Polymeric binders have frequently been applied as an important component of Si‐based anodes in lithium‐ion batteries, because they can efficiently restrict the large volume change of Si nanoparticles (Si NPs) during charging/discharging cycles. Therefore, we developed a novel pectin/poly(acrylic acid) (PECAA/PAA) blend binder with reversible elasticity to sustain the volume change of Si NPs. Through the study on pure PAA and PEC/PAA(x ) (x : weight fraction of PEC), a subtle balance between mechanical properties and density of interacting groups was found to be important in controlling the binding and electrochemical performances of the Si anodes. The PAA‐based Si anode is inferior in terms of the performance, but the addition of PEC resulted in the PEC/PAA(10) anode with an excellent binding and electrochemical performance. The PEC/PAA(10) anode exhibited a high capacity of 2386 mAh g⁻¹ after 100 cycles, significantly higher than 1508 mAh g⁻¹ from the PAA anode. However, a further increase of PEC content adversely reduced the electrochemical performance of the PEC/PAA(20) and (30) anodes, owing to the decrease in the interacting COOH groups. Optimal composition adjustment is, therefore, of crucial importance in achieving a polymer blend binder with enhanced binding and electrochemical performances.

中文翻译：

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果胶/聚（丙烯酸）的聚合物共混物作为锂离子电池中硅阳极的高效粘合剂

聚合物粘合剂经常被用作锂离子电池中硅基负极的重要组成部分，因为它们可以有效地限制硅纳米颗粒（Si NPs）在充电/放电周期中的大体积变化。因此，我们开发了一种具有可逆弹性的新型果胶/聚丙烯酸（PECAA / PAA）共混粘合剂，以维持Si NP的体积变化。通过研究纯PAA和PEC / PAA（x）（x：PEC的重量分数），发现机械性能和相互作用基团密度之间的微妙平衡对于控制Si阳极的结合和电化学性能很重要。基于PAA的Si阳极的性能较差，但是PEC的添加导致PEC / PAA（10）阳极具有出色的结合和电化学性能。PEC / PAA（10）阳极经过100次循环后显示出2386 mAh g ^-1的高容量，明显高于1508 mAh g ^-1从PAA阳极。但是，由于相互作用的COOH基团的减少，PEC含量的进一步增加不利地降低了PEC / PAA（20）和（30）阳极的电化学性能。因此，最佳的组成调节对于获得具有增强的结合和电化学性能的聚合物共混物粘合剂至关重要。