Binders play a significant role in the electrochemical performance of electrodes in batteries, especially for high-capacity conversion/alloying-type electrodes. However, the effects of binders on the electrochemical performance of the conversion/alloying-type anodes in sodium ion batteries are not widely investigated. In this work, we use SnS₂ as a model anode and comparatively investigate the performance of six different types of binders in SnS₂ electrodes of sodium ion batteries by half-cell testing. The binders are sodium carboxymethyl cellulose (CMC-Na), sodium polyacrylate (PAA-Na), CMC-Na-PAA-Na (1:1, wt%, denoted as PAA-CMC), sodium alginate (ALG-Na), PVDF, PTFE. The PAA-CMC binder electrodes exhibit outstanding cycling and rate performance, delivering a reversible capacity of 400 mAh g⁻¹ at the current density of 100 mA g⁻¹ within 70 cycles. Our results indicate that the binder with a large fraction of carboxylate and hydroxyl groups, which lead to stronger hydrogen bonds and/or covalent chemical bonds with the carbon black and active materials, is advantageous for the electrochemical performances of SnS₂ electrodes. The synergistic interactions among the binder and the surface of both the active materials of SnS₂ and the conductive additive of ketjen black have been also schematically proposed in this study.

粘合剂在电池中电极的电化学性能中起着重要作用，尤其是对于大容量转换/合金化电极而言。然而，尚未广泛研究粘合剂对钠离子电池中转化/合金化阳极的电化学性能的影响。在这项工作中，我们使用SnS ₂作为模型阳极，并比较研究了SnS ₂中六种不同类型的粘结剂的性能。钠离子电池的电极通过半电池测试。粘合剂是羧甲基纤维素钠（CMC-Na），聚丙烯酸钠（PAA-Na），CMC-Na-PAA-Na（1：1，wt％，表示为PAA-CMC），海藻酸钠（ALG-Na）， PVDF，聚四氟乙烯。PAA-CMC粘合剂电极表现出出色的循环和速率性能，在70个循环内以100 mA g ^-1的电流密度提供400 mAh g ^-1的可逆容量。我们的结果表明，具有较大比例的羧酸根和羟基的粘合剂会导致与炭黑和活性材料的更强的氢键和/或共价化学键，有利于SnS ₂的电化学性能电极。在这项研究中，还示意性地提出了粘合剂与SnS ₂活性材料和科琴黑导电添加剂两者的表面之间的协同相互作用。