Journal
NANO ENERGY
Volume 100, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107439
Keywords
Co gradient strategy; Li-rich cathode; Lithium-ion batteries; in situ XRD; Atomic resolution characterization
Categories
Funding
- National Natural Science Foundation of China [52072282]
- Shenzhen Fundamental Research Program [JCYJ20190809114409397]
- Fundamental Research Funds for the Central Universities [WUT: 2021III016GX]
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Lithium-rich layered oxides (LLOs) are potential cathode materials for next generation energy storage devices. However, their structural degradation and capacity decay have hindered their applications. This study finds that cobalt can effectively mitigate structural degradation and improve cycling stability through surface reconstruction method.
Lithium-rich layered oxides (LLOs) are one of the promising cathode materials for next generation energy storage devices, but structural degradation and severe capacity decay during cycling have hindered applications. Here, we find cobalt effectively mitigate structural degradation and develop a simple and novel metal organic framework (MOF) treatment and surface reconstruction method to fabricate Co gradient layer on LLOs. In situ and ex situ microstructural studies show the capacity decay is mainly originated from the formation of microstructural defects such as voids and pores, continuous oxygen release and formation of spinel and rock-salt structure initiated from the surface. The reconstruction leads to the formation of an artificial layer of Co rich and Li poor spinel (Co3O4) and rock-salt (CoO) structure on surface, suppressing the diffusion of cations and O-1/O-2 anions toward the surface during cycling. The LLO-Co cathode exhibits enhanced cycling stability with a capacity retention of 94.4% at 0.2 C after 100 cycles and a high capacity of 183 mAh g(-1) at 1 C, in comparison with those of untreated LLO (80.5% and 153 mAh g(-1)). This work sheds lights on better utilize rare Co resource in the development of high capacity and cyclability cathode materials for lithium-ion batteries.
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