Interfacial-engineering-enabled high-performance Li-rich cathodes

doi:10.1016/j.cej.2024.149546

Interfacial-engineering-enabled high-performance Li-rich cathodes

2024-04-01

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DOI：10.1016/j.cej.2024.149546

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Li-rich layered oxides (LLOs) with high energy density and low cost are regarded as the most promising cathode materials for the next generation Li -ion batteries (LIBs). However, the rapid capacity decline and voltage fading impede their practical application. Herein, an OVs(oxygen vacancies)-spinel functional layer with rich-OVs and surface spinel phase is constructed on the surface of Li1.2Mn0.56Ni0.16Co0.08O2 (LLMO) through Y2O3 and ZrO2 comodification. The interface OVs effectively stabilize lattice oxygen evolution and suppress structural distortion by storing O2 or O(2 -n)- released from LLMO within these OVs, while the formation of spinel phase in the subsurface motivates rapid Li+ transfer. The comprehensive effect of this OVs-spinel layer synergistically inhibits irreversible oxygen release, mitigates electrolyte decomposition, and accelerates Li+ ions diffusion kinetics. The corresponding cathode with Y2O3 and ZrO2 co-modification (Y&Zr-LLMO) exhibits an average attenuation voltage of 2.5 mV per cycle (vs. 3.3 mV), and a capacity retention rate of 95.4 % after 100 cycles at 1C (vs. 86.5 %). Remarkably, the pouch cell (Y&Zr-LLMO/graphite) also demonstrates excellent cycling stability, retaining 71.4 % capacity after 600 cycles at 0.5C. This finding pioneers multifunctional interface layer designs for high energy density LIBs.

Keywords:

Li-rich layered oxides

Oxygen vacancies

OVs-spinel layer

Voltage fading

Cycling stability

Interfacial-engineering-enabled high-performance Li-rich cathodes

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