Cl- and Al-Doped Argyrodite Solid Electrolyte Li6PS5Cl for All-Solid-State Lithium Batteries with Improved Ionic Conductivity

Yeong Jun Choi; Sun-I Kim; Mingyu Son; Jung Woo Lee; Duck Hyun Lee

doi:10.3390/nano12244355

Cl- and Al-Doped Argyrodite Solid Electrolyte Li₆PS₅Cl for All-Solid-State Lithium Batteries with Improved Ionic Conductivity

Nanomaterials (Basel). 2022 Dec 7;12(24):4355. doi: 10.3390/nano12244355.

Authors

Yeong Jun Choi^{1

2}, Sun-I Kim¹, Mingyu Son^{1

2}, Jung Woo Lee², Duck Hyun Lee^{1

3}

Affiliations

¹ Green Materials and Processes R&D Group, Korea Institute of Industrial Technology, Ulsan 44413, Republic of Korea.
² Department of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea.
³ School of Materials Science and Engineering, Andong National University, Andong 36729, Republic of Korea.

Abstract

Argyrodite solid electrolytes such as lithium phosphorus sulfur chloride (Li₆PS₅Cl) have recently attracted great attention due to their excellent lithium-ion transport properties, which are applicable to all-solid-state lithium batteries. In this study, we report the improved ionic conductivity of an argyrodite solid electrolyte, Li₆PS₅Cl, in all-solid-state lithium batteries via the co-doping of chlorine (Cl) and aluminum (Al) elements. Electrochemical analysis was conducted on the doped argyrodite structure of Li₆PS₅Cl, which revealed that the substitution of cations and anions greatly improved the ionic conductivity of solid electrolytes. The ionic conductivity of the Cl- and Al-doped Li₆PS₅Cl (Li_5.4Al_0.1PS_4.7Cl_1.3) electrolyte was 7.29 × 10^-3 S cm^-1 at room temperature, which is 4.7 times higher than that of Li₆PS₅Cl. The Arrhenius plot of the Li_5.4Al_0.1PS_4.7Cl_1.3 electrolyte further elucidated its low activation energy at 0.09 eV.

Keywords: all-solid-state battery; argyrodite; doping; ionic conductivity; solid electrolyte.

Abstract

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