Specific Electrolyte for Sodium-Ion Battery (Prussian Blue + Hard Carbon), 200 g/bottle, CSIBSEPBHC

Pairing a Prussian Blue analog (PBA) cathode—such as Na{2-x}Fe[Fe(CN)6] with a Hard Carbon (HC) anode presents an electrolyte challenge distinct from layered oxides and polyanions: (1) Interstitial Water & HF Catalysis: Even "zero-strain" PBAs retain coordinate/zeolitic crystal water (1–3 wt%), which hydrolyzes standard PF6^- salts into corrosive HF. HF strips transition metals (Fe^{2+}/Mn^{2+}) out of the cyanide framework. (2) Cyanide Cage Dissolution & Cross-Talk: Solubilized transition metal cyanides migrate to the negative electrode, poisoning the hard carbon Solid Electrolyte Interphase (SEI). (3) Severe Gas Evolution: High surface water and high-spin Mn/Fe catalytic sites induce continuous oxidative electrolyte breakdown andCO2/CO/HCN gassing if not passivated.

For PBA system, NaClO4 is insensitive to hydrolysis, forming zero acidic fluorides. In laboratory and pre-commercial pouch cells, NaClO4 consistently yields superior capacity retention with PBAs. NaFSI resists H2O breakdown far better than NaPF6, but high-purity cells need at least a small fraction of NaPF6 (or LiDFOB/fluorinated additives) to prevent anodic pitting of the aluminum cathode current collector above 3.6 V vs. Na/Na+.

Notes: Please store the specific SIB electrolyte in the glovebox due to its sensitivity to humidity.

References: 

1. C. Zhao, et al. Solvation-tuned ternary eutectic electrolyte for stable Prussian blue-based sodium-ion batteries, Chemical Engineering Journal, 2026, 527, 171476
2. T. N. Tran, et al. Tailoring electrolyte solvation structure to enhance rate capability, cycle life, and safety in Prussian-blue-based sodium-ion battery, Nano Energy, 2026, 153, 111919.