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We make lithium ion secondary battery materials with silicon composite material or silicon multi-layer structure as a high-tech material that can increase capacity by up to 50% at the same weight and the same volume.
We lead the high-capacity and low-cost silicon anode materials by developing new technologies.
The newly developed spheronized micropowder is a product that complements the shortcomings of plate-shaped nanopowder and is a secondary particle made by agglomerating plate-shaped nanopowder into a sphere.
It is a silicon anode material for lithium secondary batteries that has a low specific surface area and an internal expansion space, so it has an excellent lifespan and has the same size as graphite, so it has a high rate of replacement for graphite.
Reasons for development and advantages
1. It is easy to replace graphite as it has a similar size to graphite.
2. A cathode capable of storing lithium of more than 570 mAh/g can be manufactured by replacing up to 15% of graphite.
3. There is no need to change the binder and conductive material used in graphite.
4. It can be mixed with other companies’ spherical silicon anode materials. Like the mixing performance of artificial graphite and natural graphite, each particle has only individual performance.
Our development process showed excellent cycle life up to 15% graphite replacement.
The most stable lifetime performance was between 5 and 10%. Just 10% replacement represents a high capacity of over 500 mAh/g.
When combined with graphite and using a carbon nanotube binder, the graphite replacement rate and lifespan performance can be improved.
Half-cell test result
Spheroidized micro powder is made with an average diameter of 20um and has a similar size to spheroidized natural graphite, and has a resistance of less than 0.01 Ω·cm at 1,000 kg/cm^2 through the carbon coating process of each particle. This material enables high charge and discharge speeds, enabling rapid charge and discharge up to 5C.
Below on the left are the PSA measurement result of spheroidized silicon, and on the right are the powder resistance measurement result.
