Lithium iron phosphate (LFP) cathode manufacturing consists of two major stages: high-temperature synthesis (calcination), and post-synthesis dry powder processing. The full plant also includes raw material handling, impurity control, quality testing, safety & utility systems. Below is the complete equipment list, organized by process sequence.
1. Raw material batching & pre-mixing system
This stage prepares the precursors: iron source, lithium source, phosphorus source, carbon source and dopants.
- Raw material silos (moisture-proof, dust-tight)
- Loss-in-weight feeding systems for precise proportional dosing
- High-speed wet mixer / kneader (for slurry mixing of precursors)
- Sand mill (wet bead mill for precursor fine dispersion, optional)
- Spray dryer: converts mixed slurry into spherical precursor powder before calcination
2. Calcination / sintering equipment (core synthesis section)
LFP forms its crystal structure during high-temperature roasting under inert atmosphere.
- Roller hearth kiln (most widely used for mass LFP production)
- Pusher kiln / rotary kiln (for alternative production routes)
- Nitrogen generation & supply system (N₂ inert protection, prevents oxidation)
- Kiln temperature control PLC, atmosphere monitoring, exhaust gas treatment
- Kiln cooling section: controlled slow cooling to avoid crystal damage
3. Post-calcination dry processing line (the section covered on lfp-mill.com)
Calcined LFP clinker forms soft agglomerates. This step de-agglomerates, controls PSD and removes metal impurities.
- Pre-treatment
- Crusher / coarse disintegrator: break large sintered chunks
- Vibrating sieve: remove oversized hard blocks
- Magnetic separator (pre-magnet): remove ferromagnetic impurities
- Grinding & classification host (choose one main route)
- JCSM air classifier mill: high-capacity dry de-agglomeration for mass production
- JFJM fluidized bed jet mill: ultra-low metal contamination for high-end grades
- Auxiliary powder handling for grinding circuit
- Loss-in-weight screw feeder
- Negative-pressure air circuit: cyclone collector, pulse dust collector, induced draft fan
- Secondary magnetic separator after grinding
- Buffer silos and ceramic-lined powder conveying pipelines
- Compressed air system (only required for jet mill lines: air compressor, freeze dryer, precision filter, air tank)
4. Finishing, packaging and material conveying
- Finished powder storage silos (anti-static, low-humidity design)
- Automatic powder packing machine with nitrogen purging
- Pneumatic conveying system (closed, ceramic-lined transfer pipes)
- Metal detector for final impurity inspection
5. Laboratory & quality control testing equipment
For batch quality verification before delivery to battery factories:
- Laser particle size analyzer (PSD: D50, D97)
- Tap density tester
- BET specific surface area analyzer
- ICP elemental analyzer: test metal impurities (Fe, Cu, Cr, Ni etc.)
- Carbon content tester
- Moisture analyzer
- Powder rheology test equipment
- XRD (X-ray diffractometer): check crystal phase purity
6. Utility, safety and environmental protection systems
- Nitrogen generator / liquid nitrogen storage tank
- Chiller & cooling water system
- Explosion protection system: spark detection, explosion venting, static grounding network
- Waste gas treatment system for kiln exhaust
- Dust collection systems for all powder transfer points
- Central PLC & SCADA control system for full-line monitoring and data traceability
Two typical production route comparison
- Wet precursor + spray drying + roller kiln calcination + dry de-agglomeration (mainstream commercial route)
Uses spray dryer + roller kiln + JCSM air classifier mill. High throughput, stable particle morphology, lower operating cost for GWh-scale cathode plants. - Alternative route: wet precursor + calcination + JFJM jet mill
Preferred when ultra-low metal impurity is the top priority, with smaller capacity and higher energy consumption.
LFP cathode manufacturing equipment covers raw material mixing, spray drying, high-temperature calcination, post-calcination dry grinding/classification, impurity removal, powder storage, automatic packaging and QC lab instruments. The dry grinding-classification system (JCSM or JFJM) defines the final powder PSD, tap density and impurity level, which directly influence battery cell performance.
