Abstract:
The present invention relates to a composite oxide-based cathode active material for a magnesium secondary battery represented by Mg_yMA_2O_7-zC_z and a magnesium secondary battery comprising the same. The cathode active material for a magnesium secondary battery of the present invention has a new structure in which polyanions form a framework and magnesium ions are chemically or electrochemically inserted or separated to/from a channel or a tunnel existing between the framework formed by the polyanions so as to not only improve electroconductivity by facilitating the movement of magnesium ions among particles but also express relatively high stability, a long lifespan and excellent thermal properties in comparison with an existing magnesium secondary battery of which the crystalline structure collapses during the movement of the magnesium ions.
Abstract:
The present invention provides a cathode active material for a magnesium secondary battery which is represented by the chemical formula: MgxMnySiO4 (1
Abstract translation:本发明提供一种镁化合物的正极活性物质,它由化学式为Mg x Mn x Si 4(1≤x≤1.2,0.8≤y≤1.0)表示,并且其表面被碳覆盖。 根据本发明的用于镁二次电池的正极活性材料具有涂覆有碳的表面,以便抑制颗粒的生长并形成均匀的颗粒,具有高的表面积以促进离子在颗粒之间移动并提高导电性 通过提高包含镁二次电池用正极活性物质的电极的结构稳定性,提高了镁二次电池的初期容量和高速率特性。
Abstract:
PURPOSE: A carbon-graphite-metal composite-based bipolar plate is provided to improve corrosion resistance while having low specific resistance and to improve energy efficiency and life time of a redox flow secondary battery. CONSTITUTION: A carbon-graphite-metal composite-based bipolar plate comprises 10-20 wt% of carbon-based material, 45-77 wt% of graphite-based material, 1-25 wt% of metal, 8-18 wt% of a resin, 3.99-10 wt% of a curing agent, 0.01-2 wt% of a curing accelerator. The metal is selected from a group consisting of aluminum, copper, nickel, iron, manganese, iridium and platinum. The carbon-based material has an average particle size of 10 micron or less and the graphite-based material has an average particle size of 50 micron or less. A redox flow secondary battery comprises the carbon-graphite-metal composite-based bipolar plate(50).