Zr-doped Li[Ni0.5-xMn0.5-xZr2x]O 2 (x = 0, 0.025) as cathode material for lithium ion batteries

Kyung Hee Jeong, Hyung Wook Ha, Nan Ji Yun, Ming Zi Hong, Keon Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Layered Li[Ni0.5-xMn0.5-xZr2x]O 2 (x = 0, 0.025) have been prepared by the mixed hydroxide and molten-salt synthesis method. The individual particles of synthesized materials have a sub-microsize range of 200-500 nm, and LiNi0.475Mn 0.475Zr0.05O2 has a rougher surface than that of LiNi0.5Mn0.5O2. The Li/Li[Ni 0.5-xMn0.5-xZr2x]O2 (x = 0, 0.025) electrodes were cycled between 4.5 and 2.0 V at a current density of 15 mA/g, the discharge capacity of both cells increased during the first ten cycles. The discharge capacity of the Li/LiNi0.475Mn0.475Zr 0.05O2 cell increased from 150 to 220 mAh/g, which is 50 mAh/g larger than that of the Li/LiNi0.5Mn0.5O2 cell. We found that the oxidation of oxygen and the Mn3+ ion concerned this phenomenon from the cyclic voltammetry (CV). Thermal stability of the charged Li[Ni0.5-xMn0.5-xZr2x]O 2 (x = 0, 0.025) cathode was improved by Zr doping.

Original languageEnglish
Pages (from-to)5349-5353
Number of pages5
JournalElectrochimica Acta
Volume50
Issue number27
DOIs
Publication statusPublished - 2005 Sep 20

Keywords

  • Cathode material
  • LiNiMn O
  • Lithium ion batteries
  • Zr-doping

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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