Synthesis of NiS–carbon fiber composites in high-boiling solvent to improve electrochemical performance in all-solid-state lithium secondary batteries

• Published in: Electrochimica acta Vol. 83; pp. 448 - 453
• Main Authors: Aso, Keigo, Hayashi, Akitoshi, Tatsumisago, Masahiro
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 30.11.2012; Elsevier
• Subjects: All-solid-state lithium battery; Applied sciences; Carbon fiber; Chemistry; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrochemistry; Exact sciences and technology; General and physical chemistry; High-boiling solvent; NiS; Solid electrolyte; All-solid-state lithium battery; NiS; High-boiling solvent; Solid electrolyte; Carbon fiber; Secondary cell; Boiling; Composite material; Lithium battery; Solid state; Solid state device; Lithion ion batteries; Chemical synthesis; Solvent; Electrical characteristic
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2012.07.088

Newly designed composites of nickel sulfide (NiS) and vapor grown carbon fiber (VGCF) for use in all-solid-state lithium secondary batteries were synthesized using thermal decomposition of nickel acetylacetonate and 1-dodecanethiol in a mixture of VGCF and 1-octadecene. X-ray diffraction measurements and transmission electron microscopy revealed that NiS nanoparticles of 50nm diameter were grown on the surface of vapor grown carbon fiber. All-solid-state cells using 80Li2S·20P2S5 (mol%) glass–ceramic were fabricated as a solid electrolyte. The cell using the mixture of the NiS–VGCF composite and the solid electrolyte as a working electrode showed initial discharge capacity of 590mAhg−1 at 1.3mAcm−2, and exhibited better cycle performance than the cell using the mixture of NiS, solid electrolyte, and VGCF. Electrochemical performance in all-solid-state batteries was improved by forming a favorable solid–solid interface between NiS active materials and VGCF as electron conduction paths in the working electrode.