High Purity Spherical Graphite For High Performance Lithium Ion Batteries

High-Purity Spherical Graphite For High-Performance Lithium-Ion Batteries

Spherical graphite is a specialized form of graphite that is manufactured through a process called spheronization. It has unique properties that make it highly suitable for use in lithium-ion batteries, particularly in the anode material. Here are some common specifications and properties of spherical graphite:

1. Particle Size and Distribution: Spherical graphite is typically produced in a narrow range of particle sizes, often with a median particle size around 15-30 micrometers. The uniform particle size distribution is crucial for ensuring consistent performance and electrode packing density in battery applications.

2. Tap Density: Spherical graphite has a relatively high tap density, typically ranging from 0.8 to 1.2 grams per cubic centimeter (g/cm³). High tap density is desirable as it allows for increased energy density and improved volumetric efficiency in lithium-ion batteries.

3. Graphite Purity: Spherical graphite is generally characterized by high purity, with carbon content exceeding 99.95%. Low impurity levels are essential to avoid detrimental effects on battery performance and stability.

4. Particle Shape: As the name suggests, spherical graphite exhibits a spherical or near-spherical particle shape. This unique morphology provides advantages in terms of electrode packing density, electrical conductivity, and lithium ion diffusion kinetics.

5. Surface Area: Spherical graphite typically has a relatively low specific surface area, which is advantageous for battery applications. A lower surface area reduces the contact area with the electrolyte, minimizing side reactions and improving overall battery stability.

6. Expansion Capability: Spherical graphite exhibits limited expansion upon lithium intercalation, which is essential for stable battery performance. The controlled expansion helps to mitigate mechanical stress and maintain electrode integrity during charge-discharge cycles.

7. Thermal Conductivity: Spherical graphite possesses good thermal conductivity, allowing for efficient heat dissipation during battery operation. This property helps in managing temperature rise and enhancing battery safety.

8. Electrical Conductivity: Spherical graphite demonstrates excellent electrical conductivity due to its high carbon content and unique particle shape. This property facilitates rapid electron transport within the battery electrode, contributing to improved battery performance.

9. Chemical Stability: Spherical graphite is chemically stable and resistant to most electrolytes used in lithium-ion batteries. This stability ensures long-term cycling stability and prevents degradation of the electrode material.

It's important to note that the specifications and properties of spherical graphite can vary depending on the specific manufacturing process, source of graphite, and intended application. Therefore, it is advisable to consult product datasheets or reach out to manufacturers for precise information regarding a particular grade or product.