Issue 34, 2012
From the journal:

Journal of Materials Chemistry

Surface-oriented and nanoflake-stacked LiNi0.5Mn1.5O4 spinel for high-rate and long-cycle-life lithium ion batteries

Zhongxue Chen,ac   Shen Qiu,b   Yuliang Cao,*a   Xinping Ai,b   Kai Xie,c   Xiaobin Hongc  and  Hanxi Yang*b  

* Corresponding authors

a Hubei Key Lab. of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
E-mail: ylcao@whu.edu.cn
Fax: +86-27-87884476
Tel: +86-27-68754526

b College of Chemistry and Molecular Sciences, Wuhan university, Wuhan 430072, China
E-mail: hxyang@whu.edu.cn

c Department of Material Science and Applied Chemistry, National University of Defence Technology, Changsha 410073, China

Abstract

Spinel LiNi0.5Mn1.5O4 has attracted extensive interest as an appealing cathode material of next generation lithium-ion batteries to meet the cost/performance requirements for electric vehicle applications and renewable electric energy storage. In this paper, we report, for the first time, a nanoflake-stacked LiNi0.5Mn1.5O4 spinel with oriented growth of the (001) planes synthesized via an in situ template route. The resultant LiNi0.5Mn1.5O4 cathode delivers an initial discharge capacity of 133.5 mA h g−1 at 1 C with capacity retention of 86% after 500 cycles. X-ray diffraction and transmission electron microscopy results suggest that the growth of (111) facets on the surfaces of the nanoflake-stacked LiNi0.5Mn1.5O4 spinel is significantly restricted, which helps to inhibit the dissolution of manganese from the lattice and ensure an excellent cycling stability. Moreover, the very thin nanoflakes and large interspaces between the nanoflakes are favorable for Li ion transportation, leading to a fast kinetics of the LiNi0.5Mn1.5O4 spinel. As a result, the material demonstrates a reversible capacity of 96 mA h g−1 even at 50 C rate, showing a feasible application for high-power lithium ion batteries. In particular, this study provides a synthetic strategy to fabricate insertion materials with a surface-oriented morphology and nanoflake-stacked structure for energy storage, fast-ion conductors and other applications.

Graphical abstract: Surface-oriented and nanoflake-stacked LiNi0.5Mn1.5O4 spinel for high-rate and long-cycle-life lithium ion batteries

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Article information

DOI
https://doi.org/10.1039/C2JM33338D
Article type
Paper
Submitted
24 May 2012
Accepted
04 Jul 2012
First published
06 Jul 2012

J. Mater. Chem., 2012,22, 17768-17772

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Surface-oriented and nanoflake-stacked LiNi0.5Mn1.5O4 spinel for high-rate and long-cycle-life lithium ion batteries

Z. Chen, S. Qiu, Y. Cao, X. Ai, K. Xie, X. Hong and H. Yang, J. Mater. Chem., 2012, 22, 17768 DOI: 10.1039/C2JM33338D

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