Preparing And The Electrochemical Performance Of Vanadium Pentoxide And Sulfur Cathode For Lithium Ion Batteries

The cathode materials perform the key factor for lithium ion batteries（LIBs）. In this case, the findings of cathode are significant. As we know, LIBs have delivered widely application in our life, including various electronics and electric vehicles. However, the energy density and the endurability are the most important obstacle. There are two work in this paper, synthesis and the performance of vanadium pentoxide cathode and sulfur cathode. As about the poor conductivity, we have took some measures, such as decline the size into nanometer and add conductive additive.Vanadium pentoxide（V₂O₅） has received considerable attention owing to its potential application in energy storage with high specific capacity（294 mAh g-1）. However, the development of V₂O₅ cathodes has been limited by the intrinsically low electrical conductivity and slow electrochemical kinetics resulting in a significant capacity decay. In this article, in order to overcome the issues, V₂O₅ nanospheres and multiwalled carbon nanotubes（MWCNTs） are used to fabricate layer-by-layer composited paper as the cathode, which is prepared via electrostatic interaction and vacuum filtration by alternating the positively charged V₂O₅ nanospheres and the negatively charged terminated MWCNT solutions. As a result, the V₂O₅ nanospheres are closely intercalated between the adjacent MWCNT layers leading to minimize the disadvantage voids and enhance the overall conductivity of the composited electrode. At 1.0C, the capacity still can retain 200mAhg-1, even after 100 cycling, which still exhibits an enhanced cycling durability as well as improved rate capability.Lithium sulfur（Li-S） batteries have been regarded as the next-generation batteries for the enhanced energy density. A carbon host with high special surface and stable structure for lithium sulfur batteries has attracted a lot of attention, where porous carbon material reveals fancy structural advantages. In this work, we successfully fabricate nitrogen doped porous carbon net-work. The synergy effect between conductive carbon framework and unique binding capability of the N functional groups can effectively restrict the solution of intermediate. The current density at 2.0C, each cycle reveal only 0.057% capacity decay in 500 cycles test.