The condensation of poly(acrylic acid) (PAA) with small amounts of hyperbranched poly(ethyleneimine) (PEI) resulted in the dual cross-linked network cxPAA-PEI(x) (x: wt % of PEI, x = 1, 3, and 5), consisting of physical hydrogen bonds (H bonds) and chemical covalent bonds as the framework-maintaining forces, as efficient binders for silicon anodes in lithium-ion batteries. In addition to strong mechanical strength, the inherent functional COOH and NH₂ groups of cxPAA-PEI(x)s also contribute to strong interfacial adhesive forces toward anode components (e.g., copper current collector). The mechanical properties and adhesive forces of the PAA-PEI(x) binders can be appropriately adjusted by varying the PEI content in the binders; as a result, the cxPAA-PEI (3) binder exhibited the best mechanical and binding strengths, superior to cxPAA-PEI (1) and (5). The subtle balance between the mechanical strength and adhesive force is therefore discussed in terms of the cross-linking density and H-bond interaction forces. With superior mechanical and adhesive properties, cxPAA-PEI (3) can be integrated into a silicon anode with high initial Coulombic efficiency and excellent specific capacity, with a value of 2602 mAh g^–1 at 0.2 C after 100 cycles and 1230 mAh g^–1 at 1 C after 300 cycles.

中文翻译：

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源自超支化聚乙烯亚胺和聚丙烯酸的双交联聚合物网络，作为锂离子电池中硅阳极的高效粘合剂

聚丙烯酸（PAA）与少量超支化聚亚乙基亚胺（PEI）的缩合导致双交联网络cxPAA-PEI（x）（x：PEI的重量％，x = 1，3和5），由物理氢键（H键）和化学共价键（作为框架保持力）组成，是锂离子电池中硅阳极的有效粘合剂。除了强大的机械强度外，cxPAA-PEI（x）的固有功能性COOH和NH ₂基团还有助于增强对阳极组件（例如铜集电器）的界面粘合力。的机械性能和PAA-PEI的粘合力（X）可以通过改变粘合剂中的PEI含量来适当地调节粘合剂；结果，cxPAA-PEI（3）粘结剂表现出最好的机械强度和粘结强度，优于cxPAA-PEI（1）和（5）。因此，根据交联密度和氢键相互作用力讨论了机械强度和粘合力之间的微妙平衡。cxPAA-PEI（3）具有出色的机械和粘合性能，可以集成到具有高初始库仑效率和出色比容量的硅阳极中，经过100次循环后在0.2 C下的值为2602 mAh g ^–1，而在1230 mAh g下为^{– 1}，在300次循环后1℃。