Synthesis of NiS-carbon fiber composites in high-boiling solvent to improve electrochemical performance in all-solid-state lithium secondary batteries
Synthesis of NiS-carbon fiber composites in high-boiling solvent to improve electrochemical performance in all-solid-state lithium secondary batteries
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DOI：
10.1016/j.electacta.2012.07.088
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发表时间：
2012-11
影响因子：
6.6
通讯作者：
K. Aso;A. Hayashi;M. Tatsumisago
中科院分区：
文献类型：
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作者：
K. Aso;A. Hayashi;M. Tatsumisago
以乙酰丙酮镍（NiS）和1-十二烷基乙炔（1-decodanetherene）为原料，在气相生长碳纤维（VGCF）和1-十八烯（1-octadecene）的混合物中热分解，制备了一种新型的用于全固态锂二次电池的硫化镍（NiS）/VGCF复合材料。X射线衍射和透射电子显微镜分析表明，在气相生长碳纤维表面生长出了直径为50 nm的NiS纳米颗粒。采用80 Li 2S·20 P2 S5（mol%）微晶玻璃作为固体电解质，制备了全固态电池。使用NiS-VGCF复合物和固体电解质的混合物作为工作电极的电池在1.3mAcm-2下显示出590 mAhg-1的初始放电容量，并且表现出比使用NiS、固体电解质和VGCF的混合物的电池更好的循环性能。通过在工作电极中形成NiS活性材料与VGCF之间的良好固-固界面作为电子传导路径，提高了全固态电池的电化学性能。
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−1at 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.