Gum arabic grafted poly(acrylic acid) (GA-g-PAA) is synthesized as a mechanically robust water-soluble binder for silicon (Si) anodes in lithium-ion batteries by graft polymerization of acrylic acid onto GA backbone via a free radical reaction. ¹H NMR and Fourier transform infrared spectroscopies and thermogravimetric analysis are systematically conducted to confirm the grafting polymerization process. GA-g-PAA with different grafting length of PAA shows enhanced adhesion strength and excellent flexibility after grafting. Optimal Si-GA-g-8PAA electrode displays better cyclic stability, higher Coulombic efficiency and superior rate properties compared with a Si electrode with linear PAA binder. The Si-GA-g-8PAA electrode exhibits a high electrical conductivity, low interfacial/charge transfer resistance and high lithium-ion diffusion coefficient. GA-g-8PAA binder with grafted structure not only can maintain the mechanical and electrical integrity of the electrode, facilitating favorable electrochemical kinetics, but also assists in preserving a stable solid electrolyte interphase on Si surface upon long-term cycling. Such a facile strategy for designing a novel grafted binder shows potential for practical application on high-capacity anode materials with large volume change. © 2021 Society of Industrial Chemistry.

中文翻译：

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以阿拉伯树胶接枝聚（丙烯酸）为水溶性粘合剂的 Si 阳极的粘附性和电化学性能增强

通过自由基反应将丙烯酸接枝聚合到 GA 主链上，合成阿拉伯胶接枝聚（丙烯酸）（GA- g- PAA）作为锂离子电池中硅（Si）负极的机械坚固的水溶性粘合剂. 系统地进行¹ H NMR 和傅立叶变换红外光谱和热重分析以确认接枝聚合过程。GA-克-PAA具有增强的粘附强度和柔软性优异的接枝后PAA节目不同接枝长度。与具有线性 PAA 粘合剂的 Si 电极相比，最佳的 Si-GA- g -8PAA 电极显示出更好的循环稳定性、更高的库仑效率和优异的倍率特性。Si-GA- g-8PAA 电极具有高导电性、低界面/电荷转移电阻和高锂离子扩散系数。具有接枝结构的GA- g -8PAA 粘合剂不仅可以保持电极的机械和电气完整性，促进有利的电化学动力学，而且还有助于在长期循环后在 Si 表面保持稳定的固体电解质界面。这种设计新型接枝粘合剂的简便策略显示出在体积变化大的高容量负极材料上的实际应用潜力。© 2021 工业化学学会。