Constructing “Li-rich Ni-rich” oxide cathodes for high-energy-density Li-ion batteries
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Date
2023-01-26
Journal Title
Journal ISSN
Volume Title
Publisher
Royal Society of Chemistry
Abstract
The current exploration of high-energy-density cathode materials for Li-ion batteries is mainly concentrated on either so-called “Li-rich” or “Ni-rich” oxides. However, both are suffering from formidable practical challenges. Here, we combine these two concepts to obtain “Li-rich Ni-rich” oxides in pursuit of more practical high-energy-density cathodes. As a proof of concept, we synthesized an array of Li1+yNi(3−5y)/3Mo2y/3O2 oxides, whose structures were identified to be the coexistence of LiNiO2-rich and Li4MoO5-rich domains with the aid of XRD, TEM, and NMR techniques. Such an intergrowth structure of 5–20 nm size enables excellent mechanical and structural reversibility for the layered rock-salt LiNiO2-rich domain upon cycling thanks to the robust cubic rock-salt Li4MoO5-rich domain enabling an “epitaxial stabilization” effect. As a result, we achieved high capacities (>220 mA h g−1) with Ni contents as low as 80%; the Li1.09Ni0.85Mo0.06O2 member (y = 0.09) shows much improved cycling performances (91% capacity retention for 100 cycles at C/10) compared with pure LiNiO2. This work validates the feasibility of constructing Li-rich Ni-rich compounds in the form of intergrowing domains and hence unlocks vast possibilities for future cathode design.
© The Royal Society of Chemistry
Description
Keywords
Electric batteries, Lithium, Cathodes, Nickel, Construction, High energy physics, Oxides
Citation
Li, B., Rousse, G., Zhang, L., Avdeev, M., Deschamps, M., Abakumov, A. M., & Tarascon, J.-M. (2023). Constructing “Li-rich Ni-rich” oxide cathodes for high-energy-density Li-ion batteries. Energy & Environmental Science, 16(3), 1210-1222. doi:10.1039/D2EE03969A