Please use this identifier to cite or link to this item: https://doi.org/10.1002/adfm.200600997
Title: Nanophase ZnCo2O4 as a high performance anode material for Li-ion batteries
Authors: Sharma, Y.
Sharma, N. 
Subba Rao, G.V. 
Chowdari, B.V.R. 
Issue Date: 15-Oct-2007
Citation: Sharma, Y., Sharma, N., Subba Rao, G.V., Chowdari, B.V.R. (2007-10-15). Nanophase ZnCo2O4 as a high performance anode material for Li-ion batteries. Advanced Functional Materials 17 (15) : 2855-2861. ScholarBank@NUS Repository. https://doi.org/10.1002/adfm.200600997
Abstract: ZnCo2O4 has been synthesized by the low-temperature and cost-effective urea combustion method. X-ray diffraction (XRD), HR-TEM and selected area electron diffraction (SAED) studies confirmed its formation in pure and nano-phase form with particle size ∼15-20 nm. Galvanostatic cycling of nano-ZnCo2O4 in the voltage range 0.005-3.0 V versus Li at 60 mA g-1 gave reversible capacities of 900 and 960 mA hg -1, when cycled at 25°C and 55°C, respectively. These values correspond to ∼8.3 and ∼ 8.8 mol of recyclable Li per mole of ZnCo 2O4. Almost stable cycling performance was exhibited in the range 5-60 cycles at 60 mA g-1 and at 25°C with ∼ 98 % coulombic efficiency. A similar cycling stability at 55°C, and good rate-capability both at 25 and 55°C were found. The average discharge- and charge-potentials were ∼1.2 V and ∼1.9 V, respectively. The ex-situ-XRD, -HRTEM, -SAED and galvanostatic cycling data are consistent with a reaction mechanism for Li-recyclability involving both de-alloying-alloying of Zn and displacement reactions, viz., LiZn ↔ Zn ↔ ZnO and Co ↔ CoO ↔ Co3O4. For the first time we have shown that both Zn- and Co-ions act as mutual beneficial matrices and reversible capacity contribution of Zn through both alloy formation and displacement reaction takes place to yield stable and high capacities. Thus, nano-ZnCo2O4 ranks among the best oxide materials with regard to Li-recyclability. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.
Source Title: Advanced Functional Materials
URI: http://scholarbank.nus.edu.sg/handle/10635/97293
ISSN: 1616301X
DOI: 10.1002/adfm.200600997
Appears in Collections:Staff Publications

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

SCOPUSTM   
Citations

478
checked on Dec 5, 2019

WEB OF SCIENCETM
Citations

464
checked on Dec 5, 2019

Page view(s)

51
checked on Nov 30, 2019

Google ScholarTM

Check

Altmetric


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