Skip to main content
placeholder image

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

Journal Article


Abstract


  • 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.

Authors


  •   Liu, Haiping (external author)
  •   Liang, Gemeng (external author)
  •   Gao, Chao (external author)
  •   Bi, Sifu (external author)
  •   Chen, Qiang (external author)
  •   Xie, Ying (external author)
  •   Fan, Shanshan (external author)
  •   Cao, Lixin (external author)
  •   Pang, Wei Kong.
  •   Guo, Zaiping

Publication Date


  • 2019

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.

Scopus Eid


  • 2-s2.0-85071918042

Start Page


  • 104100-1

End Page


  • 104100-9

Volume


  • 66

Place Of Publication


  • Netherlands

Abstract


  • 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.

Authors


  •   Liu, Haiping (external author)
  •   Liang, Gemeng (external author)
  •   Gao, Chao (external author)
  •   Bi, Sifu (external author)
  •   Chen, Qiang (external author)
  •   Xie, Ying (external author)
  •   Fan, Shanshan (external author)
  •   Cao, Lixin (external author)
  •   Pang, Wei Kong.
  •   Guo, Zaiping

Publication Date


  • 2019

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.

Scopus Eid


  • 2-s2.0-85071918042

Start Page


  • 104100-1

End Page


  • 104100-9

Volume


  • 66

Place Of Publication


  • Netherlands