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Insight into the improved cycling stability of sphere-nanorod-like micro-nanostructured high voltage spinel cathode for lithium-ion batteries

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posted on 2024-11-16, 04:03 authored by Haiping Liu, Gemeng Liang, Chao Gao, Sifu Bi, Qiang Chen, Ying Xie, Shanshan Fan, Lixin Cao, Wei Kong PangWei Kong Pang, Zaiping GuoZaiping Guo
Currently, developing cathode material with high energy density and good cycling performance is one of the key challenges for lithium-ion batteries. LiNi0.5-xMn1.5+xO4 (LNMO) spinel cathode has attracted great attention as the most promising cathode candidate due to its extraordinarily high operating voltage, but its inferior long-term cycling stability has limited its further development. In this work, we successfully designed LNMOs with specific facets and different morphologies, among which the hybrid sphere-nanorod-like micro-nanostructured LNMO possesses excellent cycling performance, with capacity of over 107.8 mAh g−1 after 1000 cycles at 10 C and superior rate capability up to 10 C. Its superior rate capability is found to originate from the large Li-O bond length by Rietveld refinement, which contributes to decreased charge transfer resistance and ease of Li insertion/extraction at tetrahedral sites. On the other hand, the excellent cycling stability comes from its having the least structural deformation from mechanistic reactions, which involve the longest solid-solution reaction, the highest spinel structural tolerance/stability up to Δ = ~0.69 Li, and a highly reversible two-phase reaction during charge and discharge in the hybrid LNMO, as revealed by the in operando synchrotron X-ray powder diffraction results. Moreover, the hybrid LNMO exhibits surface planes (210) with the highest Mn defect formation energy, prohibiting Mn3+ disproportionation and further stabilizing its cycling stability. This work not only demonstrates the importance of crystallographic and morphological controls on the high-voltage spinel performance, but also opens a window for battery engineers and researchers to develop battery technology for high-power applications.

Funding

Exploration of Advanced Nanostructures for Sodium-ion Battery Application

Australian Research Council

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High-voltage electrode materials for lithium-ion batteries

Australian Research Council

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Citation

Liu, H., Liang, G., Gao, C., Bi, S., Chen, Q., Xie, Y., Fan, S., Cao, L., Pang, W. & Guo, Z. (2019). Insight into the improved cycling stability of sphere-nanorod-like micro-nanostructured high voltage spinel cathode for lithium-ion batteries. Nano Energy, 66 104100-1-104100-9.

Journal title

Nano Energy

Volume

66

Language

English

RIS ID

138653

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