Hauptseite > Publikationsdatenbank > A highly stabilized Ni-rich NCA cathode for high-energy lithium-ion batteries > print

001     878034
005     20240708132714.0
024 7 _ |a 10.1016/j.mattod.2020.01.019
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100 1 _ |a Ryu, Hoon-Hee
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245 _ _ |a A highly stabilized Ni-rich NCA cathode for high-energy lithium-ion batteries
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a In this study, we have demonstrated that boron doping of Ni-rich Li[NixCoyAl1−x−y]O2 dramatically alters the microstructure of the material. Li[Ni0.885Co0.1Al0.015]O2 is composed of large equiaxed primary particles, whereas a boron-doped Li[Ni0.878Co0.097Al0.015B0.01]O2 cathode consists of elongated particles that are highly oriented to produce a strong, crystallographic texture. Boron reduces the surface energy of the (0 0 3) planes, resulting in a preferential growth mode that maximizes the (0 0 3) facet. This microstructure modification greatly improves the cycling stability; the Li[Ni0.878Co0.097Al0.015B0.01]O2 cathode maintains a remarkable 83% of the initial capacity after 1000 cycles even when it is cycled at 100% depth of discharge. By contrast, the Li[Ni0.885Co0.1Al0.015]O2 cathode retains only 49% of its initial capacity. The superior cycling stability clearly indicates the importance of the particle microstructure (i.e., particle size, particle shape, and crystallographic orientation) in mitigating the abrupt internal strain caused by phase transitions in the deeply charged state, which occurs in all Ni-rich layered cathodes. Microstructure engineering by surface energy modification, when combined with protective coatings and composition modification, may provide a long-sought method of harnessing the high capacity of Ni-rich layered cathodes without sacrificing the cycling stability.
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700 1 _ |a Park, Nam-Yung
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700 1 _ |a Seo, Jeong Hyun
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700 1 _ |a Yu, Young-Sang
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700 1 _ |a Sharma, Monika
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700 1 _ |a Mücke, Robert
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700 1 _ |a Kaghazchi, Payam
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700 1 _ |a Yoon, Chong S.
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700 1 _ |a Sun, Yang-Kook
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773 _ _ |a 10.1016/j.mattod.2020.01.019
|g Vol. 36, p. 73 - 82
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856 4 _ |y Published on 2020-02-22. Available in OpenAccess from 2022-02-22.
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856 4 _ |y Published on 2020-02-22. Available in OpenAccess from 2022-02-22.
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