Characterization and electrochemical performance of lithium-active titanium dioxide inlaid LiNi0.5Co0.2Mn0.3O2material prepared by lithium residue-assisted method

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

43 Scopus Citations
View graph of relations

Author(s)

  • Lingjun Li
  • Zhaoyong Chen
  • Liubin Song
  • Ming Xu
  • Huali Zhu
  • Li Gong

Detail(s)

Original languageEnglish
Pages (from-to)77-82
Journal / PublicationJournal of Alloys and Compounds
Volume638
Online published14 Mar 2015
Publication statusPublished - 25 Jul 2015

Abstract

The lithium residues are consumed as raw materials to in-situ synthesize the LiTiO2-inlaid LiNi0.5Co0.2Mn0.3O2composites. The effects of various LiTiO2contents on the morphology, structure, and electrochemical properties of LiNi0.5Co0.2Mn0.3O2materials are investigated in detail. Energy dispersive spectrometer mapping, high-resolution transmission electron microscopy and fast Fourier transform analysis confirm that the spherical particles of LiNi0.5Co0.2Mn0.3O2are completely coated by crystalline LiTiO2phase; X-ray diffraction, cross-section SEM and corresponding EDS results indicate that Ti ions are also doped into the bulk LiNi0.5Co0.2Mn0.3O2with gradient distribution. Electrochemical tests show that the LiTiO2-inlaid samples exhibit excellent reversible capacity, enhanced cyclability, superior lithium diffusion coefficient and rate properties. Specially, the 3 mol% LiTiO2inlaid sample maintains 153.7 mA h g-1with 94.4% capacity retention after 100 cycles between 2.7-4.4 V at 1 C, take 30% advantage than that of the pristine one (118.2 mA h g-1). This improvement can be attributed to the removal of lithium residues and suitable LiTiO2inlaying. The absence of lithium residue is helpful to retard the decomposition of LiPF6. While, suitable LiTiO2inlaying can protect the bulk from directly contacting the electrolyte, buffer the volume change of core and shell during cycles, increase the surface electronic conductivity and offer a 3D path for Li+diffusion from the bulk to interface.

Research Area(s)

  • LiNi0.5Co0.2Mn0.3O2, Lithium residue-assisted method, Lithium-ion battery, LiTiO2-inlaid

Citation Format(s)

Characterization and electrochemical performance of lithium-active titanium dioxide inlaid LiNi0.5Co0.2Mn0.3O2material prepared by lithium residue-assisted method. / Li, Lingjun; Chen, Zhaoyong; Song, Liubin; Xu, Ming; Zhu, Huali; Gong, Li; Zhang, Kaili.

In: Journal of Alloys and Compounds, Vol. 638, 25.07.2015, p. 77-82.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal