Activation of nano-Ca2MnO4 for electrochemical lithium intercalation. Issue 1805 (7th August 2015)

• Record Type: Journal Article
• Authors: Surace, Yuri; Simões, Mário; Karvonen, Lassi; Battaglia, Corsin; Pokrant, Simone; Weidenkaff, Anke
• Editors: Augustynski, J.; Grosse, F.; Kumar, D.; Sanchez, F.; Santato, C.; Sun, X.W.; Vomiero, A.; Yamamoto, T.
• Is Part Of: MRS proceedings. Issue 1805(2015)
• Publication Date: 2015-08-07
• Subjects: energy storage, -- sol-gel, -- core/shell; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2015.742
• Languages: English
• ISSNs: 0272-9172

Abstract

ABSTRACT: Ca2 MnO4 nanoparticles were prepared by the Pechini method and acid treated to extract Ca 2+ ions. Structural, morphological and spectroscopic analyses by XRD, SEM/EDX, TEM/EDS and Raman revealed the formation of an amorphous outer layer at the particles surface with a preserved inner crystalline bulk. Thanks to the outer layer, which is electrochemically active, the acid-treated compounds showed capacity up to 150 Ah/kg. The crystalline bulk improved cycling stability, allowing reaching capacity retention up to 70% after 30 cycles.