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Safety Information

939773

Sigma-Aldrich

Sodium difluorophosphate

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99.5% trace metals basis, ≤200 ppm acid, anhydrous, battery grade

Synonym(s):

NaDFP battery additive, Sodium phosphorodifluoridate

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About This Item

Empirical Formula (Hill Notation):
F2O2P·Na
CAS Number:
15587-24-3
Molecular Weight:
123.96
UNSPSC Code:
12352107

grade

battery grade

Quality Level

100

Assay

99.5% trace metals basis

form

powder

impurities

≤200 ppm acid
≤200 ppm free acid
≤250 ppm H2O

solubility

soluble (carbonates: soluble(lit.))
soluble (ethers: soluble(lit.))

anion traces

chloride (Cl-): ≤10 ppm
sulfate (SO42-): ≤10 ppm

cation traces

Ca: ≤10 ppm
Fe: ≤10 ppm
K: ≤10 ppm
Li: ≤10 ppm

application(s)

battery manufacturing

SMILES string

[Na].O=P(F)(F)O

General description

Our battery grade sodium difluorophosphate (NaDPF) is a high-purity, anhydrous compound, synthesized carefully to reduce trace acid, chloride, and sulfate impurities. The crystalline NaDPF is soluble (up to ~1 wt.%) in carbonate blends used in battery electrolytes, like ethylene carbonate and dimethyl carbonate.

Application

Sodium difluorophosphate is used in sodium-ion battery research in liquid electrolyte formulations as an additive. It is intended to optimize the performance and stability of sodium-ion batteries. When used as an additive in the liquid electrolyte, it has been shown to improve the efficiency of sodium metal deposition and dissolution, reduce overpotential, and enhance the stability of the solid-electrolyte interphase (SEI) layer on the negative electrode, leading to high coulombic efficiency, excellent rate capability, and long cycle life.

Pictograms

Corrosion
GHS05

Signal Word

Danger

Hazard Statements

H314

Hazard Classifications

Eye Irrit. 2 - Skin Corr. 1B

Storage Class Code

8A - Combustible corrosive hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Information

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Certificates of Analysis (COA)

Lot/Batch Number
MKCW8462

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Sodium difluorophosphate: facile synthesis, structure, and electrochemical behavior as an additive for sodium-ion batteries
Huan Yang
Journal of Material Chemistry A, 9, 3637-3647 (2021)

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Role of Advanced Electrolytes in Sodium Ion Batteries

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