many fields.