APPLICATIONS OF UNION PROCESS MILLS
FOR THE LITHIUM-ION
BATTERY
INDUSTRY
Grinding Principle
The Attritor is a high energy
internally agitated media mill.
The Attritor utilizes a rotating
agitator shaft which efficiently
imparts energy to the grinding
media, creating kinematic porosity
and random media movement
throughout the entire grinding
chamber.
Both impact and shear forces
are created in this “chaotic” state
of motion. The grinding media and
particles move randomly, colliding
and impinging upon each other
resulting in highly efficient grinding
and/or thorough and complete
dispersion.
IRREGULAR MOVEMENT
GROUP MOVEMENT
Movement of media and particles
Lithium Iron Battery
applications utilize
a 2 phase process:
Phase 1
– Lithium Iron
Phosphate
Precursor
Application (Wet or Dry):
For both wet and/or dry
milling applications in the
lithium iron battery industry,
the S-series Attritors are
utilized in a 2-phase process.
The first phase involves
grinding and thoroughly
dispersing coarse powder(s)
down to the 1-3 um particle
size range in an S-series
mill from Union Process,
Inc. Phase 1 processes can
be either “wet” utilizing the
S-series
Attritor or “dry”
utilizing the
SD-series
Attritor.
Phase 2
– Lithium Iron
Battery
Finished
Material
Application (Wet):
The
DMQ series
horizontal
circulation mill is utilized
in phase 2 for complete
and thorough dispersion of
agglomerated material to the
primary particle size range of
200-300nm.
Case Study
S-Attritors to grind lithium iron
phosphate precursor material:
Material: Lithium iron phosphate precursor
Feed size: D50=100µ
End size: D50<2µ
Grinding time: 1 hr
Solvent: Alcohol
Particle Size Analysis After Milling in S-Attritor
DMQ-Mills to grind lithium iron
phosphate precursor material:
Particle Size Analysis After Milling in DMQ Mill
From S-Attritor:
Material: Lithium iron phosphate precursor
Feed size: D50<2µ
End size: D50<150nm
Grinding time: 3 hrs
Solvent: Alcohol
Particle Size
Percent %
Percent %
Particle Size
1 2