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Mason Graphite reports that experiments using Mason Graphite's Lac Guéret spherical purified graphite (SPG) and silicon (Si) additives produced very favorable results. The work plan was initially stated in the company's press release (June 7, 2021).
Sicona Battery Technologies is one of Mason Graphite’s strategic partners. The company uses its patent-pending method to integrate carbon, Si nanoparticles, SPG and/or synthetic graphite to create an economical, high-performance advanced lithium Anode material for ion battery.
Si increases the energy density of lithium-ion batteries, allowing more electricity to be stored per anode volume; for example, this will translate into a longer cruising range for electric vehicles, while using similar-sized batteries.
Compared with graphite, Si has an excellent ability to store lithium ions and energy, but it inevitably expands during charging, which leads to major mechanical challenges.
Solutions currently seen in the industry include adding a small amount of Si (usually in the form of silicon oxide "SiOx") to the graphite-based anode material when manufacturing electrode pastes to increase energy density while limiting expansion to a controllable level. However, this method is limited by the high cost of SiOx materials and the actual increase in energy density, rate capability, and long-term cycling.
The goal of the first commercial project was determined by Sicona and many possible customers around the world. Its goal is a composite anode material with a main capacity of 450 milliampere-hours ("mAh/g") per gram of material (Sicona "SiG450TM"). Because it can be simply applied to the current battery manufacturing process, it is expected that this commercial grade will soon be accepted by the industry.
These latest series of tests are based on Sicona's exclusive formula to create an engineered silicon-graphite-carbon active anode material that contains a small amount of silicon, carbon, and a mixture of Mason Graphite's SPG and synthetic graphite. Then Sicona used the 80:10:10 (AM:BM:CM) formula to verify the composite anode material in a prototype lithium-ion battery (semi-button cell).
Cyclic tests, such as rate change tests, are still continuing on the same battery, and optimization tests will be carried out soon. Tests to achieve larger capacities (such as 550 mAh/g and 650 mAh/g) and complete soft-pack battery tests are also planned for the near future.
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