Nitrogen-doped carbon-coated Li3V2(PO4)3 as cathode materials for high-performance lithium storage

A series of novel N-doped carbon-coated Li3V2(PO4)(3) (LVPC/N) composites were synthesized by rheological phase method with melamine as nitrogen source. The results showed that N-doping did not affect the main structure of Li3V2(PO4)(3)/C (LVPC) but only changed the structure and properties of the coating layer, which effectively improved the structural stability and electrochemical performance of LVPC. When the ratio of citric acid to melamine was 5:3, the properties of LVPCN composite were the best. The initial discharge specific capacity was 195 mAh g(-1) at 30 mA g(-1) in the voltage range of 3.0-4.8 V. After 100 cycles of charge and discharge, the discharge capacity was still 165 mAh g(-1), and the capacity retention rate was increased to 85%. Owing to the low cost, high initial discharge capacity, and long lifespan, we believe that the LVPC/N composite is significantly competitive to other cathode materials for application in lithium-ion batteries.

Automated summary

The study synthesized a series of novel N-doped carbon-coated Li3V2(PO4)(3) composites by rheological phase method, with N-doping improving the structural stability and electrochemical performance of LVPC. The best properties were achieved when the ratio of citric acid to melamine was 5:3.