Synthesis, structure and electrochemical performance of the argyrodite Li6PS5Cl solid electrolyte for Li-ion solid state batteries. (10th October 2016)

• Record Type: Journal Article
• Authors: Yu, Chuang; van Eijck, Lambert; Ganapathy, Swapna; Wagemaker, Marnix
• Is Part Of: Electrochimica acta. Volume 215(2016)
• Page Start: 93
• Page End: 99
• Publication Date: 2016-10-10
• Subjects: Li-ion batteries -- solid state batteries -- Argyrodite Li6PS5Cl -- solid electrolytes -- Li-ion conduction; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.08.081
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The high lithium conductivity of argyrodite Li6 PS5 Cl makes it an attractive candidate as solid electrolyte in all solid-state Li batteries. Aiming at an optimal preparation strategy the structure and conductivity upon different mechanical milling times is investigated. Li6 PS5 Cl material with high ionic conductivity of 1.1·10 −3 S/cm was obtained by milling for 8 hours at 550 rpm followed by a heat-treatment at 550 °C. All solid-state Li-S batteries were assembled, combining the Li6 PS5 Cl solid electrolyte, with a carbon-sulfur mixture as positive electrode and Li, Li-Al and Li-In as negative electrode. An optimum charge/discharge voltage window between 0.4 and 3.0 V vs. Li-In was obtained by CV experiments and galvanostatic cycling displays a very large capacity around 1400 mAh/g during the first cycles, decreasing below 400 mAh/g after 20 cycles. Impedance spectroscopy suggests that the origin of the capacity fading is related to an increasing electrode-electrolyte interface resistance.