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Hierarchical self-assembly of tannic acid/diethylenetriamine on polypropylene for high-performance separator
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-02-02 , DOI: 10.1002/app.55222 Haihua Wang 1, 2, 3 , Yun Han 1 , Xuan Liu 1 , Liyu Sun 1 , Huizhu Niu 1 , Yifan Du 1 , Jie Wang 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-02-02 , DOI: 10.1002/app.55222 Haihua Wang 1, 2, 3 , Yun Han 1 , Xuan Liu 1 , Liyu Sun 1 , Huizhu Niu 1 , Yifan Du 1 , Jie Wang 1
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In lithium-ion batteries (LIBs), separator is used to provide a barrier between the anode and cathode and provide freedom for the transport of lithium-ions, which serves a key function in inhibiting internal short circuit and improving the battery safety. The limited wettability of commercial polyolefin separators in electrolytes restricts its utilization in extreme environmental conditions. In our work, we choose polypropylene (PP) as the precursor and can address the issue of poor wettability through suitable modification methods. Tannic acid (TA) and diethylenetriamine (DETA) were utilized to coat PP separator via hierarchical self-assembly approach, and the coating is further stabilized by taking advantage of the specific oxidizing properties of sodium periodate. This method scarcely increases the separator thickness or sacrifices the microporous structure of the original separator. The improved separator not only exhibits outstanding wetting capability and relatively high ion conductivity (1.24 mS cm−1), but also has the highest lithium-ion migration number of 0.74. This indicates that when the modified separator is applied to LIBs, its electrochemical performance is significantly enhanced. The enhancement in electrochemical performance of LIBs is attributed to the strong absorption and retention ability of the coating on the separator. The reversible capacity of Li/PP-TD2 separator/LiFePO4 battery is 144.3 mAh g−1 at 2C, which is higher than that of PP separator (117.1 mAh g−1) under the same current density. Even after 200 cycles, the PP-TD2 separator with two-layer assembly modification still maintains a higher coulombic efficiency of 97.55% and a discharge capacity of 96.6%. This hierarchical self-assembly modification of PP provides an effective approach for fabricating high-performance separator.
中文翻译：
单宁酸/二亚乙基三胺在聚丙烯上的分级自组装用于高性能隔膜
在锂离子电池（LIB）中，隔膜用于在阳极和阴极之间提供屏障，并为锂离子的传输提供自由度，这在抑制内部短路和提高电池安全性方面发挥着关键作用。商用聚烯烃隔膜在电解质中的润湿性有限限制了其在极端环境条件下的使用。在我们的工作中，我们选择聚丙烯（PP）作为前驱体，可以通过适当的改性方法解决润湿性差的问题。采用单宁酸（TA）和二乙烯三胺（DETA）通过分级自组装方法涂覆PP隔膜，并利用高碘酸钠的特定氧化特性进一步稳定涂层。该方法几乎不增加隔膜的厚度或牺牲原始隔膜的微孔结构。改进后的隔膜不仅表现出优异的润湿能力和较高的离子电导率（1.24 mS cm -1），而且具有最高的锂离子迁移数为0.74。这表明当改性隔膜应用于LIB时，其电化学性能显着增强。锂离子电池电化学性能的增强归因于隔膜上涂层的强吸收和保留能力。Li/PP-TD2隔膜/LiFePO 4电池在2C下的可逆容量为144.3mAh g -1，高于相同电流密度下PP隔膜的可逆容量（117.1mAh g -1 ）。即使经过200次循环，经过两层组装改造的PP-TD2隔膜仍然保持着97.55%的较高库仑效率和96.6%的放电容量。PP的这种分层自组装改性为制造高性能隔膜提供了一种有效的方法。
更新日期：2024-02-02
中文翻译：
单宁酸/二亚乙基三胺在聚丙烯上的分级自组装用于高性能隔膜
在锂离子电池（LIB）中，隔膜用于在阳极和阴极之间提供屏障，并为锂离子的传输提供自由度，这在抑制内部短路和提高电池安全性方面发挥着关键作用。商用聚烯烃隔膜在电解质中的润湿性有限限制了其在极端环境条件下的使用。在我们的工作中，我们选择聚丙烯（PP）作为前驱体，可以通过适当的改性方法解决润湿性差的问题。采用单宁酸（TA）和二乙烯三胺（DETA）通过分级自组装方法涂覆PP隔膜，并利用高碘酸钠的特定氧化特性进一步稳定涂层。该方法几乎不增加隔膜的厚度或牺牲原始隔膜的微孔结构。改进后的隔膜不仅表现出优异的润湿能力和较高的离子电导率（1.24 mS cm -1），而且具有最高的锂离子迁移数为0.74。这表明当改性隔膜应用于LIB时，其电化学性能显着增强。锂离子电池电化学性能的增强归因于隔膜上涂层的强吸收和保留能力。Li/PP-TD2隔膜/LiFePO 4电池在2C下的可逆容量为144.3mAh g -1，高于相同电流密度下PP隔膜的可逆容量（117.1mAh g -1 ）。即使经过200次循环，经过两层组装改造的PP-TD2隔膜仍然保持着97.55%的较高库仑效率和96.6%的放电容量。PP的这种分层自组装改性为制造高性能隔膜提供了一种有效的方法。
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