Reportedly, a Seoul National University research team got success in 100 charges and discharges of an all-solid-state battery with a silicon wafer as a negative electrode.
Normally, Lithium-ion rechargeable batteries that are used in EVs utilize liquid electrolytes and thus are susceptible to fire and explosion. While, in contrast, all-solid-state battery use incombustible solid electrolytes, and have higher energy density.
In addition to this, in a lithium-ion rechargeable battery, graphite is used for the negative electrode. While it is replaced with silicon particles in all-solid-state batteries. Also, the powder-based electrode needs interparticle air gaps. It means an increase in resistance blocks intra-electrode lithium movements. The same results in a decline in performance and service life as well. Therefore, commercial all solid-state batteries are yet to come.
The university reinstates the silicon particles with a silicon wafer. This is to accomplish a capacity of 10 mAh per square centimeter as a battery cell unit area. It is 200 percent to 300 percent as compared to commercial lithium-ion batteries. The wafer was wet engraved aims for the purpose of surface roughness adjustment, it also enables better wafer electrolyte contact. On the other hand, the continuous charge and discharge were successfully brought out at room temperature.
This research project was endorsed by the Samsung Group, the Ministry of Science and ICT, and the National Research Foundation of Korea.
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