Please use this identifier to cite or link to this item:
Title: Nanoflake CoN as a high capacity anode for Li-ion batteries
Authors: Das, B.
Reddy, M.V. 
Malar, P. 
Osipowicz, T. 
Subba Rao, G.V. 
Chowdari, B.V.R. 
Keywords: Anodes
Electrochemical behavior
Li-ion batteries
Thin films
Issue Date: 16-Jul-2009
Citation: Das, B., Reddy, M.V., Malar, P., Osipowicz, T., Subba Rao, G.V., Chowdari, B.V.R. (2009-07-16). Nanoflake CoN as a high capacity anode for Li-ion batteries. Solid State Ionics 180 (17-19) : 1061-1068. ScholarBank@NUS Repository.
Abstract: CoN films with nanoflake morphology are prepared by RF magnetron sputtering on Cu and oxidized Si substrates and characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM) and selected area electron diffraction (SAED) techniques. The thickness and composition of the films are determined by the Rutherford back scattering (RBS) technique confirming the stoichiometric composition of CoN with a thickness, 200 (± 10) nm. Li-storage and cycling behavior of nanoflake CoN have been evaluated by galvanostatic discharge-charge cycling and cyclic voltammetry (CV) in cells with Li-metal as counter electrode in the range of 0.005-3.0 V at ambient temperature. Results show that a first-cycle reversible capacity of 760 (± 10) mAhg- 1 at a current rate 250 mAg- 1(0.33 C) increases consistently to yield a capacity of 990 (± 10) mAhg- 1 after 80 cycles. The latter value corresponds to 2.7 mol of cyclable Li/mol of CoN vs. the theoretical, 3.0 mol of Li. Very good rate capability is shown when cycled at 0.59 C (up to 80 cycles) and at 6.6 C (up to 50 cycles). The coloumbic efficiency is found to be 96-98% in the range of 10-80 cycles. The average charge and discharge potentials are 0.7 and 0.2 V, respectively for the decomposition/formation of Li3N as determined by CV. However, cycling to an upper cut-off voltage of 3.0 V is essential for the completion of the "conversion reaction". Based on the ex-situ-XRD, -HR-TEM and -SAED data, the plausible Li-cycling mechanism is discussed. The results show that nanoflake CoN film is a prospective anode material for Li-ion batteries. © 2009 Elsevier B.V. All rights reserved.
Source Title: Solid State Ionics
ISSN: 01672738
DOI: 10.1016/j.ssi.2009.05.007
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Nov 25, 2021


checked on Nov 25, 2021

Page view(s)

checked on Nov 18, 2021

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.