Carbon-sulfur composite, method for preparing same, and positive electrode and lithium secondary battery comprising same

• Main Authors: CHO EUNKYUNG, YANG DOO KYUNG, HAN SEUNG-HOON, SONG MYUNG-JUN, SOHN KWON-NAM, KIM JI-WON, KIM IL-TO, SHIN MOO-WHAN
• Format: Patent
• Language: Chinese; English
• Published: 23.05.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a carbon-sulfur composite, a method for preparing the same, and a positive electrode and a lithium secondary battery comprising the same. The carbon-sulfur composite includes: a carbonized metal-organic framework (MOF); and a sulfur compound introduced into at least a portion of an outer surface and an interior of the carbonized metal-organic framework, in which the carbonized metal-organic framework has a specific surface area of 2500 m2/g to 4000 m2/g, and the carbonized metal-organic framework has a pore volume of 0.1 cc/g to 10 cc/g. The electrochemical performance of the lithium-sulfur battery, such as the initial discharge capacity or the cycle retention capacity, can be effectively improved only by adjusting the carbonization temperature under the condition that other methods do not need to be introduced. 本发明涉及碳-硫复合物、其制备方法以及包含其的正极和锂二次电池。所述碳-硫复合物包含：碳化的金属-有机框架(MOF)；和硫化合物，所述硫化合物被引入到所述碳化的金属-有机框架的外表面和内部的至少一部分中，其中所述碳化的金属-有机框架具有2500m2/g至4000m2/g的比表面积，并且所述碳化的金属-有机框架具有0.1cc/g至10