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Electrochemical Characteristics of Co-Substituted α- and β-Li(5)AlO(4) as High-Specific Capacity Positive Electrode Materials
[Image: see text] Electric vehicles and hybrid electric vehicles require batteries with higher energy densities than conventional batteries. Anion redox-type active materials have been proposed as new high-capacity positive electrode materials for Li-ion batteries with high-energy densities. Co-subs...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7364745/ https://www.ncbi.nlm.nih.gov/pubmed/32685860 http://dx.doi.org/10.1021/acsomega.0c02111 |
Sumario: | [Image: see text] Electric vehicles and hybrid electric vehicles require batteries with higher energy densities than conventional batteries. Anion redox-type active materials have been proposed as new high-capacity positive electrode materials for Li-ion batteries with high-energy densities. Co-substituted Li(5)AlO(4) is a novel and promising high-capacity positive electrode material for Li-ion batteries. In this study, we investigated the influence of different synthesis conditions on the enhancement of the specific capacity. The material prepared via mechanical alloying of β-Li(5)AlO(4) with LiCoO(2) at 300 rpm for 24 h exhibited a higher specific capacity than that prepared from α-Li(5)AlO(4) and LiCoO(2). Co-substituted β-Li(5)AlO(4) demonstrated a specific capacity of approximately 250 mA h g(–1). The specific capacity of Co-substituted α and β-Li(5)AlO(4) increased with increasing Co content in the samples. According to X-ray absorption near edge structure measurements, the irreversible oxygen redox reaction and a reversible reaction involving the formation and consumption of peroxide were responsible for the charge compensation of Co-substituted β-Li(5)AlO(4) and α-Li(5)AlO(4), respectively. |
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