Qiong Zheng
Dalian Institute of Chemical Physics, China
Title: Facile synthesis of nanoscale laminated Na3V2 (PO4)3 for high performance sodium ion battery cathode
Biography
Biography: Qiong Zheng
Abstract
A facile synthesis of nanoscale laminated Na3V2 (PO4)3 for high performance sodium ion battery cathode is firstly proposed. In the synthesis process, a crystallized intermediate precursor with low cost raw materials is prepared by introducing a high temperature melton-state NH3 thermal reduction process, which acts as a reaction template to control the crystal growth and the morphology of the final product-Na3V2(PO4)3 (X-NVP). The synthesized nanoscale laminated structure of X-NVP cathode shows high discharge specific capacity and decent rate performance. At low rate of 0.5C, the discharge specific capacity is in the proximity of 117mAh g-1, which is very close to its theoretical specific capacity (117.6 mAh g-1), and there is only a very small capacity fade after 250 cycles at 2C. Even at 50C, the discharge specific capacity is higher than 80 mAh g-1 and the reversible capacity retention after 3000 cycles keeps higher than 78%. The intermediate precursor prepared by the high temperature melton-state thermal reduction method, acting as the reaction template of the final product, provides a solution for the synthesis of high-performance sodium ion battery cathode materials with excellent crystallinity and homogeneous nanoscale laminated structure.