Spherical Graphite Micropowder

1. Product Core

Spherical Graphite Micropowder is made of high-purity natural flake graphite as the substrate, processed through four core precision processes of "coarse crushing and purification → airflow pulverization and spheroidization → high-temperature graphitization → plasma surface modification", and finally formed into micrometer sized spherical powder. Its core advantage lies in the dual empowerment of "intrinsic properties of graphite + spherical structural characteristics": it retains the low resistance, high thermal conductivity, acid and alkali resistance characteristics of graphite, and improves the powder flowability (resting angle ≤ 30 °) and tap density through spheroidization, solving the pain points of easy agglomeration and difficult molding of ordinary graphite powder. It is an indispensable functional basic material in the fields of new energy lithium batteries, high-end electronics, and precision manufacturing, especially in the negative electrode of lithium-ion batteries, which can directly improve the battery energy density (up to 300Wh/kg or more) and cycle stability.

2. Product Features

Ultra high sphericity: The particles are standard spherical or quasi spherical in shape, with a sphericity of ≥ 92% (industry standard ≥ 88%). The roundness deviation of the particles observed by scanning electron microscopy (SEM) is ≤ 5%, which can reduce the frictional resistance between particles, reduce the wear of forming equipment, and improve the uniformity of material mixing, with a material loss rate of ≤ 1%.

Scenario based particle size distribution: The particle size can be customized according to the application scenario. The commonly used D50 in the consumer lithium battery field is 3-8μm, the commonly used D50 in the power lithium battery field is 8-12μm, and the commonly used D50 in the energy storage lithium battery field is 12-18μm. All specifications have a D10/D90 span of ≤ 10μm to avoid electrode thickness deviation caused by uneven particle size.

Efficient conductivity and thermal conductivity: After high-temperature graphitization treatment (temperature ≥ 2800 ℃), the fixed carbon content is ≥ 99.95% (ordinary graphite ≥ 99.5%), the volume resistivity is ≤ 8μΩ·m, and the thermal conductivity is ≥ 160W/(m·K). Compared with ordinary spherical graphite, the conductivity efficiency is increased by 15%-20%, which can reduce the heat accumulation during battery charging and discharging process.

Ultra low impurity control: Adopting the "hydrochloric acid - hydrofluoric acid mixed pickling + high-temperature impurity removal" process, the ash content is ≤ 0.08%, and the key harmful impurities (Fe ≤ 30ppm, Si ≤ 25ppm, S ≤ 15ppm) are far below the industry standard (each ≤ 50ppm), avoiding impurity ions from embedding in the positive electrode of the battery and causing capacity degradation.

Strong environmental adaptability: Excellent stability in pH 2-12 acidic and alkaline environments (except for concentrated nitric acid and sulfuric acid), temperature resistance range extended to -250 ℃ to 3200 ℃ under inert atmosphere, moisture increment ≤ 0.1% after 30 days in humid environment (relative humidity ≤ 85%), and no moisture absorption or agglomeration phenomenon.

High molding compatibility: The tap density is ≥ 1.3g/cm³ (ordinary spherical graphite ≥ 1.1g/cm³), and it has good compatibility with mainstream binders such as PVDF (polyvinylidene fluoride) and CMC (carboxymethyl cellulose). The compacted density of the electrode sheet made can reach 1.6-1.8g/cm³, meeting the needs of high-capacity battery electrode molding.

 

 

3. Product Usage 

Negative electrode material for lithium-ion batteries:

Power lithium batteries: Compatible with ternary lithium batteries (NCM) and lithium iron phosphate batteries (LFP), used for new energy vehicles (such as power battery packs) and electric heavy-duty trucks. The battery can maintain a capacity retention rate of ≥ 80% after 1500 cycles, and the power can reach 80% in 30 minutes of fast charging.

Consumer lithium batteries: Used for smartphones and laptops to increase battery volume energy density (≥ 700Wh/L) and extend single use battery life.

Energy storage lithium batteries: Used in household energy storage power stations and base station energy storage systems, with a discharge capacity retention rate of ≥ 75% in low temperature environments of -20 ℃.

High end conductive paste: Prepare electronic paste by compounding with silver powder and copper powder, which is used for the conductive layer of flexible circuit boards (FPC) and the conductive coating of 5G base station antennas. The viscosity of the paste can be stabilized at 5000-8000cP, and the printing pass rate is ≥ 98%.

Precision lubricating material: As a solid lubricant added to aviation engine lubricating oil and high-temperature mold lubricating grease, the friction coefficient is as low as 0.12, and it can still maintain lubrication performance under high temperature conditions of 300 ℃, extending the service life of components by 2-3 times.

Functional composite materials:

Thermal conductive composite material: Mixed into aluminum alloy for LED heat sink, increasing the thermal conductivity of aluminum alloy by 30%, solving the problem of high temperature attenuation of LED beads.

Anti static material: Composite with PP (polypropylene) to make electronic component packaging film, with a stable surface resistance of 10⁶-10⁸Ω, meeting ESD protection requirements.

Special field applications: After modification with silane coupling agents, it can be used as a coating for fuel cell bipolar plates to enhance their corrosion resistance; It can also be used as an auxiliary conductive agent for silver paste in photovoltaic cells, reducing the amount of silver paste (by 10%-15%) and lowering the cost of photovoltaic modules.

4. Technical Parameters (including Customization Scope)

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