Novel core-shell-structured Li[(Ni0.8Co0.2)(0.8)(Ni0.5Mn0.5)(0.2)]O-2 via coprecipitation as positive electrode material for lithium secondary batteries
- Authors
- Sun, Yang-Kook; Myung, Seung-Taek; Shin, Ho-Suk; Bae, Young Chan; Yoon, Chong Seung
- Issue Date
- May-2006
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY B, v.110, no.13, pp.6810 - 6815
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY B
- Volume
- 110
- Number
- 13
- Start Page
- 6810
- End Page
- 6815
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181489
- DOI
- 10.1021/jp0571473
- ISSN
- 1520-6106
- Abstract
- We have successfully synthesized a spherical core-shell structure based on Li[(Ni0.8Co0.2)(0.8)(Ni0.5Mn0.5)(0.2)]-O-2 via a coprecipitation route. According to the careful examination by scanning electron microscopy (SEM), transmission electron microscopy energy-dispersive spectroscopy (TEM-EDS), and X-ray diffraction (XRD), it was found that the core-shell particle consisted of Li[Ni0.8Co0.2]O-2 as the core and Li[Ni0.5Mn0.5]O-2 as the shell, of which the thickness was estimated to be 1 to similar to 1.5 mu m. Both the core and shell were dense as confirmed by SEM. Though the core-shell-structured Li[(Ni0.8Co0.2)(0.8)(Ni0.5Mn0.5)(0.2)]O-2 delivered a slightly reduced initial discharge capacity, the capacity retention and thermal stability were significantly improved relative to those of the Li[Ni0.8Co0.2]O-2 electrode without the Li[Ni0.5Mn0.5]O-2 shell. The carbon/Li[Ni0.8Co0.2]O-2 pouch cell underwent an explosive ignition during the nail penetration test, whereas the carbon/Li-[(Ni0.8Co0.2)(0.8)(Ni0.5Mn0.5)(0.2)]O-2 cell remained stable, demonstrating the superior thermal stability of the core-shell electrode. As a new positive electrode material, the core-shell-structured Li[(Ni0.8Co0.2)(0.8)(Ni0.5Mn0.5)(0.2)]O-2 is a significant breakthrough in the development of high-capacity lithium secondary batteries.
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