Abstract In this study, the effects of four kinds of binders including polyimide (PI), sodium alginate (SA), polyvinylidene fluoride (PVDF), and sodium carboxymethyl cellulose (CMC) on the electrochemical properties of a high capacity silicon composite anode (SMG@C) were investigated. Phase constitutes and morphologies of the SMG@C anode materials were carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The electrochemical properties of the SMG@C anode using the four kinds of binders were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results showed that in the case of using SA as the binder, the discharge capacity reached 1207 mAh/g after 75 cycles at a current density of 100 mA/g, indicating the best cycle stability. Moreover, the discharge capacity can be restored to the initial capacity state during rate-cycle testing; and the impedance was the lowest among the four binders. This paper also analysed the measured electrochemical impedance spectra with the four different binders and revealed their action mechanisms.

中文翻译：

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粘结剂对高容量硅复合负极电化学性能的影响

摘要 本研究探讨了聚酰亚胺 (PI)、海藻酸钠 (SA)、聚偏二氟乙烯 (PVDF) 和羧甲基纤维素钠 (CMC) 四种粘合剂对高容量硅复合负极 (SMG) 电化学性能的影响。 @C) 进行了调查。使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 对 SMG@C 负极材料的相组成和形貌进行了研究。通过循环伏安法 (CV) 和电化学阻抗谱 (EIS) 研究了使用四种粘合剂的 SMG@C 负极的电化学性能。结果表明，在使用SA作为粘合剂的情况下，在100 mA/g的电流密度下循环75次后放电容量达到1207 mAh/g，循环稳定性最好。而且，放电容量可在倍率循环测试中恢复到初始容量状态；并且阻抗是四种粘合剂中最低的。本文还分析了四种不同粘合剂的电化学阻抗谱，并揭示了它们的作用机制。