Co-Ni@N doped carbon nanotubes: a promising cathode with excellent performance for lithium sulfur batteries

摘要

The carbon-based materials including carbon nanotubes,mesoporous carbon,graphene,polymer/biomass derived carbon,and metal-organic frameworks derived carbon,have pores or interlayer spaces that can be applied to physically confine polysulfides.However,during the long-term cycling,the hydrophilic polysulfides species often out-diffuse due to the poor affinity of nonpolar carbon for polarized polysulfides1.In this case,the development of novel functional carbons with an ability to effectively chemical bind polysulfides is particularly significant and challenging.In this work,a strategy for fabrication of cobalt and nickelembedded nitrogen-doped carbon nanotubes(Co-Ni@NCNTs)with low-cost melamine as the carbon and nitrogen source as well as cobalt and nickel salt as a nonprecious metal precursor through the calcination method.The electrochemical performance of Co-Ni@NCNTs/S cathode for the lithium sulfur batteries was tested between 1.7 and 2.8 V by using Land-CT2001 automatic battery tester.