Continuous Production\nof High-Capacity Iron-Based\nPrussian Blue Sodium-Ion Cathode Materials Using a Rotor–Stator\nSpinning Disk Reactor

Abstract

Iron-based Prussian blue materials have the potential\nto be used\nas low-cost, simple-to-synthesize, and high-capacity cathode materials\nfor large-scale energy storage sodium-ion batteries. However, in order\nto obtain high-capacity sodium storage Prussian blue materials, the\ncurrently used high-energy hydrothermal method or interstitial coprecipitation\nmethod is difficult to meet large-scale energy storage applications.\nThe electrochemical performance of the product is highly dependent\non the crystallization process. In this work, a simple stator–rotor\nreactor (RSSDR) reactor and precipitation transformation were used\nto improve the crystallization and precipitation process of iron-based\nPrussian blue, and continuous production was realized. The effects\nof particles with different morphologies on the products after aging\nwere investigated, and the specific capacity (162.4 mAh g^–1 at 34 mA g^–1) and cycle retention rate (capacity\nretention of 64.97% for 200 cycles at the current density of 170 mA\ng^–1) of iron-based Prussian blue were improved.\nOverall, this work provides a strategy to continuously produce iron-based\nPrussian blue sodium-ion cathode materials with improved electrochemical\nperformance through improving the crystallization process.