Active LiFePO4 Particles: Tap Density 1.2-1.6 g/cm³

Q: Why are LiFePO4 particles considered safer than other cathode materials?

LiFePO4 has exceptional thermal and chemical stability due to strong P-O covalent bonds in the olivine structure. It doesn't release oxygen at high temperatures (unlike layered oxides), preventing thermal runaway. The stable 3.2V plateau also reduces risk of lithium plating.

Q: What determines the rate capability of LiFePO4 particles?

Rate capability depends on particle size (smaller particles = shorter diffusion paths), carbon coating quality (electronic conductivity), and crystal orientation. Optimal carbon coating (1-3%) creates conductive networks while maintaining lithium diffusion pathways.

Q: How does particle morphology affect battery performance?

Spherical particles provide better packing density and electrode uniformity. Irregular particles may offer higher surface area but poorer processing characteristics. Nano-sized particles enhance rate capability but may reduce tap density and increase electrolyte decomposition.

Component Specifications

Definition

Active LiFePO4 (Lithium Iron Phosphate) particles are crystalline nanomaterials that serve as the primary cathode active material in LFP batteries. These particles possess an olivine crystal structure (space group Pnma) that provides stable lithium-ion diffusion pathways. Their electrochemical activity stems from the reversible redox reaction between Fe²⁺/Fe³⁺ during charge/discharge cycles, with lithium ions moving in and out of the crystal lattice through one-dimensional channels. Particle size distribution (typically 50-500 nm), morphology (spherical or irregular), and carbon coating quality directly determine battery performance metrics including specific capacity, rate capability, and cycle life.

Working Principle

Operates through electrochemical intercalation/deintercalation mechanism. During charging, lithium ions extract from LiFePO4 particles (forming FePO4) and migrate through electrolyte to anode. During discharging, lithium ions re-insert into the crystal structure (reforming LiFePO4). The olivine structure provides stable framework with minimal volume change (<2%) during cycling, while carbon coating enhances electronic conductivity.

Materials

Lithium iron phosphate (LiFePO4) with olivine crystal structure, typically carbon-coated (1-3 wt% carbon) to improve conductivity. May contain dopants (e.g., Mg, Zn, Ti) for enhanced ionic conductivity. Purity: >99.5% for battery-grade materials.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tap Density	1.2-1.6 g/cm³
Iron Content	35-36 wt%
Particle Size	50-500 nm (D50 typically 100-200 nm)
Carbon Content	1-3 wt%
Lithium Content	4.4-4.5 wt%
Voltage Plateau	3.2-3.4 V vs. Li/Li⁺
Moisture Content	<500 ppm
Specific Capacity	150-165 mAh/g (theoretical 170 mAh/g)
Phosphorus Content	19-20 wt%
Specific Surface Area	10-30 m²/g

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 12405-4, IEC 62660-1, UL 1642, GB/T 30835

Parent Products

This component is used in the following industrial products

Lithium Iron Phosphate Cathode Active Material

Lithium iron phosphate (LiFePO4) cathode active material is a critical raw material in battery manufacturing, serving as the positive electrode component in lithium-ion cells.

View Product Details

Engineering Analysis

Risks & Mitigation

Lithium plating at high charge rates
Capacity fade from iron dissolution
Poor low-temperature performance
Moisture sensitivity leading to HF formation
Carbon coating inhomogeneity

FMEA Triads

Trigger: Insufficient carbon coating
Failure: Poor electronic conductivity leading to capacity loss and voltage drop
Mitigation: Implement controlled carbonization process with in-line Raman spectroscopy monitoring

Trigger: Particle size distribution too broad
Failure: Inconsistent electrochemical performance and electrode coating defects
Mitigation: Use multiple classification steps (air classification, sieving) with laser diffraction monitoring

Trigger: Trace moisture contamination
Failure: HF acid formation degrading electrolyte and causing capacity fade
Mitigation: Maintain <100 ppm moisture in processing environment with continuous dew point monitoring

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Particle size D90/D10 ratio < 3.0, Carbon content ±0.2%, Metal impurities < 50 ppm each

Test Method

XRD for crystal structure, BET for surface area, Laser diffraction for particle size, TGA for carbon content, ICP-OES for elemental analysis

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Supplier transparency

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Manufacturers of Active LiFePO4 Particles

Manufacturer profiles associated with Active LiFePO4 Particles.

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Frequently Asked Questions

Why are LiFePO4 particles considered safer than other cathode materials?