Makes batteries safer: AERODISP® dispersion products

Increase the safety of batteries with a metal oxide dispersion!

AERODISP® and VP Disp. (experimental grades) ready-to-use solutions are used to prepare thin ceramic coatings on top of separators for lithium-ion batteries.

State-of-the-art lithium-ion batteries require a separator between the anode and cathode that not only prevents a short circuit but also allows Li-ions to flow through. Shifts in temperature can reduce the safety performance of the microporous, polymer-based separator, which could cause a short circuit and risk electrolyte inflammation. A thin ceramic separator coating made of AEROXIDE® fumed alumina reduces the thermal shrinkage and increases cell safety.

Our fumed alumina dispersions enable the preparation of ultra-thin (≤ 1 μm), homogenous ceramic coatings, which is not possible using conventional coarser particles.

Evonik offers commercial AERODISP® and experimental VP Disp. dispersion products for the preparation of reliable separator coatings. High-quality dispersion powders and our many years of expertise in dispersion chemistry means you can expect:

  • stable, highly filled fumed alumina dispersions (up to 50 wt%),
  • uniform and small particle size distribution (< 300 nm) and
  • low viscosity for easy processing

The following table contains recommended fumed alumina dispersions for different requirements:

Product Name

Solid Content [wt%]

Particle System

Surface Charge

pH Value

AERODISP® W 440

40

AEROXIDE® Alu 65

positive

3.0 - 5.0

VP Disp. W 4150 

50

fumed alumina with lower surface area

positive

3.0 - 5.0

AERODISP® W 450 ZX

50

AEROXIDE® Alu 65

negative

6.0 - 9.0

VP Disp. W 450 XC6

50

AEROXIDE® Alu 65

negative

8.0 - 10.0

VP Disp. W 4150 XC6

50

fumed alumina with lower surface area

negative

8.0 - 10.0

If you have questions about the differences between grades, or application as a separator coating, contact Evonik’s experts. Our dispersions can be specifically designed to meet your requirements.

Further information can be found here: