Large-scale electric energy storage is a key enabler for the use of renewable energy. Recently, Na-ion batteries has been promoted as an alternative low-cost technology for such application. The authors demonstrated for the first time that Na3MnCO3PO4 has a great potential to be a novel cathode material for Na-ion batteries. This study advances Na-ion battery research and bring it a step closer to a sustainable large-scale energy storage system.
Electrochimica Acta, Volume 161, 2015, Pages 322-328. Chuanlong Wang1,2, Monica Sawicki1,2, Satya Emani1,2, Caihong Liu1,2, Leon L. Shaw1,2
- Department of Mechanical, Materials and Aerospace Engineering, USA.
- Wanger Institute for Sustainable Energy Research, Illinois Institute of Technology, Chicago, USA.
Na3MnCO3PO4 has been predicted via ab initio calculations (Hautier et al., 2011) to have a high specific capacity of 191 mAh/g, owing to its potential to deliver two-electron transfer reactions per formula via Mn2+/Mn3+ and Mn3+/Mn4+ redox reactions. This study demonstrates, for the first time, that Na3MnCO3PO4 can indeed display a specific capacity of 176.7 mAh/g experimentally, reaching 92.5% of its theoretical. The low electronic conductivity is found to be the limiting factor for the previously observed low specific capacities for Na3MnCO3PO4. With a specific capacity as high as 176.7 mAh/g, Na3MnCO3PO4 has a great potential to be a viable cathode material for Na-ion batteries.