All-solid-state batteries (ASSBs) are promising rechargeable batteries in which conventional liquid electrolytes are replaced with solid materials. These batteries could help to safely meet the growing demands of the electronics industry, as they can exhibit high energy densities, yet they should theoretically be safer and more stable than solutions based on flammable liquid electrolytes.
The energy density of most batteries, which is the amount of energy they can store in relation to their weight and volume, is known to depend on various factors, including the voltage of the electrolytes they rely on.
Although liquid electrolytes can operate up to around 4.5 V, their stability rapidly declines beyond this limit. By contrast, solid electrolytes could remain stable at higher voltages, thus allowing batteries to store more energy.
Researchers at Yonsei University, Dongguk University, KAIST and other institutes have designed and synthesized a new fluoride-based solid electrolyte that was found to remain stable at unprecedented voltages above 5 V.
The new electrolyte, introduced in a paper published in Nature Energy, combines lithium chloride (LiCl) with lithium titanium fluoride Li2TiF6.
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