Structural Origins of the Enhancement in Ionic Conductivity of a Chalcogenide Compound by Adding AgI

Wanchun Qiao, Ang Qiao, Yunhang Tao, Shaoxun Gu, Yuanzheng Yue, Haizheng Tao*


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Through a chemo-mechanical milling process, we prepared a highly conductive (1.1×10−3 S ⋅ cm−1) amorphous 0.5AgI ⋅ 0.5 Ag3PS4 conductor, which is much higher than that of pure amorphous Ag3PS4 (8.5×10−4 S ⋅ cm−1). Detailed structural characterizations indicate that compared to the ionic conductivity of the amorphous Ag3PS4 conductor, the enhancement can be ascribed to the formation of mixed polymeric anions {[PS4]mIn} around Ag+ ions. Through heat-treatment at 370 °C for 20 minutes, the room temperature ionic conductivity of the 0.5AgI ⋅ 0.5 Ag3PS4 conductor is further enhanced by about 4 times. This enhancement can be ascribed to the following two aspects: 1) the existence of residual amorphous phase with higher ionic conductivity; 2) the connection of the fast ionic conductive interfaces between the deposited Ag7PS6 nano-crystals and the residual amorphous phase. This work reveals the key roles of both disorder and interface in improving the ionic conductivity of solid-state electrolytes.

Udgave nummer7
Sider (fra-til)1567 –1572
Antal sider6
StatusUdgivet - 10 feb. 2020