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Compositionally complex doping for zero-strain zero-cobalt layered cathodes
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DOI：10.1038/s41586-022-05115-z.png)
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Abstract
En 中文
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 industry(1). 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 batteries(2)(,3). However, current high-Ni cathode materials, without exception, suffer severely from their intrinsicthermal 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 ofthe 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.
Keywords:
LITHIUM-ION BATTERIES
OXIDE CATHODES
NI-RICH
THERMAL-STABILITY
GENERATION
CHEMISTRY
MECHANISM
DEPTH
Journal
IF:
48.5
Papers:
1.8W
Citations:
96.5W
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