Cathode Materials Processing Technology

Lithium compounds used in lithium batteries have specific particle size distribution requirements, and the use of ultra-fine lithium powder can improve battery performance, including higher available capacity, longer service life, faster charging rate, higher efficiency, consistent discharge rate, and reduced size and weight. 

Typical materials of cathode materials for lithium-ion batteries:Lithium cobalt oxide, lithium manganate, lithium iron phosphate, ternary materials, lithium carbonate, lithium nickel cobalt aluminate, cobalt oxide, cobalt dioxide, lithium hydroxide, etc.

China Minmetals
Ronbay Material

Impact Mill Grinding Process

Material include: Lithium cobaltate (LCO), Li(OH), lithium manganate, lithium iron phosphate (LFP), ternary materials (NCM), lithium carbonate (Li2CO3), lithium nickel cobalt manganate (NCM), lithium nickel cobalt aluminate (NCA), cobalt oxide, lithium titanate, cobalt dioxide, Lithium cobalt oxide, etc.

The material is uniformly sent into the grinding chamber by the feeding system, and is strongly impacted by the high-speed rotating grinding disc. At the same time, it is subjected to the centrifugal force to collide with the crushing ring gear, and is subjected to various comprehensive forces such as shearing, friction, and collision.

The material is ground, and the crushed material moves to the classification area with the airflow. The coarse and fine materials are separated through the classification wheel adjusted by the frequency conversion. The products that meet the fineness requirements enter the cyclone collector and the dust collector with the airflow for collection, and the coarse particles return to the grinding area to continue shattered.

– Whole ceramic protection,no magnetic substance.
– Optimized milling assemble,good ball shape,high bulk density.
– Humanization design,easy to change parts.
– Closed-loop system,no moisture increasing,nitrogen circle system available, extremely low oxygen content.
– Machine large change to meet different capacity requirement.
– Sintered plate filter available,filtering precision 0.1um and collecting rote up to 99.99%.
– Processing parameter memory and historical record query(intelligent control).
– Whole rotor with sintered zirconium aluminum ceramic.
– Separated zirconia ceramic gear ring.
– Customized zirconia sintered hammer.
– Whole air deflector.
– Discharge pipe upgrade to whole ceramic liner pipe.
– Imported LINATEX liner.
– No copper and zinc parts.
– Inner chamber of blower with SS304 coated PTFE.
– Return pipe anti-metal processing.
– PLC automatic control.
– Running:vibration sensor,temperature sensor.
– Validation document available.

ModelCapacity and Size of LCOCapacity and Size of LMOCapacity and Size of LFPCapacity and Size of NCM
CSM350-VD100-150kg/h D50:10-15μm70-80kg/h D50:8-10μm90-100kg/h D50:5-8μm100-150kg/h D50:8-12μm
CSM450-VD200-300kg/h D50:10-15μm200-250kg/h D50:8-10μm180-200kg/h D50:5-8μm300-400kg/h D50:8-12μm
CSM510-VD600-800kg/h D50:10-15μm500-700kg/h D50:8-10μm300-400kg/h D50:5-8μm600-800kg/h D50:8-12μm

Fluidized Bed Jet Mill Grinding Process

Suitable materials include: lithium iron phosphate, single crystal ternary, small particle lithium cobalt oxide, lithium hydroxide, lithium carbonate, etc.

After the compressed air is filtered and dried, it is sprayed into the grinding chamber at high speed through the Laval nozzle. At the intersection of multiple high-pressure airflows, the materials are repeatedly collided, rubbed, and sheared to be crushed. The crushed materials rise with the suction of the fan. The airflow moves to the classification zone. Under the action of the strong centrifugal force generated by the high-speed rotating classification turbine, the coarse and fine materials are separated.The fine particles that meet the particle size requirements enter the cyclone separator and dust collector through the classification wheel for collection, and the coarse particles descend to the crushing zone and continue to be crushed.

– Achieve full ceramization, no magnetic substance.
– Overall sintering ceramic rotor up to the world’s advanced level, the line speed up to 65m/s.
– Zirconia ceramic nozzle.
– Australia imports LINATEX protection,seamless protection,wear- resistant.
– Recoil gas mantle sealing disc is sintered overall.
– German standards automatic controlling technology.
– Mettler Toledo weight sensor,precise control the feeding amount.
– Automatic regulator valve, pulverizer inlet pressure controlling constantly.
– Pressure difference sensors and automatic adjusting throttle, maintaining the stability of the system resistance.
– Siemens PLC automatic control, product quality consistent and stable.

