Changes in the structure and physical properties of the solid solution LiNi1-xMnxO2 with variation its composition

Hironori Kobayashi, Hikari Sakaebe, Hiroyuki Kageyama, Kuniaki Tatsumi, Yoshinori Arachi, Takashi Kamiyama

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The layered oxides LiNi1-xMnxO2 (x= 0.1-0.5) were synthesized and characterized using synchrotron X-ray diffraction, TOF neutron diffraction, SQUID magnetometry, ICP spectroscopy, XAFS, and electrochemical measurements. All the samples were single-phase and adopted the α-NaFeO2 structure; LiNi1-xMnxO2 can be represented as Li(Ni2+xNi3+1-2xMn4+ x)O2. Structural analysis using synchrotron and neutron diffraction data demonstrated that the lattice parameters of LiNi0.5Mn0.5O2 are a = 2.892 Å and c = 14.302 Å and that the chemical composition can be expressed by referring to the Wyckoff positions 3a and 3b as [Li0.91Ni0.09]3a[Li0.09Mn 0.5Ni0.41]3bO2. The lattice parameters a and c and the fraction of Ni at the 3a site of LiNi1-xMnxO2 increased with Mn content up to the x = 0.4 composition and then showed little change between x = 0.4 and 0.5. An increase in the Ni-O distance was observed with increasing x. The appearance of ferromagnetism was clearly observed at x = 0.4-0.5 as the Ni2+ and Mn4+ content increased. The discharge capacity of the Li/LiNi1-xMnxO2 cell decreased from 190 mAh g-1 (x = 0.1) to 140 mAh g-1 (x = 0.5).

Original languageEnglish
Pages (from-to)590-595
Number of pages6
JournalJournal of Materials Chemistry
Issue number3
Publication statusPublished - Mar 1 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry


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