Sulfonation of alginate grafted with polyacrylamide as a potential binder for high-capacity Si/C anodes

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....

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Bibliographic Details
Published in:RSC advances 2020-10, Vol.1 (62), p.37898-3794
Main Authors: Gendensuren, Bolormaa, He, Chengxiang, Oh, Eun-Suok
Format: Article
Language:English
Subjects:
Adhesives
Alginates
Anodes
Charge transfer
Chemistry
Electrochemical analysis
Electrodes
Grafting
Polyacrylamide
Polymers
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Summary: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.
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra07557d