Please use this identifier to cite or link to this item:
|Title:||Li2MnSiO4 obtained by microwave assisted solvothermal method: Electrochemical and surface studies|
|Authors:||Kuezma, M. |
|Source:||Kuezma, M., Devaraj, S., Balaya, P. (2012-10-21). Li2MnSiO4 obtained by microwave assisted solvothermal method: Electrochemical and surface studies. Journal of Materials Chemistry 22 (39) : 21279-21284. ScholarBank@NUS Repository. https://doi.org/10.1039/c2jm34455f|
|Abstract:||Nanostructured nominally pure Li2MnSiO4 (LMS) is successfully synthesized by a microwave assisted solvothermal method followed by successful coating with conductive carbon using carbonizing agents such as d-(+)-glucono-1,5-lactone (GA) and citric acid (CA). CA is found to be a better carbonizing agent than GA as it shows two times higher capacity than GA. Reversible capacity of 250 mA h g-1 is obtained for carbon coated LMS at C/10 with flat charge/discharge plateau in the narrow potential window 2.0 to 4.5 V vs. Li/Li+. Capacity fades drastically after the first few cycles with a sloppy charge/discharge profile. The possible mechanism for the observed discharge plateau is discussed on the basis of XPS method and electrochemical testing. Ex situ XPS analysis confirms that such a large capacity (exchange of more than one mol of Li per compound reaction) after the first charging of the Li2MnSiO4 material is connected with the complete oxidation of Mn2+ to Mn4+ on the surface. To the best of our knowledge, the Mn4+ oxidation state is confirmed experimentally for the first time in the case of the manganese orthosilicate cathode material that exhibits best theoretical capacity of 330 mA h g -1. This journal is © 2012 The Royal Society of Chemistry.|
|Source Title:||Journal of Materials Chemistry|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Feb 13, 2018
WEB OF SCIENCETM
checked on Jan 15, 2018
checked on Feb 18, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.