This product is mainly applied in the three core processes of pre-carbonization, high-temperature graphitization and purification of artificial graphite anodes. The working temperature can reach up to 2800 - 3000℃. The artificial graphite anode is made from needle-shaped coke and petroleum coke as the precursor. It needs to complete the crystal structure transformation in a sealed high-temperature furnace. The graphite crucible carries the powder materials throughout the process. It is necessary to ensure the uniform heat transfer in the furnace and strictly isolate impurities to avoid material contamination. This directly determines the core electrochemical properties such as purity, conductivity and cycle life of the artificial graphite anode.
Raw materials are selected (needle coke / petroleum coke graphite raw material) → Calcination to remove volatile components → Isostatic pressing / molding → First firing → Ultra-high temperature graphitization at 2800 - 3000℃ → Purification and removal of impurities → CNC precision machining (opening holes, cutting grooves, shaping) → Surface coating (optional) → Comprehensive inspection of size / purity / strength → Vacuum moisture-proof packaging → Finished product.
The entire process strictly controls impurities and strictly prevents the introduction of pollutants during the production process, meeting the extremely clean standards for lithium battery negative electrodes.
Core performance features
1. Super high-temperature resistant, suitable for extreme graphiteification conditions
It can work stably at temperatures ranging from 2800 to 3000℃ for a long time, far exceeding the temperature limits of ceramic and metal containers. It fully meets the process requirements for high-temperature graphiteification of artificial graphite anodes, without the risks of softening or melting.
2. High purity, low impurities, eliminating negative electrode contamination
The ash content of the main body is ≤ 20 ppm, and the content of heavy metals (Fe, Cu, Al, Ni) is extremely low. It does not release volatile impurities at high temperatures. It can effectively prevent the occurrence of side reactions, battery gas production, and rapid cycle degradation in artificial graphite anodes, and is the basic guarantee for the production of high-end lithium battery anodes.
Core performance features
3. Excellent thermal shock resistance, long cycle service life
The thermal expansion coefficient is extremely low, capable of withstanding more than 50 cycles of intense temperature fluctuations from room temperature to 3000°C. It is not prone to cracking or chipping. Under standard conditions, the total number of usage times of the furnace is ≥ 100 times, which is much better than traditional ceramic crucibles and metal crucibles, significantly reducing the frequency of material replacement on the production line.
4. Excellent thermal conductivity, high consistency of material quality
The thermal conductivity can reach 120 - 150 W/m·K. The temperature difference between the inside and outside, as well as the top and bottom of the box is extremely small. The graphiteization degree, crystal structure of the entire batch of artificial graphite anode are uniform and consistent, stabilizing the electrochemical indicators such as capacity, rate, and cycle of the negative electrode products.
Industry Application and Selection Guide
Core industry application scenarios
New energy vehicle battery field
The main negative electrode material for global electric vehicles is artificial graphite. This type of graphite crucible is the core consumable material for the negative electrode production line of battery cells. It is suitable for large-scale pusher ovens / graphitization furnaces of leading battery enterprises and large-scale artificial graphite material manufacturers. It mainly features high purity and long lifespan, ensuring the high cycle and high safety requirements of battery cells. It is also a key procurement product for the supply chains of American and European new energy vehicle manufacturers.
Large-scale energy storage battery field
The markets for grid energy storage, industrial and commercial energy storage, and household energy storage have rapidly expanded. Energy storage batteries generally adopt long-cycle artificial graphite negative electrodes. The production lines mainly use continuous and automated equipment, and prefer to select modular and coated-enhanced graphite crucibles to balance production capacity, cost, and service life.
Industry Application and Selection Guide
High-end consumer electronic lithium batteries
Lithium batteries for 3C products such as mobile phones, laptops, and Bluetooth headphones. Some high-end models use modified artificial graphite anodes. For small and medium batch production lines with multiple formulations, partitioned graphite crucibles are selected to facilitate the separate production of different types of materials.
Silicon-carbon composite anode production
Silicon-carbon anode is the next-generation high-capacity anode material. It also requires a high-temperature graphiteification process of around 2800℃, with higher requirements for container purity and temperature resistance. Currently, the mainstream choice is high-purity isostatic pressing + sealed cover graphite crucibles
| Performance Index | Graphite Sagger for Synthetic Graphite Anode | Traditional Ceramic Sagger | Metal Crucible | C/C Composite Sagger |
|---|---|---|---|---|
| Max. Operating Temperature | 3000℃ | 1600℃ | 1200℃ | 2500℃ |
| Thermal Conductivity | 120–150 W/m·K | 10–20 W/m·K | 50–80 W/m·K | 80–100 W/m·K |
| Thermal Shock Resistance | Excellent (>50 cycles) | Poor (<10 cycles) | Moderate (10–20 cycles) | Good (30–50 cycles) |
| Impurity Content | Extremely low (≤20 ppm) | Medium (50–100 ppm) | High (>100 ppm) | Low (20–50 ppm) |
| Service Life | Long (≥100 cycles) | Short (<30 cycles) | Medium (30–50 cycles) | Long (≥80 cycles) |
| Cost | Medium-high | Low | Medium | High |
| Compatibility | Excellent (Dedicated for anode) | Poor (Easy contamination) | Very poor (Metallic contamination) | Good |
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