Issue 18, 2013

Precise preparation of high performance spherical hierarchical LiNi0.5Mn1.5O4 for 5 V lithium ion secondary batteries

Abstract

This work developed a novel ammonium oxalate–carbonate composite co-precipitation method to prepare spinel LiNi0.5Mn1.5O4. By this method combined with a facile hydrothermal treatment and particular cooling process, an ideal spinel with precise stoichiometric Ni/Mn and classic Fd3m structure is obtained, and furthermore, the Mn3+ content can be strictly limited. Additionally, the prepared LiNi0.5Mn1.5O4 has a spherical hierarchical morphology, composed of nano or submicron primary particles. This LiNi0.5Mn1.5O4 shows superlative electrochemical performance. It delivers a discharge capacity of 141.2 mA h g−1, and importantly 98.2% of which discharges at 4.7 V. After 200 cycles at 0.3 C, 1 C and 3 C, the capacity retentions are 96.3%, 94.4% and 91.1%, respectively. Chemical and electrochemical measurements indicate that the elimination of the majority of Mn3+ in the obtained LiNi0.5Mn1.5O4 results in the high capacity proportion at 4.7 V. Additionally, the retained Fd3m structure and spherical hierarchical morphology also effectively favour the cycling and rate performances.

Graphical abstract: Precise preparation of high performance spherical hierarchical LiNi0.5Mn1.5O4 for 5 V lithium ion secondary batteries

Supplementary files

Article information

Article type
Communication
Submitted
08 Mar 2013
Accepted
22 Mar 2013
First published
25 Mar 2013

J. Mater. Chem. A, 2013,1, 5492-5496

Precise preparation of high performance spherical hierarchical LiNi0.5Mn1.5O4 for 5 V lithium ion secondary batteries

Z. Zhu, D. Zhang, H. Yan, W. Li and Qilu, J. Mater. Chem. A, 2013, 1, 5492 DOI: 10.1039/C3TA10980A

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