钠电池粘结剂的作用是什么？

What are the functions of binders in sodium-ion batteries?

粘结剂具备四大核心功能保障极片完整与电化学稳定。一是粘结固定，把活性、导电粉体粘结成团紧贴铝箔，杜绝涂布、分切、卷绕、长期循环掉粉脱层，防止颗粒脱落造成微短路。二是缓冲形变，硬碳、普鲁士蓝循环轻微膨胀，弹性粘结吸收应力，避免涂层开裂剥离。三化学阻隔，耐钠盐电解液腐蚀，不溶胀分解，隔离粉体与电解液局部接触，减少界面副反应。四优化浆料加工，改善粉体分散、防止沉淀团聚，保证涂布厚度均匀，提升批量极片一致性。水系粘结降低废气处理成本，适配绿色工厂，是储能电芯量产主流选择。

Binders have four core functions to guarantee electrode integrity and electrochemical stability. First, bonding and fixation: they aggregate active and conductive powders tightly onto aluminum foil, preventing powder shedding and delamination during coating, slitting, winding and long cycling to avoid micro-short circuits from detached particles. Second, deformation buffering: elastic binders absorb stress from slight volume expansion of hard carbon and Prussian blue during cycling to stop coating cracking and peeling. Third, chemical isolation: they resist corrosion and swelling from sodium electrolytes, separating powders from partial electrolyte contact and cutting interfacial side reactions. Fourth, slurry optimization: they improve powder dispersion, prevent precipitation and agglomeration, ensure uniform coating thickness and boost batch electrode consistency. Water-based binders cut waste gas treatment costs, fit green factories and dominate mass production of energy storage cells.