Publication date: 10th April 2024
The all-solid-state battery (ASSB) is composed of a solid electrolyte, cathode and anode, unlike LIBs (lithium ion batteries) containing a combustible liquid electrolyte, and has recently been in the spotlight for its advantages of high energy density as well as high safety.1 A sulfide-based all-solid-state battery with a high ion conductivity (10-3 to 10-2 S cm-1) of solid electrolytes is attracting particular attention as a high-capacity and high-power battery.2 The sulfide-based solid electrolyte, the core material of this battery, has the advantage of being stable against heat, so when designing battery modules and packages, it is expected to increase the energy density at the package level by simplifying the cooling parts.
The sulfide-based solid electrolyte has high reactivity with atmospheric moisture and generates hydrogen sulfide (H2S), which leads to an increase in process cost and safety issues when mass-producing the battery. In order to overcome this, it is necessary to improve the moisture stability of the solid electrolyte. Through many studies, it has been confirmed that moisture stability is able to be improved through substitution or doping of oxides3, however the conductivity is largely reduced, and further improvement is required. In this study, as a way to improve the problems, we combined Argyrodite solid electrolyte and ion conductive oxide (Li3PO4) to minimize the decrease in ionic conductivity and improve atmospheric stability. In addition, the electrochemical stability of the material was investigated by evaluating the electrochemical properties to which the high-capacity cathode material (NCM811) was applied as pouch-type all solid state battery cell.
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