FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU subsidiary.

It looks like you are using an unsupported browser. You can still place orders by emailing us on info@ossila.com, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.


Product Code B3471-25g
Price £50 ex. VAT

A perfluorobutyl sulfonate salt

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


Specifications | MSDS | Literature and Reviews


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.
Return to the top