In:
Energy & Environmental Science, Royal Society of Chemistry (RSC), Vol. 14, No. 9 ( 2021), p. 5084-5095
Kurzfassung:
The recharging capability of Ni-rich layered cathodes deteriorates rapidly upon cycling, mainly from mechanical instability caused by removing a large amount of Li ions from the host structure. Through multi-stage microstructural tailoring, which refers to optimal engineering of the precursor microstructure and then deliberately over-doping of Al during the lithiation stage to preserve the needle-like morphology of the precursor, we optimize the primary particle morphology of the cathode. It is demonstrated that the chemical and microstructural engineering of a Li[Ni 0.9– x Co 0.1 Al x ]O 2 cathode starting from its precursor stage produces a unique structure that relieves the detrimental mechanical strain and significantly extends the battery life. Excess Al-doped Li[Ni 0.86 Co 0.1 Al 0.04 ]O 2 with the compositional partitioning of Ni produces a highly aligned microstructure in which constituent primary particles are refined to a sub-micrometer scale. Thus, the designed Li[Ni 0.86 Co 0.1 Al 0.04 ]O 2 retains 86.5% of the initial capacity after 2000 cycles and an unprecedented 78.0% even at a severe operation condition of 45 °C. The proposed Li[Ni 0.86 Co 0.1 Al 0.04 ]O 2 represents a new class of Ni-rich Li[Ni x Co y Al 1– x – y ]O 2 cathodes that can meet the energy density required for next-generation electric vehicles, without compromising the battery life and safety.
Materialart:
Online-Ressource
ISSN:
1754-5692
,
1754-5706
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2021
ZDB Id:
2439879-2
