Compositionally complex doping for zero-strain zero-cobalt layered cathodes
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 67-73 |
Journal / Publication | Nature |
Volume | 610 |
Issue number | 7930 |
Online published | 21 Sept 2022 |
Publication status | Published - 6 Oct 2022 |
Externally published | Yes |
Link(s)
Abstract
The high volatility of the price of cobalt and the geopolitical limitations of cobalt mining have made the elimination of Co a pressing need for the automotive industry1. Owing to their high energy density and low-cost advantages, high-Ni and low-Co or Co-free (zero-Co) layered cathodes have become the most promising cathodes for next-generation lithium-ion batteries2,3. However, current high-Ni cathode materials, without exception, suffer severely from their intrinsic thermal and chemo-mechanical instabilities and insufficient cycle life. Here, by using a new compositionally complex (high-entropy) doping strategy, we successfully fabricate a high-Ni, zero-Co layered cathode that has extremely high thermal and cycling stability. Combining X-ray diffraction, transmission electron microscopy and nanotomography, we find that the cathode exhibits nearly zero volumetric change over a wide electrochemical window, resulting in greatly reduced lattice defects and local strain-induced cracks. In-situ heating experiments reveal that the thermal stability of the new cathode is significantly improved, reaching the level of the ultra-stable NMC-532. Owing to the considerably increased thermal stability and the zero volumetric change, it exhibits greatly improved capacity retention. This work, by resolving the long-standing safety and stability concerns for high-Ni, zero-Co cathode materials, offers a commercially viable cathode for safe, long-life lithium-ion batteries and a universal strategy for suppressing strain and phase transformation in intercalation electrodes.
Research Area(s)
Citation Format(s)
Compositionally complex doping for zero-strain zero-cobalt layered cathodes. / Zhang, Rui; Wang, Chunyang; Zou, Peichao et al.
In: Nature, Vol. 610, No. 7930, 06.10.2022, p. 67-73.
In: Nature, Vol. 610, No. 7930, 06.10.2022, p. 67-73.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review