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A Four‐Armed Polyacrylic Acid Homopolymer Binder with Enhanced Performance for SiOx/Graphite Anode
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-12-09 , DOI: 10.1002/mame.202000525 Chao Luo 1 , Xiufen Wu 1 , Tian Zhang 1 , Shang‐Sen Chi 1 , Zhengying Liu 2 , Jun Wang 1 , Chaoyang Wang 3 , Yonghong Deng 1
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-12-09 , DOI: 10.1002/mame.202000525 Chao Luo 1 , Xiufen Wu 1 , Tian Zhang 1 , Shang‐Sen Chi 1 , Zhengying Liu 2 , Jun Wang 1 , Chaoyang Wang 3 , Yonghong Deng 1
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The large‐scale application of Si‐based anodes is impeded by their fast capacity decay, which is mainly attributed to the huge volume expansion upon cycling. The employment of functional binders is one efficient method to mitigate this issue. In this work, a four‐armed polyacrylic acid (4A‐PAA) homopolymer is explored as a remarkably effective binder for Si‐based anodes. The 4A‐PAA binder is prepared via an atom transfer radical polymerization, followed by ester hydrolysis. Compared to the conventional linear polyacrylic acid (PAA) binder, the 4A‐PAA not only shows enhanced toughness due to its decreased molecular regularity and intramolecular hydrogen bond but also exhibits increased binding strength because of its multidimensional binding structure. As a result, the SiOx/graphite electrode using the 4A‐PAA retains a capacity retention of 89.1% and a capacity of 558.1 mAh g−1 after 200 cycles at 0.16 A g−1, which are superior to the PAA electrode, corresponding to 80.4% and 469.3 mAh g−1, respectively. The improved performance is attributed to the employment of the 4A‐PAA, which mitigates the volume change of the SiOx/graphite anode. This work not only offers a promising binder for Si‐based anodes but also presents a universal solution for other anodes with high volume expansion during cycling.
中文翻译：
具有增强的SiOx /石墨阳极性能的四臂聚丙烯酸酯均聚物粘合剂
硅基阳极的大规模应用受到其容量快速衰减的阻碍，这主要归因于循环时体积的巨大膨胀。使用功能性粘合剂是减轻此问题的一种有效方法。在这项工作中，探索了一种四臂聚丙烯酸（4A-PAA）均聚物作为硅基阳极的一种非常有效的粘合剂。4A-PAA粘合剂是通过原子转移自由基聚合反应，然后进行酯水解制备的。与传统的线性聚丙烯酸（PAA）粘合剂相比，4A-PAA不仅由于其分子规则性和分子内氢键降低而显示出增强的韧性，而且由于其多维结合结构而具有更高的结合强度。结果，SiO x使用4A-PAA的石墨电极/石墨电极在0.16 A g -1下200次循环后仍保持89.1％的容量保持率和558.1 mAh g -1的容量，优于PAA电极，分别为80.4％和469.3 mAh g -1。性能的提高归功于4A-PAA的使用，这减轻了SiO x /石墨阳极的体积变化。这项工作不仅为硅基阳极提供了有希望的粘合剂，而且为循环期间具有高体积膨胀的其他阳极提供了一种通用解决方案。
更新日期：2021-01-16
中文翻译：
具有增强的SiOx /石墨阳极性能的四臂聚丙烯酸酯均聚物粘合剂
硅基阳极的大规模应用受到其容量快速衰减的阻碍，这主要归因于循环时体积的巨大膨胀。使用功能性粘合剂是减轻此问题的一种有效方法。在这项工作中，探索了一种四臂聚丙烯酸（4A-PAA）均聚物作为硅基阳极的一种非常有效的粘合剂。4A-PAA粘合剂是通过原子转移自由基聚合反应，然后进行酯水解制备的。与传统的线性聚丙烯酸（PAA）粘合剂相比，4A-PAA不仅由于其分子规则性和分子内氢键降低而显示出增强的韧性，而且由于其多维结合结构而具有更高的结合强度。结果，SiO x使用4A-PAA的石墨电极/石墨电极在0.16 A g -1下200次循环后仍保持89.1％的容量保持率和558.1 mAh g -1的容量，优于PAA电极，分别为80.4％和469.3 mAh g -1。性能的提高归功于4A-PAA的使用，这减轻了SiO x /石墨阳极的体积变化。这项工作不仅为硅基阳极提供了有希望的粘合剂，而且为循环期间具有高体积膨胀的其他阳极提供了一种通用解决方案。
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