Understanding the Electrochemical Mechanism of K-αMnO2 for Magnesium Battery Cathodes
Authors:
- 7 May 2014
- journal article
- letter
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 6 (10) , 7004-7008
Abstract
Batteries based on magnesium are an interesting alternative to current state-of-the-art lithium-ion systems; however, high-energy-density cathodes are needed for further development. Here we utilize TEM, EDS, and EELS in addition to soft-XAS to determine electrochemical magnesiation mechanism of a high-energy density cathode, K-αMnO2. Rather than following the typical insertion mechanism similar to Li+, we propose the gradual reduction of K-αMnO2 to form Mn2O3 then MnO at the interface of the cathode and electrolyte, finally resulting in the formation of K-αMnO2@(Mg,Mn)O core–shell product after discharge of the battery. Understanding the mechanism is a vital guide for future magnesium battery cathodes.Keywords
This publication has 26 references indexed in Scilit:
- Highly Reversible Mg Insertion in Nanostructured Bi for Mg Ion BatteriesNano Letters, 2013
- Mg rechargeable batteries: an on-going challengeEnergy & Environmental Science, 2013
- A high energy-density tin anode for rechargeable magnesium-ion batteriesChemical Communications, 2012
- Electrodeposited Bi, Sb and Bi1-xSbx alloys as anodes for Mg-ion batteriesElectrochemistry Communications, 2012
- Electrolyte roadblocks to a magnesium rechargeable batteryEnergy & Environmental Science, 2012
- On the Way to Rechargeable Mg Batteries: The Challenge of New Cathode MaterialsChemistry of Materials, 2009
- Building better batteriesNature, 2008
- Prototype systems for rechargeable magnesium batteriesNature, 2000
- Magnesium insertion electrodes for rechargeable nonaqueous batteries — a competitive alternative to lithium?Electrochimica Acta, 1999
- Nonaqueous Electrochemistry of Magnesium: Applications to Energy StorageJournal of the Electrochemical Society, 1990