Cycle oxide cathodes

Wang and coworkers synthesized the PPy/V O hollow micro-spherical hybrid by in-situ polymerization method as cathode material for LIB. Compared to bare electrode (32.7% retention), this PPy/oxide cathode exhibits slightly reduced capacity and substantially improved cyclabil-ity (89.1% retention after 50 cycles), and it was demonstrated that the reduction in the capacity is due to the partial reduction of vanadium during the polymerization of polymer [41],... 

Formation mechanism of SEI layers on cathodes in Li-ion batteries, their thermal and electrochemical stabihty, and their roles in affecting the cycle life and safety characteristics are well documented by many researchers [43 6]. Here we present some recent data on identifying the surface layer generation and their composition on transition metal oxide cathodes like spinel and layered materials by various spectroscopic techniques. The structural changes and the reaction at the surface during the first delithiation process in Li-rich layered material are explained. The effects of additives and coatings on electrode materials to their electrochemical performance are also discussed at the end. 

The effects of a small amoimt of fluoroethylene carbonate C3H3FO3 on the electrochemical performance of a hthium-rich layered oxide cathode have been assessed (56). When 1% or 2% by volume of C3H3FO3 was introduced into the electrolyte, the cycling... 

---