Issue 39, 2012

Enhanced Li+ ion transport in LiNi0.5Mn1.5O4 through control of site disorder

Abstract

High voltage spinel LiNi0.5Mn1.5O4 is a very promising cathode material for lithium ion batteries that can be used to power hybrid electrical vehicles (HEVs). Through careful control of the cooling rate after high temperature calcination, LiNi0.5Mn1.5O4 spinels with different disordered phase and/or Mn3+ contents have been synthesized. It is revealed that during the slow cooling process (<3 °C min−1), oxygen deficiency is reduced by the oxygen intake, thus the residual Mn3+ amount is also decreased in the spinel due to charge neutrality. In situ X-ray diffraction (XRD) demonstrates that the existence of a disordered phase fundamentally changes the spinel phase transition pathways during the electrochemical charge–discharge process. The presence of an appropriate amount of oxygen deficiency and/or Mn3+ is critical to accelerate the Li+ ion transport within the crystalline structure, which is beneficial to enhance the electrochemical performance of LiNi0.5Mn1.5O4. LiNi0.5Mn1.5O4 with an appropriate amount of disordered phase offers high rate capability (96 mAh g−1 at 10 °C) and excellent cycling performance with 94.8% capacity retention after 300 cycles. The fundamental findings in this work can be widely applied to guide the synthesis of other mixed oxides or spinels as high performance electrode materials for lithium ion batteries.

Graphical abstract: Enhanced Li+ ion transport in LiNi0.5Mn1.5O4 through control of site disorder

Supplementary files

Article information

Article type
Communication
Submitted
28 Ağu 2012
Accepted
29 Ağu 2012
First published
11 Eyl 2012

Phys. Chem. Chem. Phys., 2012,14, 13515-13521

Enhanced Li+ ion transport in LiNi0.5Mn1.5O4 through control of site disorder

J. Zheng, J. Xiao, X. Yu, L. Kovarik, M. Gu, F. Omenya, X. Chen, X. Yang, J. Liu, G. L. Graff, M. S. Whittingham and J. Zhang, Phys. Chem. Chem. Phys., 2012, 14, 13515 DOI: 10.1039/C2CP43007J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements