Compositionally Complex Doping for Zero-Strain Zero-Cobalt Layered Cathodes

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Title of the Paper: Compositionally complex doping for zero-strain zero-cobalt layered cathodes

First Author: Zhang Rui (University of California, Irvine)

Co-First Author: Wang Chunyang (University of California, Irvine)

Corresponding Author: Xin Huolin (University of California, Irvine)

Highlights of the article

In recent years, lithium-ion batteries have been widely used in various electronic devices. However, as their usage expands in different fields, there are higher demands for high-energy cathode materials. Cobalt (Co) is a critical component for stable cathodes and has been widely incorporated into current high-nickel systems to suppress Li/Ni cation mixing and improve thermal stability. However, the high price fluctuations of cobalt and geopolitical limitations in mining have made the elimination of cobalt an urgent need for the automotive industry.

Based on this, Xin Huolin's team at the University of California, Irvine, has achieved, for the first time, intrinsic "zero-strain" cathode materials in a high-nickel and cobalt-free system. The team not only suppressed the volume change of high-nickel materials to within 0.5% but also achieved thermal stability comparable to NMC-532 materials. Additionally, the team creatively proposed the universal "high-entropy doping" effect, clarifying that this "zero-strain" behavior originates from the unique "high-entropy doping" effect, which suppresses deoxygenation, dislocation formation, and detrimental phase transitions. This work was published in the top-tier international journal, Nature, with Zhang Rui and Wang Chunyang as co-first authors.

Product citation

It is worth noting that the electrochemical performance of a series of batteries shown in Figure 1c, 2f, and 3a-3e in this article was tested using the NEWARE BTS-4000 battery test system. The NEWARE BTS-4000 is a comprehensive and highly accurate battery testing system, making it the preferred choice for battery testing.

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Original article information

Zhang, R., Wang, C., Zou, P. et al. Compositionally complex doping for zero-strain zero-cobalt layered cathodes. Nature 610, 67–73 (2022).

https://www.nature.com/articles/s41586-022-05115-z

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