Journal
ENERGY STORAGE MATERIALS
Volume 51, Issue -, Pages 11-18Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2022.06.022
Keywords
Lithium ion batteries; Nickel; copper oxides electrodes; Ex; in situ electron microscopy; Lithium pathways; Reaction kinetics
Funding
- Research Grant Council of Hong Kong [C5029-18E]
- Hong Kong Polytechnic University (ZVRP)
- Research Foundation for Distinguished Scholars of Qingdao Agricultural University [665-1119008]
- National Natural Science Foundation of China [12172143]
- Opening Fund of Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education [2020JYBKF04]
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In this study, NiO@CuO core-shell nanocomposites were prepared and used as anodes for lithium-ion batteries. By using a combination of in situ and ex situ electron microscopy, the researchers identified a two-stage lithiation reaction pathway on NiO@CuO and revealed the key role of the core-shell structure in high cycling stability.
Nanostructured composite electrodes with multiple active phases offer extraordinary performance that can be harnessed in future batteries. However, it is difficult to disclose the complicated reaction pathways. In this work, NiO@CuO core-shell nanocomposites are prepared and used as anodes for lithium-ion batteries, with superior rate and stability performance compared with single-phase CuO and NiO. Using a combination of in situ and ex situ electron microscopy, a two-stage lithiation reaction pathway on NiO@CuO is identified, with CuO reduced to Cu2O first and followed by the simultaneous reduction of both Cu2O and NiO to metals, resolving the existing inconsistency in literature. Chemomechanical simulation further discloses the key role of the core-shell structure in high cycling stability of NiO@CuO, which decreases the probability of cracking during the discharge-charge process. This work provides new insights to explore lithiation mechanisms and kinetics in novel electrodes, which contribute to further development of various electrode materials.
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