Aqueous sodium ion battery

The invention discloses a water-based sodium-ion battery, and belongs to the technical field of water-based batteries. The aqueous sodium-ion battery comprises a positive current collector and an electrolyte, wherein the positive current collector is made of a rolled high-alloy metal foil; an additive composed of a corrosion inhibitor and a surfactant is added into the electrolyte, and the mass of the additive accounts for 1-10% of the total mass of the electrolyte. The positive electrode current collector is a stainless steel foil and has relatively high corrosion resistance and relatively high strength, and the added electrolyte additive is matched for use, so that the capacity exertion of the battery and the cycle performance of the battery are facilitated. 本发明公开了一种水系钠离子电池，属于水系电池技术领域。该水系钠离子电池包括正极集流体和电解液，所述正极集流体材质包括压延高合金金属箔；所述电解液中添加有缓蚀剂与表面活性剂组合的添加剂，其中添加剂的质量占电解液总质量的1～10％。其正极集流体为不锈钢箔，具有较强耐腐蚀性和较高强度，配合使用加入的电解液添加剂，不仅有利于电池的容量发挥和电池的循环性能。