Journal
ELECTROCHIMICA ACTA
Volume 215, Issue -, Pages 93-99Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.08.081
Keywords
Li-ion batteries; solid state batteries; Argyrodite Li6PS5Cl; solid electrolytes; Li-ion conduction
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Funding
- European Research Council under the European Union [307161]
- European Research Council (ERC) [307161] Funding Source: European Research Council (ERC)
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The high lithium conductivity of argyrodite Li6PS5Cl 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. Li6PS5Cl 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 degrees C. All solid-state Li-S batteries were assembled, combining the Li6PS5Cl 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. (C) 2016 Elsevier Ltd. All rights reserved.
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