Na3MnCO3PO4 – A High Capacity, Multi-Electron Transfer Redox Cathode Material for Sodium Ion Batteries

Significance Statement

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.

Journal Reference

Electrochimica Acta, Volume 161, 2015, Pages 322-328. Chuanlong Wang1,2, Monica Sawicki1,2, Satya Emani1,2, Caihong Liu1,2, Leon L. Shaw1,2

  1. Department of Mechanical, Materials and Aerospace Engineering, USA.
  2. Wanger Institute for Sustainable Energy Research, Illinois Institute of Technology, Chicago, USA.

Abstract

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 Na3MnCO3POcan 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.

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