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ARTICLE

Effect of metal cations on the conductivity and interfacial stability of Li₇P₃S_10.7Br_0.3 sulfide solid-state electrolytes

J. H. Zhou^a, S. H. Cao^b,*, X. Y. Li^a, C. Y. Shen^a, M. Cong^b

a Huizhou Power Supply Bureau, Guangdong Power Grid Co., Ltd. Huizhou 516000, Guangdong, China
b Shandong Taikai High Voltage Switchgear Co., Ltd., Tai’an 271000, Shandong, China

* Corresponding Author:

Chalcogenide Letters 2023, 20(4), 301-313. https://doi.org/10.15251/CL.2023.204.301

Received 08 February 2022; Accepted 28 April 2023;

Abstract

The development of sulfide solid electrolyte is limited by the interface instability with lithium metal and low ionic conductivity. In this work, the effects of doping SiS₂, SnS, ZnS and MnS on the ionic conductivity and interfacial stability of sulfide electrolytes are systematically investigated. The conductivity of Li₇P_2.9Sn_0.1S_10.7Br_0.3 solid electrolyte was as high as 1.67 mS cm^-1 . Furthermore, it is found that the critical current density was proportional to the resistivity of the doping element. The critical current density of the electrolyte was significantly increased by electronically insulating Si doping, reaching 0.858 mA cm^-2. .

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Keywords

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