Studies on Structural Change of LiNi0.5Mn0.5O 2 Cathode for Li-ion Secondary Batteries using Synchrotron Radiation

Yoshinori Arachi, Minoru Tanaka, Takeshi Asai, Hironori Kobayashi, Hikari Sakaebe, Hiroyuki Kageyama, Syuichi Emura, Yoshiyuki Nakata

Research output: Contribution to journalArticlepeer-review

Abstract

The cell performance of Li1-xNi0.5Mn 0.5O2 using Li exhibited a specific capacity of c.a. 150 mAh/g in the voltage range of 2.5 to 4.3 V. XRD and XAFS measurements using synchrotron radiation were carried out to observe the average and the local structural changes during a charging process. As the cell charged, Ni K-edge of XANES spectra showed the chemical shift towards higher energy in the voltage range of 2.5-4.1 V and then no remarkable shift up to 4.3 V. It was found that nickel of x=0 in Li1-xNi0.5Mn0.5O2 was located in divalent and manganese in tetravalent at the octahedral site. Lithium was removed by the oxidation of Ni, resulting in the ordering of cations in the layer; that is, appearance of the monoclinic phase at x=0.5.

Original languageEnglish
Pages (from-to)1089-1092
Number of pages4
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume50
Issue number12
DOIs
Publication statusPublished - Dec 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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