{australien_flagge}FYI Resources (ASX: FYI; FRA: SDL) and EcoGraf (ASX: EGR; FSE: FMK) have made further progress in developing a super-premium anode material for extra-high-performance lithium-ion batteries and in coating battery separators with high-purity aluminum oxide (HPA).
{australien_flagge}FYI Resources (ASX: FYI; FRA: SDL) and EcoGraf (ASX: EGR; FSE: FMK) have made further progress in developing a super-premium anode material for extra-high-performance lithium-ion batteries and in coating battery separators with high-purity aluminum oxide (HPA).
Tests by an independent U.S. laboratory found that the cycle losses during charging and discharging of improved HPA-coated anodes can be reduced to almost the theoretical minimum. Similarly, HPA coating of industry-standard polyolefin separators further reduced the irreversible capacity loss common to standard batteries. Polyolefin separators, which are made of polyethylene and polypropylene, have become widely used as separators in commercial lithium-ion batteries. Polyolefin separators play an important role by preventing physical contact between the anode and cathode while facilitating lithium ion transport in the cell.
The HPA-doped carbon coating tests were conducted at a leading U.S. commercial battery materials research facility using EcoGraf’s graphite and FYI’s innovative ultra-fine 4N HPA. Observations from the tests confirm that the HPA acts as a hydrophobic reducing agent that promotes lithium ion chemistry at the carbon anode. The absorption property of HPA ensures that the surface of the graphite particles is hydrophilic at all times, allowing all of the carbon anode material to participate in the electrochemical process. Recent testing confirms that additional concentrations of FYI HPA dopant will lead to further improvements. However, the final optimal loading has yet to be determined.
Given the positive result, the next test is to combine the FYI HPA-enhanced separator with FYI HPA-doped EcoGraf’s coated anode with a reversible capacity of 362.7 mAh/g. If a similar enhancement to the industry standard material of 7.94 mAh/g is achieved, then the reversible capacity would eventually be close to the theoretical reversible capacity of 372 mAh/g.
Figure 1: Lithium-ion battery with improved HPA-doped coated anode and HPA particles on the polyolefin separator.
FYI and EcoGraf see significant market opportunities for HPA coated anodes in the U.S. and Europe. Leading industry research group BMI Research projects demand to grow 30% per year, with selling prices for coated anodes ranging from $5,000 to $10,000 per ton.
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