Comparison of the electrochemical performance of p-Cu₂O and n-Cu₂O anode materials synthesized by electrodeposition technique for rechargeable lithium-ion batteries
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Date
2024-11-01
Authors
Fernando, W. T. R. S.
Amaraweera, T. H. N. G.
Wijesundera, R. P.
Wijayasinghe, H. W. M. A. C.
Journal Title
Journal ISSN
Volume Title
Publisher
Postgraduate Institute of Science (PGIS), University of Peradeniya, Peradeniya ,Sri Lanka
Abstract
Cu₂O has gained attention for the anode application of the rechargeable Lithium-Ion Battery (LIB) than the other competing materials due to its high theoretical capacity (375.0 mAh/g), good capacity retention, affordability, non-toxicity and ease of storage. The crystallinity, morphology and interfacial properties between the current collector/anode and anode/electrolyte are crucial for the electrochemical performance of Cu₂O electrodes. The aforementioned properties can be optimized by the synthesis method. A simple, low-cost, and convenient electrodeposition technique, which is a promising technique that enhances crystallinity with favourable morphology and interfacial properties for electrode materials, has not been studied. This study aimed to investigate the possibility of using p-Cu₂O and n-Cu₂O anode materials for LIBs synthesized by the electrodeposition technique. The favourable morphology of synthesized p-Cu₂O and n-Cu₂O enhanced the contact area of the active materials with the electrolyte, facilitating Li ion diffusion. Mott-Schottky plots confirmed the formation of p-type and n-type conductivity in Cu₂O with dopant densities of 2.0685 × 1017 cm⁻³ and 2.9692× 1017 cm⁻³, respectively. The electron densities are more crucial for the conversion mechanism reaction during the charging and discharging process. Therefore, n-Cu₂O attributes better conversion mechanism reactions than p-Cu₂O. Current-voltage characterizations of p-Cu₂O and n-Cu₂O electrodes confirmed the Ohmic contact in between the anode and current collector. The p-Cu₂O and n-Cu₂O electrodes exhibited a high initial specific discharge capacities of 533.0 mAh/g and 623.9 mAh/g at a rate of C/5, respectively. The electrodes showed a specific discharge capacities of 143.2 mAh/g and 203.4 mAh/g with Coulombic efficiencies of 99.9% and 98.7% after 50 cycles for p-Cu₂O and n-Cu₂O, respectively. Altogether, this study revealed that n-Cu2O has better electrochemical performance than p-Cu₂O. Hence, n-Cu₂O has a potential for the anode application in next-generation high-performance LIBs.
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Keywords
Anode materials , Electrodeposition , Li-ion battery , n-Cu2O , p-Cu2O
Citation
Proceedings of the Postgraduate Institute of Science Research Congress (RESCON) - 2024, University of Peradeniya, P 186