78results about How to "Good conductive path" patented technology

Objects of the present invention is to provide a carbon nanohorn aggregate excellent in imparting conductivity, and to provide a carbon nanohorn aggregate excellent in both the impartation of conductivity and the dispersibility. The present invention provides a fibrous carbon nanohorn aggregate in which a plurality of single-walled carbon nanohorns are aggregated in a fibrous state. The fibrous carbon nanohorn aggregate is excellent in imparting conductivity, and can be produced by the same process as production of globular carbon nanohorn aggregates, whereby the carbon nanohorn aggregates containing fibrous ones and globular ones mixed therewith can satisfy both high conductivity and high dispersibility.

The invention relates to the field of lithium sulfur batteries for electrochemical energy storage and in particular relates to a preparation method and application of a high-energy density lithium sulfur battery electrode. The preparation method comprises the following steps: preparing a three-dimensional conductive carbon fiber network; mixing carbon nano tubes, conductive carbon black and elemental sulfur to form uniform elemental sulfur slurry, by taking the three-dimensional conductive carbon fiber network as a current collector, directly immersing the three-dimensional conductive carbon fiber network in the elemental sulfur slurry, injecting the elemental sulfur slurry for drying, forming a carbon / sulfur composite lithium sulfur battery electrode through which sulfur is uniformly distributed in the three-dimensional conductive carbon fiber network, and further assembling the battery to prepare the high-energy density lithium sulfur battery. By utilizing the three-dimensional flexible high-conductivity carbon fiber network and highly dispersed elemental sulfur slurry in the electrode preparation process, a positive electrode material with high sulfur loading capacity is obtained, so that extremely high specific capacity and excellent cycle performance are achieved under the condition that the lithium sulfur battery is high in sulfur loading capacity in unit area.

The invention discloses a method for improving the thermoelectric performance of bismuth sulfide polycrystal, which belongs to the technical field of energy materials. It is characterized in that: bismuth sulfide nano powder prepared by mechanical alloying method is mixed with (001) oriented single crystal bismuth sulfide nano rod powder synthesized by hydrothermal method, ultrasonically dispersed in absolute ethanol for 10 to 200 minutes, baked Grind by hand in an agate mortar and pestle for 10-100 minutes after drying. The ground powder is placed in a graphite mold, sintered at 300-500°C by a spark plasma sintering process, and held for 0-30 minutes to prepare a bismuth sulfide polycrystalline block. Spark plasma sintering has a fast heating speed, which inhibits the growth and fusion of grains, keeps the single crystal nanorod structure in the polycrystalline bulk, forms a fast channel for carrier migration, and greatly improves the electrical transport performance and Thermoelectric properties, the method has the advantages of simple required equipment, easy operation, low cost, remarkable effect and the like.