1. Product Core
High-Carbon Flake Graphite is a high-end graphite product made from natural flake graphite as the initial raw material, processed through physical purification (such as flotation, acid washing) or chemical purification processes.Its core feature is a fixed carbon content of ≥ 94% and the complete preservation of the layered flake structure of natural graphite. Its core value lies in the combination of high purity and excellent physical and chemical properties. It is a key foundational material that connects natural graphite resources with high-end fields such as lithium batteries, high-end conductivity, and fire resistance, providing core support for downstream product performance upgrades.
2. Product Features
High purity and low impurities: The fixed carbon content is generally between 94% and 99.9%, and some high-end specifications can reach over 99.95%; The ash content is low (usually ≤ 0.1% -6%, adjusted in reverse with fixed carbon content), and harmful impurities such as silicon, aluminum, iron, and sulfur are strictly controlled at extremely low levels (such as iron content ≤ 0.02%, sulfur content ≤ 0.05%), which can avoid downstream product performance interference.
Complete scale structure: The scale morphology is regular, with a diameter usually ranging from 0.1-1.5mm and a thickness of 2-10μm. The layered crystal structure is intact; The appearance is silver gray metallic luster, with a bulk density of 1.0-1.6g/cm³. Its unique scale structure gives it excellent interlayer sliding and processability.
Excellent physical and chemical properties: Due to high crystallinity and purity, it has excellent conductivity (volume resistivity ≤ 10μΩ·m) and thermal conductivity (thermal conductivity ≥ 150W/(m·K)); Strong high temperature resistance, able to withstand temperatures above 3000℃ in an inert environment, and excellent chemical stability in acidic and alkaline environments (except for strong oxidizing acids), making it less prone to corrosion.
Good processing adaptability: The scale structure is easy to crush but not easily broken into fine powder, making it convenient for subsequent processing such as spheroidization, molding, coating, etc; We can customize the scale size and purity level according to our needs, and adapt to different downstream processes. For example, lithium negative electrodes require fine scales (0.1-0.5mm), while refractory materials require coarse scales (0.8-1.5mm).
3. Product Usage
Core raw materials for lithium-ion negative electrode materials: As the basic raw material for high-capacity lithium-ion negative electrodes, spherical graphite is made through processes such as crushing, spheroidization, and coating, and is used for power batteries (new energy vehicles), energy storage batteries (energy storage power stations), and high-end consumer batteries (laptops, drones); High purity can enhance the battery's specific capacity (≥ 360mAh/g) and cycle life (≥ 2000 cycles).
High-end conductive material fillers: Added to plastics, rubber, and coatings to make conductive composite materials, used for electronic device casings (anti-static), lithium battery ear seals (conductive sealing), and photovoltaic module conductive adhesives; High conductivity can reduce material resistance, improve conductivity uniformity, and meet the needs of high-precision electronics.
Special refractory material components: High-Carbon Flake Graphite is used for producing high-end refractory bricks (steel blast furnace lining), refractory coatings (protection of high-temperature components of aerospace equipment), and protective slag for continuous casting; High purity and high temperature resistance can enhance the slag erosion resistance of refractory products and extend their service life (30% -50% higher than ordinary graphite refractory materials).
Precision lubricants and sealing materials: Made into graphite lubricants (used for lubricating aviation engines and precision machine tool components), using interlayer sliding to reduce the friction coefficient (≤ 0.15); Or processed into flexible graphite seals (for pipeline and valve seals), with both high and low temperature resistance (-200℃~600℃) and high pressure resistance (≤ 30MPa) characteristics.
Other high-end fields: Used in nuclear industry graphite components (low impurities can reduce radiation absorption), graphene preparation precursors (high purity reduces the difficulty of graphene purification), high-end pencil leads (high gloss and writing fluency) and other fields, relying on purity and structural advantages to expand application boundaries.
4. Technical Parameters
|
Technical Indicators |
Unit |
Conventional Scope |
Instructions |
|
Fixed carbon content |
% |
94.0-99.95 |
Core grading indicators, 94% -96% for ordinary high carbon, 97% -99% for high purity, and above 99.9% for ultra-high purity; Ultra high purity is mainly used in the fields of lithium batteries and graphene |
|
Scale size |
mm |
0.1-1.5 |
Support customization, common specifications: 0.1-0.3mm (for lithium batteries), 0.3-0.8mm (for conductive materials), 0.8-1.5mm (for refractory materials) |
|
Ash content |
% |
≤0.1-6.0 |
Negative correlation with fixed carbon content, ash content ≤ 0.1% when fixed carbon is 99.9%, and ash content ≤ 6.0% when fixed carbon is 94% |
|
Moisture content |
% |
≤0.5 |
Control storage and processing stability to avoid clumping or affecting downstream forming processes |
|
Volatile content |
% |
≤1.0 |
Refers to the volatile substance content at 200℃, which may cause bubbles during processing and affect product quality if it is too high |
|
Iron content |
% |
≤0.02-0.5 |
Key harmful impurities are required to be ≤ 0.02% in the lithium battery field and ≤ 0.5% in the general industrial field |
|
Sulfur content |
% |
≤0.03-0.1 |
Affects high temperature performance, with a requirement of ≤ 0.03% in the fields of fire resistance and lithium batteries to avoid the generation of harmful gases at high temperatures |
|
Volume resistivity |
μΩ·m |
≤10 |
Measuring conductivity, the lower the value, the more suitable it is for the field of conductive materials and lithium batteries. Ultra high purity specifications are usually ≤ 5μΩ·m |
|
Bulk density |
g/cm³ |
1.0-1.6 |
Related to scale size, fine scales have a lower packing density (1.0-1.2g/cm³) and coarse scales have a higher density (1.4-1.6g/cm³) |
|
pH Value |
- |
6.0-8.0 |
Neutral or weakly alkaline, avoiding corrosion of downstream processing equipment, compatible with most electrolytes and substrate materials |
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