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Title: Lithium recycling behaviour of nano-phase-CuCo2O4 as anode for lithium-ion batteries
Authors: Sharma, Y.
Sharma, N. 
Rao, G.V.S.
Chowdari, B.V.R. 
Keywords: Anode material
Li-ion batteries
Rate capability
Spinel structure
Issue Date: 8-Nov-2007
Citation: Sharma, Y., Sharma, N., Rao, G.V.S., Chowdari, B.V.R. (2007-11-08). Lithium recycling behaviour of nano-phase-CuCo2O4 as anode for lithium-ion batteries. Journal of Power Sources 173 (1) : 495-501. ScholarBank@NUS Repository.
Abstract: Nano-CuCo2O4 is synthesized by the low-temperature (400 °C) and cost-effective urea combustion method. X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM) and selected area electron diffraction (SAED) studies establish that the compound possesses a spinel structure and nano-particle morphology (particle size (10-20 nm)). A slight amount of CuO is found as an impurity. Galvanostatic cycling of CuCo2O4 at 60 mA g-1 in the voltage range 0.005-3.0 V versus Li metal exhibits reversible cycling performance between 2 and 50 cycles with a small capacity fading of 2 mAh g-1 per cycle. Good rate capability is also found in the range 0.04-0.94C. Typical discharge and charge capacity values at the 20th cycle are 755(±10) mAh g-1 (∼6.9 mol of Li per mole of CuCo2O4) and 745(±10) mAh g-1 (∼6.8 mol of Li), respectively at a current of 60 mA g-1. The average discharge and charge potentials are ∼1.2 and ∼2.1 V, respectively. The underlying reaction mechanism is the redox reaction: Co ↔ CoO ↔ Co3O4 and Cu ↔ CuO aided by Li2O, after initial reaction with Li. The galvanostatic cycling studies are complemented by cyclic voltammetry (CV), ex situ TEM and SAED. The Li-cycling behaviour of nano-CuCo2O4 compares well with that of iso-structural nano-Co3O4 as reported in the literature. © 2007.
Source Title: Journal of Power Sources
ISSN: 03787753
DOI: 10.1016/j.jpowsour.2007.06.022
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