Benefits and properties
- Highly pure graphite powder (ash content ≤ 0.3 %)
- Reduces formation of lead sulfate layers on negative plate surface
- Avoids drop of battery capacity
- Enhances cycle life especially under high-rate partial-state-of-charge (HRPSoC) conditions, which are relevant to hybrid and electric vehicles
- Improves dynamic charge acceptance (DCA)
Manufacturing of expanded graphite additives
For the production of SIGRACELL GFG expanded graphite powder SGL Carbon uses only high-quality and high-purity natural graphite flakes as raw material. The flakes are mixed with a highly oxidizing acid forming an intercalation compound which is expanded via thermal decomposition. The resulting loose worms of pure graphite are compressed into foil without the use of any binders or fillers. In the last step, the foil is ground into SIGRACELL GFG powder.
SGL Carbon looks back to nearly 50 years of experience in flexible graphite production. Our SIGRACELL GFG expanded natural graphite powder production sites are located in Valencia, CA, USA and in Meitingen, Germany. We own the full value chain, from raw material procurement and monitoring to graphite foil production, foil milling and product analysis and testing. This allows us to control and assure the high quality of SIGRACELL GFG powder and to tailor the particle size. In addition, we offer an extensive research and development network with various measurement capability in-house.
Currently, we offer highly pure SIGRACELL GFG flexible graphite powder with a D50 value of both 5 µm (GFG5 HP) and 20 µm (GFG20 HP). We will be pleased to advise you in choosing the best powder for your specific application. Just ask us!
Application specific suitability
SIGRACELL GFG battery powder is an optimum performance and conductivity additive for advanced lead acid batteries, zinc-ion and lithium-ion batteries.
Are you interested in testing our materials? Contact us!