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Elucidation of the role of lithium iodide as an additive for the liquid‐based synthesis of Li 7 P 2 S 8 I solid electrolyte
Author(s) -
Bintang His Muhammad,
Lee Seongsoo,
Kim Jun Tae,
Jung HunGi,
Chung Kyung Yoon,
Whang Dongmok,
Lim HeeDae
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5775
Subject(s) - dissolution , chemistry , iodide , lithium (medication) , lithium iodide , electrolyte , sulfide , nucleophile , inorganic chemistry , fast ion conductor , phase (matter) , chemical engineering , organic chemistry , catalysis , medicine , electrode , engineering , endocrinology
Summary Liquid‐phase synthesis for a sulfide‐based solid electrolyte has been widely studied due to its great advantage of being a simpler and more cost‐effective method compared with the conventional solid‐phase synthesis, even it could induce homogeneous reactions in the solution. However, the physically and chemically stable phosphorus pentasulfide (P 2 S 5 ) is barely soluble in various solvents; this has been a major problem for achieving a pure solution‐phase dissolving solid electrolyte. Therefore, exploring an effective additive for liquid‐phase synthesis would be worthwhile and could potentially lead to the discovery of new chemicals to produce qualified solid electrolytes. In this paper, lithium iodide's (LiI) dual role as a strong nucleophile as well as a major reactant source for producing Li 7 P 2 S 8 I is first investigated. The nucleophilic additive of LiI has been proven to break the P‐S bonds of P 2 S 5 , driving the insoluble P 2 S 5 to become the soluble intermediate complex. Also, it is demonstrated that controlling the reaction times between the LiI and the P 2 S 5 is key to achieving solution‐based synthesis, and the role of LiI is investigated by conducting bonding analysis.