Utilizing Cyclic Voltammetry to Understand the Energy Storage Mechanisms for Copper Oxide and its Graphene Oxide Hybrids as Lithium-Ion Battery Anodes

Autor: Cameron Day, David Crossley, Katie Greig, Jennifer Peake, Robert A. W. Dryfe, Alexander Massey
Rok vydání: 2020
Předmět:
Zdroj: Day, C, Greig, K, Massey, A, Peake, J, Crossley, D & Dryfe, R 2019, ' Utilising Cyclic Voltammetry to Understand the Energy Storage Mechanisms of Copper Oxide and its Graphene Oxide Hybrids as Lithium Ion Battery Anode Materials ', Chemsuschem . https://doi.org/10.1002/cssc.201902784
Chemsuschem
ISSN: 1864-564X
Popis: Graphene‐based materials have been extensively researched as a means improve the electrochemical performance of transition metal oxides in Li‐ion battery applications, however an understanding of the effect of the different synthesis routes, and the factors underlying the oft‐stated better performance of the hybrid materials (compared to the pure metal oxides) is not always demonstrated. For the first time, we report a range of synthetic routes to produce graphene oxide (GO)‐coated CuO, micro‐particle/GO “bundles” as well as nano‐particulates decorated on GO sheets to enable a comparison with CuO and its carbon‐coated analogue, as confirmed using scanning electron microscopy (SEM) imaging and Raman spectroscopy. Cyclic voltammetry was utilized to probe the lithiation/delithiation mechanism of CuO by scanning at successively decreasing vertex potentials, uncovering the importance of a full reduction to Cu metal on the reduction step. The GO hybrid materials clearly show enhanced specific capacities and cycling stabilities comparative to the CuO, with the most promising material achieving a capacity of 746 mAh g−1 and capacity retention of 92 % after 30 cycles, which is the highest stable capacity quoted in literature for CuO. The simple cyclic voltammetry technique used in this work could be implemented to help further understand any conversion‐type anode materials, in turn accelerating the research and industrial development of conversion anodes.
Performance in preparation: Graphene oxide/copper oxide composites are prepared using a variety of hydrothermal methods. The performance of these materials as lithium‐ion battery anodes is compared using charge–discharge and voltammetric measurements, to establish the barriers to reversible performance. The influence on preparation and electrode morphology on performance is explored.
Databáze: OpenAIRE
Externí odkaz: