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Wet‐Chemical Tuning of Li 3− x PS 4 (0≤ x ≤0.3) Enabled by Dual Solvents for All‐Solid‐State Lithium‐Ion Batteries
Author(s) -
Oh Dae Yang,
Ha A. Reum,
Lee Ji Eun,
Jung Sung Hoo,
Jeong Goojin,
Cho Woosuk,
Kim Kyung Su,
Jung Yoon Seok
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201901850
Subject(s) - lithium (medication) , solvent , tetrahydrofuran , x ray photoelectron spectroscopy , raman spectroscopy , electrolyte , miscibility , chemistry , materials science , sulfide , chemical engineering , organic chemistry , medicine , physics , optics , electrode , engineering , endocrinology , polymer
All‐solid‐state lithium‐ion batteries (ASLBs) employing sulfide solid electrolytes are attractive next‐generation rechargeable batteries that could offer improved safety and energy density. Recently, wet syntheses or processes for sulfide solid electrolyte materials have opened opportunities to explore new materials and practical fabrication methods for ASLBs. A new wet‐chemical route for the synthesis of Li‐deficient Li 3− x PS 4 (0≤ x ≤0.3) has been developed, which is enabled by dual solvents. Owing to its miscibility with tetrahydrofuran and ability to dissolve elemental sulfur, o ‐xylene as a cosolvent facilitates the wet‐chemical synthesis of Li 3− x PS 4 . Li 3− x PS 4 (0≤ x ≤0.15) derived by using dual solvents shows Li + conductivity of approximately 0.2 mS cm −1 at 30 °C, in contrast to 0.034 mS cm −1 for a sample obtained by using a conventional single solvent (tetrahydrofuran, x =0.15). The evolution of the structure for Li 3− x PS 4 is also investigated by complementary analysis using X‐ray diffraction, Raman, and X‐ray photoelectron spectroscopy measurements. LiCoO 2 /Li–In ASLBs employing Li 2.85 PS 4 obtained by using dual solvents exhibit a reversible capacity of 130 mA h g −1 with good cycle retention at 30 °C, outperforming cells with Li 2.85 PS 4 obtained by using a conventional single solvent.