Air-Stable Prussian White Cathode Materials for Sodium-Ion Batteries Enabled by ZnO Surface Modification

• DOI: 10.1021/acsami.4c00738
• Publication Date: 2024-03-25T08:18:05Z
• Authors: Youcai Zhang; Xing Zhou; Chao Yang; Xiaowei Liu; Meilong Wang; Jin Han; Hua Yan; Ya You
• Keywords: Prussian blue; Thermal Stability

Iron-based Prussian white (PW) is one of the promising cathodes for sodium-ion batteries, owing to its high capacity and low cost. However, practical application PW hindered by poor air stability. The metal-oxide coating has been proven be an effective way improve stability electrode materials. Whereas, target materials conventionally need dissolved in aqueous solution obtain precursor composites subsequently calcined at a temperature during process, which could destroy phase structure as result sodium leaching into water thermal decomposition temperature. In this work, we propose facile method construct ZnO surface layer on utilizing ethanol solvent mild post-treatment effectively enhances induces formation stable interface PW. PW-5 wt % ZnO-E (exposed 60% humidity after 30 days) cathode demonstrates much higher retention (94.1%) 1 C 200 cycles than that PW-E (54%). This work lays solid foundation further