Using a silicon wafer as the negative electrode, a research team from Seoul National University has successfully completed 100 charges and discharges of a completely solid-state battery.
Lithium-ion rechargeable batteries for EVs typically use liquid electrolytes, making them more flammable and explosive. All-solid-state batteries, on the other hand, have a higher energy density and use solid electrolytes that cannot catch fire.
The negative electrode in a lithium-ion rechargeable battery is made of graphite. An all-solid-state battery replaces it with silicon atoms. Inter-particle air gaps are a necessary component of the powder-based electrode, which implies that a rise in resistance prevents lithium transport within the electrode. Both efficiency and service life are reduced as a result. Because of this, all-solid-state commercial batteries have not yet been released.
The institution managed to attain a capacity of 10 mAh per square centimetre as a battery cell unit area by swapping out the silicon particles for a silicon wafer. In comparison to commercial lithium-ion batteries, it is 200–300% more. In order to improve wafer-electrolyte interaction and surface roughness, the wafer underwent wet etching. At room temperature, the sequential charge and discharge were completed satisfactorily.
The National Research Foundation of Korea, the Ministry of Science and ICT, and the Samsung Group all provided funding for the study. Read more information at ACS Energy Letters.
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