RESEARCH ARTICLE

Performance and structure of LiNi_0.5Mn_1.5O₄ prepared from various Ni precursors for lithium ion batteries

Zhaoyong Chen^I; Shan Ji^{II, *}; Huali Zhu^I; Sivakumar Pasupathi^II; Ben Bladergroen^II; Vladimir Linkov^II

^IDepartment of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, 410076, People's Republic of China
^IISouth African Institute for Advanced Materials Chemistry, University of the Western Cape, Bellville, 7535 South Africa

ABSTRACT

LiNi_0,5Mn_1,5O₄ compounds were prepared through a solid-state reaction using various Ni precursors. The effect of the precursors on the electrochemical performance of LiNi_0,5Mn_1,5O₄ was investigated. LiNi_0,5Mn_1,5O₄ made from Ni(NO₃)₂ ● 6H₂O shows the best charge-discharge performance. The reversible capacity of LiNi_0,5Mn1_,5O₄ is about 145 mA h g^-1 and remained at 143 mA h g^-1 after 10 cycles at 3.0 to 5.0 V. The XRD results showed that the precursors and dispersion method had significant effects on their structures. Pure spinel phase can be obtained with a high energy ball-milling method and Ni(NO₃)₂●6H₂O as precursor. A trace amount of the NiO phase was detected in LiNi_0,5Mn_1,5O₄ with the manual grinding method when Ni(CH₃COO)₂●6H₂O, NiO and Ni₂O₃ were used as precursors.

Keywords: LiNi_0,5Mn_1,5O₄, spinel, cathode materials, lithium ion battery

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Acknowledgements

Financial assistance from the Department of Science and Technology, South Africa, is gratefully acknowledged.

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Received 21 August 2007
Revised 6 May 2008
Accepted 12 November 2008

* To whom correspondence should be addressed. E-mail: sji@uwc.ac.za