Manganese Sulfate for Lithium Battery Cathodes
1. Overview
Manganese sulfate (MnSO₄) is a key raw material for lithium battery cathode production, especially for NMC (Nickel Manganese Cobalt) and LMO (Lithium Manganese Oxide) systems.
In lithium-ion batteries, manganese contributes to:
Structural stability of cathode crystals
Improved thermal safety
Cost reduction compared to high-cobalt systems
Battery-grade manganese sulfate must meet strict purity and impurity control standards, as trace metals directly affect battery cycle life and safety.
2. Main Applications in Lithium Battery Cathode Materials
2.1 NMC Cathodes (LiNiₓMnᵧCo????O₂)
Manganese sulfate is used as a manganese source during co-precipitation of NMC precursors.
Key functions:
Stabilizes layered crystal structure
Improves thermal stability
Balances cost and energy density
Typical NMC systems:
NMC111
NMC532
NMC622
NMC811 (lower Mn ratio but higher purity requirement)
2.2 LMO Cathodes (LiMn₂O₄)
For LMO batteries, manganese sulfate is converted into high-purity Mn-based precursors.
Key characteristics:
High power output
Excellent safety
Lower material cost
LMO is widely used in:
Power tools
E-bikes
Entry-level EV batteries
Energy storage systems (ESS)
3. Battery-Grade Manganese Sulfate Technical Specifications
Typical Chemical Composition (Battery Grade)
| Item | Specification |
|---|---|
| MnSO₄·H₂O purity | ≥ 99.5% |
| Mn content | ≥ 31.8% |
| Water insolubles | ≤ 0.05% |
| pH (5% solution) | 5.0 – 6.5 |
Impurity Control (Critical for Cathode Performance)
| Impurity | Max Limit |
|---|---|
| Fe | ≤ 5 ppm |
| Cu | ≤ 2 ppm |
| Pb | ≤ 1 ppm |
| Ni | ≤ 3 ppm |
| Co | ≤ 3 ppm |
| Na + K | ≤ 50 ppm |
| Ca + Mg | ≤ 100 ppm |
Even trace levels of Fe, Cu, or Pb can accelerate electrolyte decomposition and reduce cycle life.
4. Particle Size & Physical Properties
| Property | Typical Range |
|---|---|
| Appearance | Pale pink crystalline powder |
| Particle size (D50) | 10–50 μm |
| Bulk density | 0.9–1.2 g/cm³ |
| Solubility in water | Fully soluble |
Uniform particle size ensures:
Stable dissolution during precursor synthesis
Consistent cathode batch quality
5. Performance Impact on Lithium Batteries
High-quality manganese sulfate contributes to:
Longer cycle life
→ Reduced capacity fading caused by metal contaminationImproved safety
→ Better thermal stability under high temperature or overchargeStable cathode morphology
→ Consistent particle growth during co-precipitation
6. Standards & Industry References
Battery-grade manganese sulfate typically complies with:
IEC 62391 – Lithium-ion battery materials
GB/T 1628-2020 – Industrial manganese sulfate (China)
OEM battery-grade specifications (custom limits)
REACH / RoHS compliance for EU markets
COA and batch traceability are essential for large-scale battery projects.
7. Typical Packaging & Supply Format
25 kg plastic-lined bags
1,000 kg jumbo bags (FIBC)
Palletized export packing
Moisture-controlled storage recommended
FAQ – Manganese Sulfate for Lithium Battery Cathodes
Q1. What is the difference between industrial-grade and battery-grade manganese sulfate?
Battery-grade manganese sulfate has much stricter impurity limits, especially for Fe, Cu, Pb, and alkali metals, which directly affect battery life and safety.
Q2. Can manganese sulfate be used for both NMC and LMO cathodes?
Yes. It is widely used in both NMC precursor co-precipitation and LMO material synthesis.
Q3. Why is impurity control so important in lithium batteries?
Trace metal impurities can catalyze electrolyte decomposition, increase internal resistance, and reduce cycle life.
Q4. What particle size is suitable for cathode production?
A D50 range of 10–50 μm is commonly used to ensure stable dissolution and consistent precursor formation.
Q5. Do you provide COA and batch traceability?
Yes. Each batch is supplied with COA, impurity analysis, and lot traceability.
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