Sulfonation of alginate grafted with polyacrylamide as a potential binder for high-capacity Si/C anodes.
Sulfonation of alginate grafted with polyacrylamide as a potential binder for high-capacity Si/C anodes.
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用聚丙烯酰胺移植的藻酸盐作为高容量SI/C阳极的潜在粘合剂。
DOI：
10.1039/d0ra07557d
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发表时间：
2020-10-12
期刊：
影响因子：
3.9
通讯作者：
Oh, Eun-Suok
中科院分区：
文献类型：
--
作者：
Gendensuren, Bolormaa;He, Chengxiang;Oh, Eun-Suok
本研究提出了一种系统的方法来寻找适合高容量锂离子电池阳极的聚合物粘合剂。作为一个例子，一种新开发的SAlg-g-PAAm粘合剂，海藻酸盐与磺基功能化，随后接枝聚丙烯酰胺，用于Si/C电极。随后研究了粘结剂聚合物本身的各种特性、电极与粘结剂有关的两个基本特性以及粘结剂对电池性能的影响。在所有方面，SAlg-g-PAAm聚合物是一种非常有前途的高容量阳极粘合剂。粘合剂中的硫基提高了粘合剂和电极中的离子电导率，从而降低了电荷转移电阻。此外，聚丙烯酰胺接枝海藻酸盐的磺化显著提高了粘合剂的机械性能和粘附性能，从而减少了循环过程中产生的体积变化。SAlg-g-PAAm粘结剂的这些优点最终导致高容量Si/C电极的电化学性能显著提高。本研究提出了一种系统的方法来寻找适合高容量锂离子电池阳极的聚合物粘合剂。
A systematic approach for how to find an appropriate polymer binder for high-capacity LIB anodes is presented in this study. As an example, a newly-developed SAlg-g-PAAm binder, alginate functionalized with sulfo groups and subsequently grafted with polyacrylamide, is used for the Si/C electrode. Various characteristics of the binder polymer itself, two basic characteristics of the electrode with respect to the binder, and the effect of the binder on cell performance are subsequently investigated. In all respects, the SAlg-g-PAAm polymer is a very promising binder for high-capacity anodes. The sulfo groups in the binder improve the ionic conductivities in both the binder and the electrode, leading to reduced charge transfer resistance. In addition, the sulfonation of the alginate grafted with polyacrylamide significantly enhances the mechanical and adhesion properties of the binder and consequently decreases the volume change generated during cycles. These advantages of the SAlg-g-PAAm binder ultimately lead to a considerable enhancement in the electrochemical performance of the high-capacity Si/C electrodes. A systematic approach for how to find an appropriate polymer binder for high-capacity LIB anodes is presented in this study.
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