Perfect reversibility of the lithium insertion in FeS2: The combined effects of all-solid-state and thin film cell configurations |
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| Institution: | 1. CNRS, Univ. Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France;2. Univ. Grenoble Alpes, F-38000 Grenoble, France;3. CEA, LETI, Minatec Campus, 17 rue des Martyrs, F-38054 Grenoble cedex, France;4. Univ. Bordeaux, CNRS, ISM, UMR 5255, Talence F-33405, France;1. CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, PR China;2. School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai 201210, PR China |
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| Abstract: | All-solid-state thin film batteries based on sputtered pyrite electrodes, a lithium phosphorus oxynitride electrolyte and a lithium anode were prepared and characterized. The successive reduction of both S22 − and Fe2 + species led to an impressive volumetric discharge capacity, five times higher than the one for LiCoO2. Excellent reversibility and capacity retention were obtained during the first and the subsequent 800 charge–discharge cycles. A continuous cycling in the low voltage domain was found to be detrimental to the reversibility of the conversion reaction, suggesting a progressive evolution of the phase distribution inside the electrode. The initial capacity was easily recovered after few full oxidation cycles. |
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