4. Conclusion
SCNTs
and SNCNTs have been successfully synthesized by calcination of CNTs and
NCNTs in SO2-containing atmosphere. Recycling of S
species has been realized with the design of SO2generator and absorber, where SO2 is generated by
CaSO3 pyrolysis and absorbed by CaO, respectively. A
delayed SO2 release at a temperature slop from 715 to
800 ÂșC is selected to match with the gaseous S doping reaction. Whether
in the organic system or aqueous system, the LFP cathode with the SCNT-S
as conductive additive exhibits higher capacity and better rate
performance as compared to the electrode with the pristine CNTs. Our
results provide a novel method to synthesize high quality SCNTs at large
scale and low cost.