1.Core Product Positioning
Battery grade expandable graphite is made from high-purity natural flake graphite (purity ≥99.8%) as the base material via a big data-optimized low-temperature intercalation process, and its core function is to provide dual protection (flame retardancy + thermal conductivity) for lithium-ion batteries. It addresses the pain points of thermal runaway and local overheating in lithium-ion batteries, and ranks among the Top 5 fastest-growing products in the 2025 lithium-ion battery safety material market (18.5% annual growth rate, Data Source: Global Lithium-Ion Battery Materials White Paper).
2. Technical Parameters
|
Technical Indicators |
Mainstream Specification Values |
|
180-220℃ |
|
|
Expansion Ratio |
180-250 mL/g |
|
Ash Content |
≤0.5% |
|
Moisture Content |
≤0.3% |
|
Particle Size Distribution |
200-400 Mesh |
|
Electrical Conductivity |
≥150 S/m |
3.Core Features
Precise Thermal Response: For battery grade expandable graphite, according to over 800 thermal runaway simulation tests for lithium-ion batteries, when heated to 180-220℃ (matching the critical temperature of lithium-ion battery thermal runaway), it expands 180-250 times within 5-8 seconds to form a dense heat-insulating carbon layer.The thermal runaway protection rate is increased to 92%, far exceeding that of traditional flame retardants (65%);
Synergistic Thermal Conductivity and Flame Retardancy: With a transverse thermal conductivity of ≥280 W/(m·K), it can quickly dissipate local heat from battery cells (reducing hot spot temperature by 15-20℃). Meanwhile, its flame retardant performance reaches UL94 V0 class, complying with the IEC 62133 lithium-ion battery safety standard;
High Compatibility: Through adaptation tests with over 300 types of lithium-ion battery materials (cathodes, separators, electrolytes), its dispersibility score is ≥9.3 (on a 10-point scale). It has no agglomeration and does not react chemically with electrolytes, with a battery cell capacity retention rate of ≥95% (after 500 cycles);
Long-Term Stability: After 10,000 hours of damp-heat aging tests (45℃/90% humidity), the attenuation of expansion ratio is ≤3%, meeting the 5-8 year service life requirement of lithium-ion batteries (big data shows that downstream demand for this feature accounts for 76%).
4. Core Applications
Power Battery Cells (45% proportion, the largest application scenario): Added to separator coatings or cathode materials to improve the thermal safety of ternary lithium/lithium iron phosphate battery cells. According to automotive enterprise data, it can reduce the thermal runaway failure rate of power batteries by 88%;
Energy Storage Lithium-Ion Battery Packs (30% proportion): Used in Pack flame-retardant buffer layers, suitable for 100-1000 kWh energy storage batteries, extending the battery cycle life to over 12,000 times (an increase of 25%);
Consumer Electronics Lithium-Ion Batteries (18% proportion): Used in thermal conductive gaskets for battery cells of mobile phones and laptops to solve local overheating during fast charging, reducing the maximum cell temperature by 18℃;
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