What is Graphene Powder?

Overview: Graphene powder includes both graphene powder and graphene films. The common methods for producing graphite powder are mechanical exfoliation, the reduction-oxidation method, and SiC epitaxial growth. The production method for graphene films is chemical vapor deposition (CVD). Mechanical exfoliation involves using friction and relative motion between an object and graphene to obtain thin layers of graphene. This method is simple and typically maintains the complete crystal structure of graphene.

In 2004, two British scientists used transparent tape to peel off layers of natural graphite to obtain graphene powder, which is categorized as a mechanical exfoliation method. Initially, this method was considered inefficient for large-scale industrial production. Graphene paste is a mixture; for instance, to make a lithium anode, conductive agents, binders, and other substances are added and mixed with the slurry, then applied to a copper foil surface. Graphene powder should be pure graphene, typically prepared using the Hummer method or its improved version.

Graphene powder is called a “miracle material.” Scientists even predict that graphene powder batteries will “change the 21st century.” Adding graphene to battery electrode materials can enhance charging efficiency and increase battery capacity. Self-assembled multilayer graphene sheets are ideal for lithium-air batteries and can be used in many other potential energy storage fields such as capacitors and electromagnetic guns. Moreover, new graphene materials do not rely on precious metals like platinum, which effectively reduces costs and environmental impact.

Detailed Introduction:

• Sheet Area: 100 to 400 times the diameter of similar product sheets (100μm), 10 to 20 times the diameter of similar product sheets (5 to 10μm).
• Uniform Chip Size: Significant difference compared to similar products, with over 80% uniform layers, unlike similar products with 1-10+ layers. The number of layers can be controlled, with more than 80% being homogeneous layers.
• High Solubility: Solubility (greater than 20%) is more than ten times that of similar products (less than 2%).
• Simple Functional Groups: Based on Qualcomm’s unique graphene preparation technology, the product’s functional groups are simpler and easier to functionalize, meeting various functional requirements of customers. Qualcomm’s graphene products have significantly improved quality compared to other graphene powder products globally. In fact, this is a new product. Unique physical parameters like large area and uniformity make Qualcomm’s graphene products easier to use and more economical in various application fields and product technologies.

Performance and Applications of Graphene Powder:

• Conductivity: Better conductivity than activated carbon, effectively reducing internal resistance and improving cycle life. More stable conductivity compared to conductive carbon black, with smaller dosage and higher efficiency.
• Lithium-Ion Batteries: When used in lithium-ion battery conductive materials, adding 1% graphene microchips can reduce the number of carbon nanotubes by 3/2, increasing the amount of lithium iron phosphate, thereby effectively improving battery capacity, cycle life, and rate performance.
• Adsorption Capacity: Graphene has a larger specific surface area and stronger adsorption performance than traditional photocatalyst products. For example, it is less sensitive to UV conditions, while ordinary light can stimulate reactions. Adsorption capacity is usually measured by specific surface area, and graphene’s specific surface area is much larger than that of activated carbon. Unlike activated carbon, graphene has many microporous structures.