SUPA G® is a graphene slurry which has been developed by GMG over the last 3 years for GMG’s own Graphene Aluminium-Ion Battery which has unique properties of high electrical conductivity, low charge transfer resistance and high density compared to other carbon battery additives and materials used in lithium-ion batteries.

The Graphene comes from GMG’s self-developed graphene production system and is then processed through a number of steps in the co-located pilot plant and finally into a liquid graphene product which GMG which can be added into or coated onto either a customer’s lithium-ion battery cathode or anode with a 0.5-2% dosage by weight.

GMG is currently engaged in confidential discussions with multiple battery manufacturers and industry players to explore the potential testing and supply of SUPA G®. These discussions underscore the growing demand for high-performance materials that can push the boundaries of energy storage technology.

Exceptional Performance Confirmed by recent study

A recent study has confirmed the exceptional performance of GMG’s SUPA G®. Key findings include:

1. SUPA G® demonstrates 2.5 times lower mean ionic resistivity compared to standard graphite, as shown in Figure 1. lower pore ionic resistivity will improve battery efficiency, charge and discharge rates.

Figure 1: Ionic Resistivity of Graphite vs. GMG SUPA G® (100 µm thick, 30% porous vs. 125 µm thick)

2. SUPA G® features multimodal particle distribution (~20 µm large particles + sub-1 µm particles), which increases energy density for more powerful, longer lasting batteries.

Figure 2: Cross-Section of SUPA G® with Wide-Beam Ar+ Ion Polishing

3. Unlike conventional materials, SUPA G® maintains its integrity during calendaring (compression onto battery foil), ensuring no significant damage to the binder layer. This is crucial for maintaining battery longevity and performance.

Figure 3: Nyquist Plot of EIS Response – Calendared vs. Uncalendared SUPA G®

Table 1 shows SUPA G® in comparison with the commonly used conductivity carbon additives used in lithium-ion battery industry– it shows many attractive attributes for SUPA G® including 2-3 times higher bulk density and 3 times greater surface area than the industry standard carbon additive.

Table 1: Performance Comparison of GMG SUPA G® and Commonly used Conductivity Additive

GMG’s Graphene has been found to increase rate tolerance of lithium-ion batteries – which is a desirable quality that allows the battery to be charged and discharged at various rates (faster and slower) with less negative impact on the capacity of the battery.