Particle sizeD50:4±0.5μmD50:5-6μmD50:5-6μm
MQW20 Capacity200-250kg/h350-400kg/h250-300kg/h
MQW40 Capacity400-500kg/h800-1000kg/h500-600kg/h
MQW80 Capacity800-1000kg/h1200-1500kg/h1000-1200kg/h
MQPW20 Capacity250-300kg/h2400-3000kg/h2000-2500kg/h

Spiral Jet Mill Grinding Process

Especially suitable for grinding single crystal ternary materials and small particle lithium cobalt oxide.

– Different from the ordinary fluidized bed jet mill, Spiral jet mill’s multiple nozzles to form multiple vortex, material collision grinding, high energy utilization.
– The new spiral jet mill equip with Classifier which is especially suitable for grinding single crystal ternary materials and small particle lithium cobalt oxide.
– Low energy consumption, energy saving more than 20%.
– Compact machine, convenient maintenance and small floor space.
– The residence time in the grinding chamber is shorter, the surface damage is small, and the electrical performance is good.
– Spiral progressive grinding force, secondary shaping of particles, sphericity is better than fluidized bed jet mill.

ModelCapacity(Ternary Material)Air consumption
MQPW10D50:3.5-4μm 100-150kg/h10m³/min
MQW10D50:3.5-4μm 50-100kg/h10m³/min
MQPW15D50:3.5-4μm 200-250kg/h15m³/min
MQW15D50:3.5-4μm 100-150kg/h15m³/min
MQPW20D50:3.5-4μm 300-400kg/h20m³/min
MQW20D50:3.5-4μm 300-400kg/h25m³/min

For Lithium Iron Phosphate
( LiFePO4 )

ALPA provides a special impact mill to meet the needs of ultra-fine, ultra-purity & big production capacity.

Since 2020, benefiting from technological breakthroughs in the density of lithium iron phosphate batteries, lithium iron phosphate batteries have been increasingly favored by battery manufacturers. Its cost advantage and safety and stability have been recognized by the market again. Many mid-to-high-end models that only use ternary batteries, such as Tesla, have also begun to install lithium iron phosphate batteries.

  • The grinding disc could run at speed to meet the linear velocity of 120m/s, the extremely high grinding kinetic energy enables the iron-lithium to be instantly dispersed and milled; single machine meets 1T/H-1.5T/H capacity.
  • The equipment with the same hierarchical structure of jet mill meets the D50 and Dmax requirements of iron-lithium.
  • Gas circulation process (nitrogen, air) to meet the water content requirements of the iron-lithium process.
  • Optimize design of grinding and classification flow field, high efficiency and energy saving.
  • The actual production experience of the largest Chinese impact mill (CSM1500-H) and years of accumulation and precipitation in the industry.

Inert Atmosphere Protection
Grinding / Classifying System

The closed cycle system of grinding and classification is a process that using inert gas (N2, Ar, CO2, etc.), it is especially developed by ALPA for grinding and classifying the inflammable, explosive, oxidizing and hygroscopic materials. The system is update from common mill/classifier system, mainly compose of the feeding system, grinding system or air classification system, gas circulation system, control system.

– Grinded by impact between materials, suitable for material at Mohs hardness 1-10.
– Low abrasion and no metal contamination.
– Inert gas can be changed according to materials.
– Purity of inert gas can be precisely controlled according to the requirement of product.
– Closed loop system, minimum inert gas consumption.
– Air sealing system brings classify accurateing.
– Accurate classifying thanks to high efficiency classifying rotor.
– Particle size adjustable between 2-74μm.
– Classifying flow distribution technology brings high grinding performance and narrow particle size distribution.
– The whole system is running under negative pressure.
– Dust on filter bag is cleaned by automatic impulse.
– Filtration rate can reach 99.99%.
– Back up filter behind dust collector to prevent dust entering air compressor.
– Automatic PLC control system for the plant. Simple operation.