Publication date: 10th April 2024
For the past decades, extensive efforts have been placed in improving the performance of the layered compounds for cathodes such as by compositional tuning and structural modifications. One of the notable approaches in recent years is to adopt excess amounts of lithium-ions in the layered materials, which surprisingly revealed that the specific capacity can be boosted in the layered cathodes via the shift from the conventional cationic redox reaction relying on transition metals (Co, Ni and Mn) to the cumulative cationic and anionic (oxygen) redox reaction. In this journey to explore the ‘lithium-excess layered cathodes’, various new findings have been being disclosed. In this talk, I will present our recent understandings on these materials with respect to the lithium insertion mechanism that differs from what have been observed in conventional layered materials and the effect of the layered stacking sequences. We report a novel series of lithium-rich layered oxides (LRLO) with O2-type oxygen stacking, which effectively address the persistent challenges associated with the voltage and structural deterioration observed in conventional LRLO cathodes. Our newly developed LRLO cathodes exhibit minimal structural disordering even with the anionic redox participation as much as ~ 90 % (based on the nominal composition corresponding to ~ 250 mAh g-1), while maintaining a stable discharge voltage.
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