Preparation of amorphous Ni-W coating for the current collector of Na/S battery by electrodeposition

• Published in: Surface & coatings technology Vol. 346; pp. 40 - 47
• Main Authors: Zhang, Meng-fan, Zhu, Cheng-fei, Yang, Chen-peng, Lv, Yi-nan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.07.2018; Elsevier BV
• Subjects: Batteries; Coated electrodes; Corrosion rate; Corrosion resistance; Corrosion tests; Electrical resistivity; Electrodeposition; High temperature sulfur corrosion; Ni-W coating; Protective coatings; Sodium; Sodium-sulfur battery; SS430 current collector; Stainless steel; Sulfur; X ray photoelectron spectroscopy; High temperature sulfur corrosion; Electrodeposition; SS430 current collector; Ni-W coating; Sodium-sulfur battery
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2018.04.041

Stainless steel 430 (SS430) was usually used as current collector of sodium‑sulfur batteries, but it had limited corrosion resistance in high temperature sulfur environment. In this paper, the amorphous Ni-W coating was synthesized on the SS430 surface by the electrodeposition technique. The element Ce was added to improve the density of the coating moreover. Their structure and electrical conductivity were investigated by XRD, SEM, XPS and four probe tester respectively. The corrosion resistance of SS430 and two kinds of coatings had been studied in sulfur environment at 350 °C. The results indicated that amorphous Ni-W coating could slow down the corrosion of SS430 in high temperature molten sulfur environment and improve the conductivity. And the introduction of Ce could prompt the crystalline bulks refinement and the microstructure compact. The corrosion rate of Ni-W-Ce coating was 0.0612 mm/y after corrosion for 120 h in high temperature sulfur environment and the block resistance was 0.3055 mΩ. •The 120 h corrosion rate of SS430 current collector was 0.6852 mm/y in Na/S battery.•The amorphous Ni-W coating of SS430 was firstly prepared by electrodeposition.•The Ni-W coating could effectively slow down the corrosion rate of the SS430.•Ce element can optimize the structures and performance of the Ni-W coating.