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Transformation of P 2 S 5 into a Solid Electrolyte with Ionic Conductivity at the Positive Composite Electrode of All‐Solid‐State Lithium–Sulfur Batteries
Author(s) -
Nagata Hiroshi,
Chikusa Yasuo
Publication year - 2014
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201402040
Subject(s) - electrolyte , ionic conductivity , composite number , electrode , fast ion conductor , lithium (medication) , conductivity , battery (electricity) , materials science , inorganic chemistry , ionic bonding , chemistry , chemical engineering , analytical chemistry (journal) , ion , composite material , thermodynamics , chromatography , organic chemistry , medicine , power (physics) , physics , engineering , endocrinology
Battery performance of an all‐solid‐state lithium–sulfur (Li–S) cell with a P 2 S 5 ‐based positive composite electrode was investigated in the absence of solid electrolyte at the positive composite electrode. In the positive composite electrode, P 2 S 5 without ionic conductivity was transformed into a solid electrolyte with ionic conductivity by incorporating lithium ions into P 2 S 5 during the first charge–discharge cycle. Therefore, the all‐solid‐state Li–S cell with P 2 S 5 ‐based positive composite electrode behaved as a secondary battery. This positive composite electrode is very low cost because it did not use an expensive solid electrolyte. In addition to using a cost‐effective positive composite electrode with a sulfur content of 60 wt %, the all‐solid‐state Li–S cell exhibited an extremely high capacity of 1042 mAh g −1 under 6.4 mA cm −2 at 25 °C.