Bi2S3 is a promising negative electrode material for lithium storage owing to its high theoretical capacity. During the Bi2S3/C synthesis process, the carbonization of H3BTC prevents aggregation of Bi2S3 particles, with an average diameter of 60 nm.
In this study, metal organic frameworks (MOFs) are prepared as a support to tether active selenium through melt-diffused method, in which MnO 2 nanoparticles are loaded on the surface of a Co-MOF (ZIF-67) through simple postmodification means. Selenium is uniformly dispersed on the surface of ZIF-67, and MnO 2 nanoparticles (∼5 nm in diameter) are coated on the surface of Se. As an analogue of sandwich, the MOF@Se@metal-oxide structure can inhibit the shuttle effect and dissolution of polyselenides in the electrolyte, which is confirmed by the cyclic voltammetry, galvanostatic discharge/charge, and electrochemical impedance tests. In addition, the cathode displays an excellent electrochemical performance. Especially, the discharge capacity of the ZIF-67@ Se@MnO 2 cathode is 329 mA h g −1 after 100 cycles at 1C (C = 675 mA g −1 ) with the high capacity retention of 83.7%. Furthermore, the ZIF-67@Se@MnO 2 cathode displays stable capacities of 273 and 232 mA h g −1 after 100 cycles at 2C and 5C, respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.