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Issue 4, 2014
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Preparation conditions of NiS active material in high-boiling solvents for all-solid-state lithium secondary batteries

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Abstract

Nickel sulfide particles were synthesized by thermal decomposition of nickel acetylacetonate in a mixed solution of 1-dodecanethiol and high-boiling solvents. Nickel sulfide was formed by thermal decomposition of nickel(II) dodecanethiolate in the high-boiling solvent, and the crystal phases of nickel sulfide were controlled by selection of the solvent. NiS was obtained in 1-octadecene as a noncoordinating solvent. On the other hand, Ni9S8 was prepared in oleylamine as a coordinating solvent because oleylamine molecules have a strong capping ability for nickel ions in nickel(II) dodecanethiolate, and thus the oleylamine molecules prevent the diffusion of sulfur derived from nickel(II) dodecanethiolate and free 1-dodecanethiol. All-solid-state cells were fabricated by using composite electrodes prepared by wet milling in hexane. At a current density of 1.3 mA cm−2, the cell using a composite electrode prepared by wet milling exhibited a discharge capacity of 500 mA h g−1 for 30 cycles and a better cycle performance than the cell using a composite electrode prepared by hand-grinding in a mortar.

Graphical abstract: Preparation conditions of NiS active material in high-boiling solvents for all-solid-state lithium secondary batteries

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Publication details

The article was received on 17 Nov 2013, accepted on 10 Feb 2014 and first published on 11 Feb 2014


Article type: Paper
DOI: 10.1039/C3NJ01432K
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Citation: New J. Chem., 2014,38, 1731-1737

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    Preparation conditions of NiS active material in high-boiling solvents for all-solid-state lithium secondary batteries

    K. Aso, A. Hayashi and M. Tatsumisago, New J. Chem., 2014, 38, 1731
    DOI: 10.1039/C3NJ01432K

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