Investigation of Li+ insertion in columbite structured FeNb2O6 and rutile structured CrNb2O6 materials. (20th January 2015)

• Record Type: Journal Article
• Authors: Samarasingha, Pushpaka B.; Thomas, Chris I.; Fjellvåg, Helmer
• Is Part Of: Electrochimica acta. Volume 153(2015)
• Page Start: 232
• Page End: 237
• Publication Date: 2015-01-20
• Subjects: Batteries -- cathode -- columbite -- niobates -- lithium intercalation; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2014.12.004
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: FeNb2 O6 and CrNb2 O6 cathode materials achieved. Reversible lithium insertion proved in both FeNb2 O6 and CrNb2 O6 . Nb(V)/Nb(IV) redox couple dominant rather than Cr(III)/Cr(II). Initial drop in capacity interpreted as a result of channel blocking. Strategies for future material developments proposed. Abstract: Lithium insertion in FeNb2 O6 and CrNb2 O6 has been investigated using the galvanostatic charge–discharge method and showed that more than half of the intercalated Li + during first cycle is retained in the structure and is not de-intercalated during subsequent cycles. The effects of sintering on FeNb2 O6 were investigated with lower applied temperatures yielding higher Li + intercalation capability. Post galvanostatic XRD shows that the initial phase has been retained during cell cycling. Cyclic voltammetry reveals that chromium also takes part in electro-chemical activity in CrNb2 O6 .