Multilayer porous carbon material, preparation method thereof, lithium sulfur battery positive electrode and lithium sulfur battery

• Main Authors: WAN LIHAO, LI MINGXIAN, WU JINGLUO, ZHOU KUAN, YU QIANGQIANG
• Format: Patent
• Language: Chinese; English
• Published: 08.03.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; NANOTECHNOLOGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

The invention belongs to the technical field of lithium-sulfur battery materials, and particularly discloses a multilayer porous carbon material, a preparation method thereof, a lithium sulfur batterypositive electrode and a lithium-sulfur battery. The preparation method includes following steps: mixing graphite oxide, calcium salt and sodium citrate to obtain colloid; heating the colloid to obtain a powdery material; mixing magnesium powder with the powdery material to obtain a mixed material, putting the mixed material into oxygen-free environment for calcining, and pickling a product obtained by calcining to obtain the multilayer porous carbon material. The multilayer porous carbon material prepared by the method has rich holes, small cavities and prints, is suitable for serving as a carrier of elemental sulfur of the lithium-sulfur battery and capable of effectively improving electrochemical performance of the lithium-sulfur battery. 本发明属于锂硫电池材料技术领域，具体公开种多层多孔碳材料及其制备方法、锂硫电池正极和锂硫电池。所述多层多孔碳材料的制备方法包括以下步骤：将氧化石