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933953

Sigma-Aldrich

Sodium difluoro(oxalato)borate

greener alternative

≥99%, battery grade

Synonym(s):

NaDFOB, NaFOB, Sodium difluoro(ethanedioato)borate

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About This Item

Empirical Formula (Hill Notation):
C2BF2NaO4
CAS Number:
Molecular Weight:
159.82
UNSPSC Code:
12352104
NACRES:
NA.21

grade

battery grade

Quality Level

description

Application: Battery manufacturing

Assay

≥99%

form

powder

greener alternative product characteristics

Design for Energy Efficiency
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sustainability

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impurities

≤0.2% H2O

anion traces

chloride (Cl-): ≤50 ppm
sulfate (SO42-): ≤20 ppm

cation traces

Ca: ≤20 ppm
K: ≤20 ppm
Mg: ≤20 ppm

application(s)

battery manufacturing

greener alternative category

SMILES string

O=C1C(O[B-](F)(F)([Na+])O1)=O

General description

Sodium difluoro(oxalato)borate, also referred to as NaDFOB, is a high-purity and low-water content white crystalline powder that has become increasingly popular in the field of battery technology. NaDFOB is the sodium equivalent of lithium difluoro(oxalato)borate and is soluble in polar organic solvents (>1.0 M in carbonates), making it ideal for use in battery electrolytes. It exhibits excellent electrochemical stability, surpassing NaClO4, with NaDFOB-based carbonate electrolytes showing electrochemical stability windows above 5.5V vs Na+/Na. Our NaDFOB is manufactured to the highest standards to ensure its purity, enabling it to be used effectively in a wide range of battery applications.
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Application

Sodium-difluoro(oxalato)borate, anhydrous and battery-grade with a purity of ≥99%, is a versatile electrolyte additive for sodium-ion batteries (SIBs). NaDFOB demonstrates superior compatibility with a range of solvents commonly employed in SIBs, unlike NaClO4 and NaPF6, which exhibit solvent-dependent performances. Additionally, NaDFOB is stable and does not produce any toxic or hazardous substances upon contact with air and water. A recent study found that the incorporation of NaDFOB as an additive significantly enhances the charge-discharge capacity and cycling performance of graphite anodes. Another study suggests that NaDFOB contributes to the formation of a stable solid electrolyte interphase (SEI) film on the surface of graphite anodes, resulting in a highly stable electrolyte/electrode interface. With these benefits, Sodium-difluoro(oxalato)borate is a promising solution for improving the performance and stability of sodium-ion batteries in various applications.

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Sodium Difluoro(oxalato)borate as An Electrolyte Additive to Improve the Electrochemical Performance of Graphite Anode
Yang-yang Yao, et al.
International Journal of Electrochemistry, 21, 387-392 (2015)
Juner Chen et al.
Chemical communications (Cambridge, England), 51(48), 9809-9812 (2015-05-20)
A new electrolyte salt, sodium-difluoro(oxalato)borate (NaDFOB), was synthesized and studied, which enables excellent reversible capacity and high rate capability when used in Na/Na0.44MnO2 half cells. NaDFOB has excellent compatibility with various common solvents used in Na-ion batteries, in strong contrast
Application of Partially Fluorinated Ether for Improving Performance of Lithium/Sulfur Batteries
Lu Hai, et al.
Journal of the Electrochemical Society, 162 (2015)

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