Product Structure and Specification Design
Customized design for the production process of lithium battery materials, suitable for different furnace types and production capacity requirements:
Basic structure: divided into two categories: cylindrical crucible and square (material holding box), including matching covers and bases. Excellent sealing performance prevents atmosphere leakage.
Size specifications：
Cylindrical type： diameter φ40~φ500mm, height 100~800mm, wall thickness 8~30mm
Square： 200×200×50mm~600×600×200mm, can be customized for special sizes
Wall thickness optimization： based on usage temperature and lifespan requirements, a gradient wall thickness design is adopted, balancing thermal conductivity efficiency and structural strength.
Special design： customizable structures with flow channels, partition barriers, built-in temperature measurement holes, etc., suitable for specific process requirements.
Applicable Industries and Application Scenarios
Lithium battery-specific graphite crucibles are the core equipment for the production of new energy battery materials. They are suitable for different material systems and process stages:
1. Production of lithium battery positive electrode materials
Application process: High-temperature sintering of lithium iron phosphate, ternary materials (NCM/NCA), lithium cobalt oxide, lithium manganese oxide, etc. (700~1000℃)
Suitable furnace types: belt furnace, pusher plate furnace, box furnace, atmosphere-protected furnace
Core value: Stable material composition, low impurity content, good batch consistency, improving battery capacity and cycle life
Common specifications: Square crucible 300×300×80mm~500×500×150mm, cylindrical φ150~φ300mm
Production of lithium battery anode materials
Application process: Pre-carbonization (800~1200℃) and graphitization (2000~2800℃) of artificial graphite, mesocarbon microbeads (MCMB), hard carbon/soft carbon, etc.
Applicable furnace types: Acheson furnace, graphitization furnace, vacuum resistance furnace
Core value: Good high-temperature stability, no impurity pollution, ensuring the conductivity and charging-discharging performance of the anode materials
Common specifications: Cylindrical φ200~φ500mm, square crucible 400×400×100mm~600×600×200mm
Other production of new energy materials
Application scenarios: Solid-state battery electrolytes, battery separator coating materials, conductive agents, etc. for high-temperature processing
Applicable furnace types: Vacuum sintering furnaces, tubular furnaces, high-frequency induction furnaces
Core value: Corrosion resistance, high temperature resistance, high cleanliness, meeting the requirements for the preparation of special materials
Quality inspection and qualification certification
Raw material inspection: All raw materials are thoroughly inspected upon entering the factory for purity, ash content, and sulfur content. They can only be used after passing the inspection.
Process control: Density and size are tested after molding; resistance is tested for each graphiteized piece; internal cracks are detected through ultrasonic testing.
Finished product inspection: Before leaving the factory, mechanical strength, purity, and dimensional accuracy are tested. Each batch's inspection report is provided.
Related qualifications: The enterprise has passed ISO 9001 quality management system certification and ISO 14001 environmental management system certification; the products comply with RoHS and REACH environmental requirements; MSDS, material certificates, and third-party test reports can be provided.
Storage, Handling and Usage Specifications
1. Storage Requirements
Store in a dry and ventilated warehouse with a relative humidity of ≤60% and a temperature of 5~35℃. Keep away from acids, alkalis, moisture and sharp objects.
Place horizontally on wooden pallets. Do not stack more than 3 layers to prevent deformation and impact.
2. Handling and Lifting
Use flexible ropes or special fixtures for lifting. Do not directly bind with steel wire ropes, throw or collide.
During transportation, handle with care to avoid damage to the end faces and threads, and protect the integrity of the coating.
3. Installation and Usage
Before the first use, preheat at 100~150℃ for 24 hours to completely remove adsorbed moisture and prevent cracking under high temperature.
Ensure the sealing surfaces are clean during assembly. Use special sealing materials to ensure the sealing performance of the atmosphere.
Control the heating rate according to process requirements (≤300℃/h) to avoid thermal shock damage.
Regularly inspect the surface coating and structural integrity. Remove surface adherents in time to extend the service life.
Customized service
In response to the special processing requirements of customers, we offer comprehensive customized solutions:
Size customization: Non-standard diameters / lengths (φ40~φ500mm, 200~600mm), special heights (50~800mm)
Performance customization: Ultra-high purity type (ash content ≤ 0.01%), high-temperature resistant type (up to 2800℃), anti-oxidation coating type (Si₃N₄/SiC/ZrB₂)
Structural customization: With guide channels, partition barriers, built-in temperature measurement holes, special sealing surface designs, etc.
Batch customization: According to the customer's production capacity requirements, we provide large-scale customized production to ensure supply stability.
| Crucible Type | Average Service Life | Material Contamination Rate | Comprehensive Cost (CNY per Ton of Material) | Cost Advantage |
|---|---|---|---|---|
| High-purity Isostatic Graphite Crucible for Lithium Battery | 300 ~ 500 batches | ≤ 0.001% | 850 ~ 1200 | Benchmark |
| Ordinary Graphite Crucible | 100 ~ 200 batches | ≥ 0.01% | 1500 ~ 2000 | Cost reduced by 40% ~ 50% |
| Ceramic Crucible | 50 ~ 100 batches | 0.005% ~ 0.01% | 2000 ~ 2500 | Cost reduced by 60% ~ 70% |
| Test Item | Unit | Standard Type (STD) | High Temperature Type (HT) | Test Standard |
|---|---|---|---|---|
| Fixed Carbon Content | % | ≥ 99.95 | ≥ 99.98 | GB/T 3521-2023 |
| Ash Content | % | ≤ 0.03 | ≤ 0.02 | GB/T 3521-2023 |
| Bulk Density | g/cm³ | ≥ 1.80 | ≥ 1.82 | GB/T 24525-2009 (Hydrostatic Method) |
| Electrical Resistivity | μΩ·m | ≤ 6.5 | ≤ 6.0 | ASTM C611 (Four-probe Method) |
| Compressive Strength | MPa | ≥ 45 | ≥ 48 | GB/T 14390-2008 |
| Flexural Strength | MPa | ≥ 10.5 | ≥ 11.0 | GB/T 14390-2008 (Three-point Bending Method) |
| Open Porosity | % | 18 ~ 22 | 16 ~ 20 | GB/T 24525-2009 |
| Thermal Conductivity (20℃) | W/(m·K) | 120 ~ 140 | 140 ~ 150 | ASTM C480 |
| Coefficient of Thermal Expansion (20~1000℃) | 10⁻⁶/℃ | ≤ 4.0 | ≤ 3.5 | Dilatometer Test |
| Max. Operating Temperature | ℃ | 1600 ~ 2000 | 2000 ~ 2800 | Thermal Analysis Test |
| Thermal Shock Cycles (1000℃ → 25℃) | Cycles | ≥ 30 | ≥ 50 | Thermal Shock Test Method |
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