SULFUR-CARBON COMPOSITE COMPRISING A HIGHLY GRAPHITIC CARBON MATERIAL FOR LITHIUM-SULFUR BATTERIES AND PROCESS FOR PREPARING THE SAME

• Main Authors: ZHAO NAHONG, ZHANG JUAN, CHEN YUNHUA, GUO YUGUO, YIN YAXIA
• Format: Patent
• Language: Chinese; English
• Published: 31.07.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Provided is a sulfur-carbon composite comprising a highly graphitic carbon material and sulfur, wherein the carbon material has a high graphitization degree characterized by a ratio of the intensity of G band to the intensity of D band in Raman spectrum being more than 1.0, the material is either a graphitic microporous carbon substrate, or a core-shell material with a conductive core coated by agraphitic microporous carbon layer, and wherein sulfur is encapsulated into the porous structure of the carbon material. Also provided are an electrode and a lithium-sulfur battery comprising the sulfur-carbon composite, and a process for preparing the sulfur-carbon composite. 本发明涉及种包含高石墨化的碳材料和硫的硫-碳复合材料，其中高石墨化的碳材料具有较高的石墨化程度，其特征在于在拉曼光谱中G带与D带的强度比大于1.0，所述材料或者是石墨化的微孔碳基质，或者是由石墨化的微孔碳层包覆导电内核的核-壳材料；其中硫被封装在所述高石墨化的碳材料的多孔结构中，本发明还涉及包含所述硫-碳复合材料的电极和锂-硫电池，以及制备所述硫-碳复合材料的方法。