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High Capacity All‐Solid‐State Lithium Batteries Enabled by Pyrite‐Sulfur Composites
Author(s) -
Ulissi Ulderico,
Ito Seitaro,
Hosseini Seyed Milad,
Varzi Alberto,
Aihara Yuichi,
Passerini Stefano
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201801462
Subject(s) - materials science , sulfur , gravimetric analysis , sulfide , electrochemistry , iron sulfide , pyrite , chemical engineering , lithium (medication) , scanning electron microscope , ball mill , electrode , composite material , metallurgy , chemistry , organic chemistry , medicine , engineering , endocrinology
As the theoretical limit of intercalation material‐based lithium‐ion batteries is approached, alternative chemistries based on conversion reactions are presently considered. The conversion of sulfur is particularly appealing as it is associated with a theoretical gravimetric energy density up to 2510 Wh kg −1 . In this paper, three different carbon‐iron disulfide‐sulfur (C‐FeS 2 ‐S) composites are proposed as alternative positive electrode materials for all‐solid‐state lithium‐sulfur batteries. These are synthesized through a facile, low‐cost, single‐step ball‐milling procedure. It is found that the crystalline structure (evaluated by X‐ray diffraction) and the morphology of the composites (evaluated by scanning electron microscopy) are greatly influenced by the FeS 2 :S ratio. Li/LiI‐Li 3 PS 4 /C‐FeS 2 ‐S solid‐state cells are tested under galvanostatic conditions, while differential capacity plots are used to discuss the peculiar electrochemical features of these novel materials. These cells deliver capacities as high as 1200 mAh g (FeS2+S) −1 at the intermediate loading of 1 mg cm −2 (1.2 mAh cm −2 ), and up to 3.55 mAh cm −2 for active material loadings as high as 5 mg cm −2 at 20 °C. Such an excellent performance, rarely reported for (sulfur/metal sulfide)‐based, all solid‐state cells, makes these composites highly promising for real application where high positive electrode loadings are required.