High-Conductivity Argyrodite Li6PS5Cl Solid Electrolytes Prepared via Optimized Sintering Processes for All-Solid-State Lithium-Sulfur Batteries

Shuo Wang; Yibo Zhang; Xue Zhang; Ting Liu; Yuan-Hua Lin; Yang Shen; Liangliang Li; Ce-Wen Nan

doi:10.1021/acsami.8b15121

High-Conductivity Argyrodite Li₆PS₅Cl Solid Electrolytes Prepared via Optimized Sintering Processes for All-Solid-State Lithium-Sulfur Batteries

ACS Appl Mater Interfaces. 2018 Dec 12;10(49):42279-42285. doi: 10.1021/acsami.8b15121. Epub 2018 Nov 29.

Authors

Shuo Wang¹, Yibo Zhang¹, Xue Zhang¹, Ting Liu¹, Yuan-Hua Lin¹, Yang Shen¹, Liangliang Li¹, Ce-Wen Nan¹

Affiliation

¹ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China.

PMID: 30451491
DOI: 10.1021/acsami.8b15121

Abstract

Highly Li-ion conductive Li₆PS₅Cl solid-state electrolytes (SSEs) were prepared by solid-state sintering method. The influence of sintering temperature and duration on the phase, ionic conductivity, and activation energy of Li₆PS₅Cl was systematically investigated. The Li₆PS₅Cl electrolyte with a high ionic conductivity of 3.15 × 10^-3 S cm^-1 at room temperature (RT) was obtained by sintering at 550 °C for just 10 min, which was more efficient taking into account such a short preparation time in comparison with other reported methods to synthesize Li₆PS₅Cl SSEs. All-solid-state lithium sulfur batteries (ASSLSBs) based on the Li₆PS₅Cl SSE were assembled by using the nano-sulfur/multiwall carbon nanotube composite combined with Li₆PS₅Cl as the cathode and Li-In alloy as the anode. The cell delivered a high discharge capacity of 1850 mAh g^-1 at RT for the first full cycle at 0.176 mA cm^-2 (∼0.1C). The discharge capacity was 1393 mAh g^-1 after 50 cycles. In addition, the Coulombic efficiency remained nearly 100% during galvanostatic cycling. The experimental data showed that Li₆PS₅Cl was a good candidate for the SSE used in ASSLSBs.

Keywords: all-solid-state battery; argyrodite Li6PS5Cl; lithium−sulfur battery; solid-state sintering; sulfur solid electrolyte.