Specific Electrolyte for Long-Cycling Sodium-Ion Battery (Polyanion Cathode + Hard Carbon), 200 g/bottle, CLCSIBSEPCHC
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Add-Ons
For a polyanion cathode—such as Na3V2(PO4)3 (NVP), Na3V2(PO4)2F3 (NVPF), or Na4Fe3(PO4)2(P2O7) (NFPP)—paired with a Hard Carbon (HC) anode, the electrolyte formulation differs significantly from layered oxide (NFM/NMC) systems. Polyanion frameworks are covalently bonded via robust (PO4)^{3-} units, eliminating catastrophic transition-metal leaching and high-voltage oxygen evolution. Consequently, the bottleneck shifts to anode SEI passivity at low potentials (<0.1 V vs. Na/Na+), suppressing parasitic gas evolution during high-voltage holds (>3.8–4.2 V for NVPF), and enabling ultra-long cycle life (>3,000–5,000 cycles).
The key formulation mechanics are: (1) Dual-Salt Synergy (NaPF6 + NaFSI) for NVP/NFPP: Pure NaFSI causes anodic pitting corrosion of the aluminum current collector above 3.6 V vs. Na/Na+. Keeping NaPF6 as the majority salt (0.8M) forms an impermeable, passivating AlF3 surface layer. The flexible, inorganic-rich decomposition products of FSI- (Na2S2O4, Na2S, NaF) lower the charge-transfer resistance (R_ct) at the hard carbon surface, preventing sodium metal plating during high-rate charging (>3C). (2) FEC Content Ceiling: Unlike layered oxides where FEC causes harmful transition metal crossover, polyanion full cells tolerate FEC better. However, in ultra-long-cycling cells (>3,000 cycles), excess FEC (>5 wt%) will continuously degrade and release CO2 gas, causing pouch cell swelling. Keep FEC strictly between 1.0 and 2.0 wt% for NVP/NFPP (3.4 V cutoff) and 2.5–3.5 % for NVPF (4.2 V cutoff). (3) Ether Electrolytes for NVP//HC (High-Power Alternative): If the application prioritizes ultra-high power, low-temperature performance (down to -40°C), and cycle life (>6,000 cycles) over high-temperature storage.
| Part Number |
CLCSIBSEPCHC (C-LCSIB-SE-PCHC) |
| Appearance |
Colorless Liquid |
| Electrolyte Composition |
Undisclosed recipe from leading manufacturer that has been well demonstrated in pilot-scale SIB. |
| Humidity Level |
<20 ppm |
| Acid Level |
<100 ppm |
| Performance |
>90% capacity retention after 1,000 cycles at 1C (2.0–3.6 V) (for reference only) |
| Package Size | 200 g/bottle |
Notes: Please store the specific SIB electrolyte in the glovebox due to its sensitivity to humidity.
References:
- L. Cheng, et al. Hard Carbon Wrapped Na3V2(PO4)3@C Porous Composite Extending Cycling Lifespan for Sodium-Ion Batteries, ACS Appl. Mater. Interfaces (2017) 9 (51): 44485–44493.
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Z. Zou, et al. Integrated polyanion-layered oxide cathodes enabling 100 000 cycle life for sodium-ion batteries, Energy Environ. Sci. (2025) 18 (5): 2216–2230.