Skip to main content
placeholder image

Suppressed capacity/voltage fading of high-capacity lithium-rich layered materials via the design of heterogeneous distribution in the composition

Journal Article


Abstract


  • Lithium-rich layered materials, Li1+xM1-xO 2 (M = Mn, Ni, Co), have been under intense investigation as high-performance cathode materials for lithium ion batteries due to their high discharge capacity, low cost and environmental benignity. Unfortunately, the practical uses of these oxides have so far been hindered by their severe capacity and voltage fading during high voltage cycling (>4.5 V vs. Li/Li+). In an attempt to overcome these problems, herein, a novel lithium-rich Li1.14[Mn0.60Ni0.25Co 0.15]0.86O2 microsphere with heterogeneous distribution in the composition has been reasonably designed and successfully synthesized via a co-precipitation method. The chemical composition in the spherical particle is gradually altered by increasing the Mn concentration while reducing the Co content from the particle center to the outer layer. At the same time, the Ni content remains almost constant throughout the particle. The coin cell with the heterogeneous cathode material delivers a high discharge capacity of over 230 mA h g-1 between 2.0 V and 4.6 V, and shows excellent cyclic stability due to the continuous increase of the stable tetravalent Mn towards the outer surface of the spherical particles, corresponding to 93.8% capacity retention after 200 cycles at 0.5 C. More importantly, the as-prepared material exhibits a significantly lower discharge voltage decay compared with conventional materials, which may mainly be ascribed to the suppression of the layered-to-spinel transformation in the Co-rich/Mn-depleted regions of the spherical particle. The capacity and voltage fading of the lithium-rich layered material are simultaneously suppressed by the special architecturual design, and the results here will shed light on developing cathode materials with special structures and superior electrochemical properties for high-performance lithium ion batteries. �� 2014 The Royal Society of Chemistry.

UOW Authors


  •   Guo, Haipeng (external author)

Publication Date


  • 2014

Citation


  • Yang, X., Wang, D., Yu, R., Bai, Y., Shu, H., Ge, L., . . . Wang, X. (2014). Suppressed capacity/voltage fading of high-capacity lithium-rich layered materials via the design of heterogeneous distribution in the composition. Journal of Materials Chemistry A, 2(11), 3899-3911. doi:10.1039/c3ta14513a

Scopus Eid


  • 2-s2.0-84894439094

Web Of Science Accession Number


Start Page


  • 3899

End Page


  • 3911

Volume


  • 2

Issue


  • 11

Place Of Publication


Abstract


  • Lithium-rich layered materials, Li1+xM1-xO 2 (M = Mn, Ni, Co), have been under intense investigation as high-performance cathode materials for lithium ion batteries due to their high discharge capacity, low cost and environmental benignity. Unfortunately, the practical uses of these oxides have so far been hindered by their severe capacity and voltage fading during high voltage cycling (>4.5 V vs. Li/Li+). In an attempt to overcome these problems, herein, a novel lithium-rich Li1.14[Mn0.60Ni0.25Co 0.15]0.86O2 microsphere with heterogeneous distribution in the composition has been reasonably designed and successfully synthesized via a co-precipitation method. The chemical composition in the spherical particle is gradually altered by increasing the Mn concentration while reducing the Co content from the particle center to the outer layer. At the same time, the Ni content remains almost constant throughout the particle. The coin cell with the heterogeneous cathode material delivers a high discharge capacity of over 230 mA h g-1 between 2.0 V and 4.6 V, and shows excellent cyclic stability due to the continuous increase of the stable tetravalent Mn towards the outer surface of the spherical particles, corresponding to 93.8% capacity retention after 200 cycles at 0.5 C. More importantly, the as-prepared material exhibits a significantly lower discharge voltage decay compared with conventional materials, which may mainly be ascribed to the suppression of the layered-to-spinel transformation in the Co-rich/Mn-depleted regions of the spherical particle. The capacity and voltage fading of the lithium-rich layered material are simultaneously suppressed by the special architecturual design, and the results here will shed light on developing cathode materials with special structures and superior electrochemical properties for high-performance lithium ion batteries. �� 2014 The Royal Society of Chemistry.

UOW Authors


  •   Guo, Haipeng (external author)

Publication Date


  • 2014

Citation


  • Yang, X., Wang, D., Yu, R., Bai, Y., Shu, H., Ge, L., . . . Wang, X. (2014). Suppressed capacity/voltage fading of high-capacity lithium-rich layered materials via the design of heterogeneous distribution in the composition. Journal of Materials Chemistry A, 2(11), 3899-3911. doi:10.1039/c3ta14513a

Scopus Eid


  • 2-s2.0-84894439094

Web Of Science Accession Number


Start Page


  • 3899

End Page


  • 3911

Volume


  • 2

Issue


  • 11

Place Of Publication