Roles of Processing, Structural Defects and Ionic Conductivity in Electrochemical Performance of Na3MnCO3PO4 cathode Material

Monday, 25 May 2015: 10:00
Salon A-5 (Hilton Chicago)
C. Wang (Illinois Institute of Technology, Wanger Institute for Sustainable Energy Research), J. A. Kaduk (Illinois Institute of Technology), and L. Shaw (Illinois Institute of Technology, Wanger Institute for Sustainable Energy Research)
Na3MnCO3PO4 with a potential to deliver two-electron transfer reactions per formula via Mn2+/Mn3+ and Mn3+/Mn4+ redox reactions and a high theoretical capacity (191 mAh/g) can play an important role in Na-ion batteries. This study investigates the dependence of the electrochemical performance of Na3MnCO3PO4-based sodium-ion batteries on processing, structural defects and ionic conductivity. Na3MnCO3PO4 has been synthesized via hydrothermal process under various conditions with and without the subsequent high-energy ball milling. Particle sizes, structural defects and ionic conductivity have been studied as a function of processing conditions. It is found that structural defects have a strong influence on ionic conductivity, which in turn, affects the charge/discharge capacity of the Na3MnCO3PO4-based sodium-ion batteries. In contrast, particle size effect is small. These results provide guidelines for rational design and synthesis of high capacity Na3MnCO3PO4 for Na-ion batteries in the near future.