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Additional Research Papers

Self-Substitution and the Temperature Effects on the Electrochemical Performance in the High Voltage Cathode System LiMn1.5+xNi0.5−xO4 (x = 0.1)

[+] Author and Article Information
Yun Xu

Department of Materials Science
and Engineering,
Clemson University,
Clemson, SC 29634
e-mail: yxu4@g.clemson.edu

Mingyang Zhao

Department of Materials Science
and Engineering,
Clemson University,
Clemson, SC 29634
e-mail: mingyaz@g.clemson.edu

Syed Khalid

Photon Science Directorate,
Brookhaven National Laboratory,
Upton, NY 11973
e-mail: Khalid@bnl.gov

Hongmei Luo

Department of Chemical &
Materials Engineering,
New Mexico State University,
Las Cruces, NM 88003
e-mail: hluo@nmsu.edu

Kyle S. Brinkman

Department of Materials Science
and Engineering,
Clemson University,
Clemson, SC 29634
e-mail: ksbrink@clemson.edu

1Corresponding author.

Manuscript received January 13, 2017; final manuscript received February 24, 2017; published online May 9, 2017. Assoc. Editor: Kevin Huang.

J. Electrochem. En. Conv. Stor. 14(2), 021003 (May 09, 2017) (4 pages) Paper No: JEECS-17-1008; doi: 10.1115/1.4036386 History: Received January 13, 2017; Revised February 24, 2017

The high voltage cathode material, LiMn1.6Ni0.4O4, was prepared by a polymer-assisted method. The novelty of this work is the substitution of Ni with Mn, which already exists in the crystal structure instead of other isovalent metal ion dopants which would result in capacity loss. The electrochemical performance testing including stability and rate capability was evaluated. The temperature was found to impose a change on the valence and structure of the cathode materials. Specifically, manganese tends to be reduced at a high temperature of 800 °C and leads to structural changes. The manganese substituted LiMn1.5Ni0.5O4 (LMN) has proved to be a good candidate material for Li-ion battery cathodes displaying good rate capability and capacity retention. The cathode materials processed at 550 °C showed a stable performance with negligible capacity loss for 400 cycles.

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References

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Figures

Grahic Jump Location
Fig. 1

(a) XRD patterns of LMN(550) and LMN(800) and (b) SEM image of synthesized particles LMN(550) sample

Grahic Jump Location
Fig. 2

(a) Cyclic voltammograms of LMN(550) and LMN(800) scanned from 3.5 V to 5 V and (b) XANES of LMN(550), LMN(800), and Mn foil

Grahic Jump Location
Fig. 3

(a) Charge and discharge profile from 1.75 V to 5 V and (b) cycle performance of LMN(550) and LMN(800) at 4 C

Grahic Jump Location
Fig. 4

(a) Impedance spectra and the fitting result of two LMN prepared at different temperatures, inset is the equivalent circuit used to fit impedance spectra. With fitting parameters listed in the bottom table. (b) Charge and discharge profiles of full cell and half-cell.

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