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Product Code B3471-25g
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A perfluorobutyl sulfonate salt

Directly applied as an additive in perovskite solar cells and lithium batteries, and serving as a precursor for ionic liquids


Potassium nonafluoro-1-butanesulfonate (CAS number 29420-49-3) is a potassium salt of perfluorobutyl sulfonic acid. The sulfonate group can coordinate to metal centres, acting as an anchoring unit. Therefore, potassium nonafluoro-1-butanesulfonate is commonly used as an interface additive in lithium-ion batteries and perovskite solar cells. It forms a stable passivation layer on cathode material, LiNi0.5Mn1.5O4 (LNMO), leading to minimum capacity decay after 1000 cycles at 1C and 5V. Potassium nonafluoro-1-butanesulfonate adjusts the energy matching of SnO2 electron transport layer and the perovskite in perovskite solar cells. It assists in the passivation of the defects at the interface, resulting in an increase in powder conversion efficiency (PCE) from 20.6% to 23.2%.

Potassium nonafluoro-1-butanesulfonate is also employed in the synthesis of ionic liquids, in cooperation with pyrrolidinium salts. These ionic liquids modify the surface of the cathode materials in lithium batteries with enhanced stability and performance.

used as an additive

Enhance stability and performance

used as an additive

Fluorinated potassium butanesulfonate building block

Fluorinated potassium butanesulfonate building block

for ionic liquid, perovskite solar cells, and battery research

competitively priced 29420-49-3

Low Cost

Competitively priced, high quality product

High purity 29420-49-3

High purity

>98% High purity

General Information

CAS Number 29420-49-3
Chemical Formula C4F9KO3S
Full Name Potassium 1,1,2,2,3,3,4,4,4-nonafluoro-1-butanesulfonate
Molecular Weight 338.19 g/mol
Synonyms Potassium nonaflate, Potassium nonafluorobutanesulfonate, Potassium perfluorobutanesulfonate, KPBS
Classification / Family Fluorinated building blocks, Sulfonate anchoring units, Perfluoroalkyls, Ionic liquids, Batteries, Perovskite solar cells, Solid additives

Chemical Structure

Potassium nonafluoro-1-butanesulfonate chemical structure, CAS 29420-49-3
Potassium nonafluoro-1-butanesulfonate chemical structure, CAS 29420-49-3

Product Details

Purity 98%
Melting Point Tm > 280 °C
Appearance White powder

MSDS Documentation

Potassium nonafluoro-1-butanesulfonatePotassium nonafluoro-1-butanesulfonate MSDS Sheet

Literature and Reviews

  1. One thousandth of quaternity slurry additive enables one thousand cycle of 5V LNMO cathode, J. Zhang et al., Energy Storage Mater., 64, 103060 (2024); DOI: 10.1016/j.ensm.2023.103060.
  2. High-performance pyrrolidinium-based poly(ionic liquid) binders for Li-ion and Li-air batteries, S. Vauthier et al., Mater. Today Chem., 27, 101293 (2023); DOI: 10.1016/j.mtchem.2022.101293.
  3. Multifunctional molecule of potassium nonafluoro-1-butanesulfonate for high-efficient perovskite solar cells, Z. Wu et al., J. Chem. Eng., 449, 137851 (2022); DOI: 10.1016/j.cej.2022.137851.
  4. A long-lasting dual-function electrolyte additive for stable lithium metal batteries, D. Wang et al., Nano Energy, 79, 104889 (2020); DOI: 10.1016/j.nanoen.2020.104889.
  5. N-methyl-N-alkylpyrrolidinium nonafluoro-1-butanesulfonate salts: ionic liquid properties and plastic crystal behaviour, S. Forsyth et al., Green Chem., 8, 256–261 (2006); DOI: 10.1039/B512902H.

To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.

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