As the "heart container" for the production of negative electrode materials, it directly determines the purity, crystallinity, conductivity and cycling performance of the negative electrode materials, and also affects the production efficiency and cost control. Currently, the mainstream negative electrode materials for applications in new energy vehicle batteries, consumer electronic batteries and energy storage batteries are prepared through this process, and they are the core consumables in the upstream of the lithium battery industry chain.
As the "heart container" for the production of negative electrode materials, it directly determines the purity, crystallinity, conductivity and cycling performance of the negative electrode materials, and also affects the production efficiency and cost control. Currently, the mainstream negative electrode materials for applications in new energy vehicle batteries, consumer electronic batteries and energy storage batteries are prepared through this process, and they are the core consumables in the upstream of the lithium battery industry chain.
Core Technological Advantages
Ultra-high temperature stability (core requirement of the industry)
Long-term working temperature: 2800–3000℃, short-term up to 3200℃, meeting the highest temperature process requirements for graphiteification of negative electrode materials
Thermal stability: Maintaining structural integrity at high temperatures, without softening, deformation, or cracking, ensuring batch stability
Isostatic pressing products: Uniform and dense microstructure, isotropic contraction at high temperatures, excellent dimensional precision retention
Ultra-high purity and low impurities (the quality lifeline of negative electrode materials)
Fixed carbon content: ≥ 99.95%, high-end products can reach 99.99%+
Ash content control: ≤ 50 ppm (ordinary grade), ≤ 20 ppm (high-end grade), ≤ 10 ppm (research grade)
Impurity control: Strictly limit metal impurities such as Fe, Ni, Cu, V, Cr, etc., to avoid contaminating the negative electrode material and causing an increase in battery self-discharge
Raw material selection: Use high-purity artificial graphite / natural flake graphite, through multi-level purification process, to ensure material purity
Excellent thermal physical properties
Thermal conductivity: 120–180 W/(m·K), rapid and uniform heat transfer, shortens the graphitization cycle and enhances production efficiency
Thermal expansion coefficient: 2.5–4.0 × 10⁻⁶/℃, extremely low thermal expansion rate, outstanding thermal shock resistance
Thermal shock resistance: ≥ 30 cycles (rapid cooling from 1000℃ to 25℃), reduces the risk of cracks caused by rapid cooling and heating
Electrical conductivity: resistivity ≤ 10 μΩ·m, can be directly used for induction heating, reduces energy consumption
Chemical stability and service life
Chemical inertness: Inert to carbon materials and high-temperature gases (Ar, N₂), no chemical reactions occur
Service life: For ordinary products, 4-6 furnace cycles; for coated products, 10-15 furnace cycles; for isostatic high-purity products, 15-20 furnace cycles
Cost performance: Low single-use cost, suitable for large-scale industrial production
Usage Notes (Improving Lifespan and Product Quality)
Preheating: Before the first use, it is necessary to preheat at 800–1000℃ for 2–4 hours to remove moisture and volatile substances, and to prevent cracking.
Loading quantity control: Do not exceed 85% of the capacity, leaving space for material expansion to avoid crucible deformation.
Atmosphere protection: Use inert gases such as argon or nitrogen for protection to prevent high-temperature oxidation and extend lifespan.
Cooling control: Use a stepwise cooling method to avoid thermal shock damage caused by rapid cooling.
Regular inspection: After each use, check the surface coating, cracks, and deformation conditions, and replace damaged products in time.
| Performance Index | Unit | High Power (HP) Graphite Electrode | Regular Power Graphite Electrode | Advantages in Application |
|---|---|---|---|---|
| Flexural Strength | MPa | ≥10.5 | ≥8.5 | Good resistance to bending and vibration, less prone to breakage |
| Compressive Strength | MPa | ≥45 | ≥35 | Stronger load-bearing capacity, anti-collision during hoisting and handling |
| Thermal Shock Resistance | / | Resist thermal cycling above 200℃ | Resist thermal cycling above 150℃ | No cracking or spalling under rapid temperature change inside furnace |
| Thermal Conductivity | W/(m·K) | 120~150 | 80~100 | Faster heat dissipation and higher melting efficiency |
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