Synergistic effects of various morphologies and Al doping of spinel LiMn2O4 nanostructures on the electrochemical performance of lithium-rechargeable batteries

Won-Hee Ryu; Ji-Yong Eom; Ri-Zhu Yin; Dong-Wook Han; Won-Keun Kim; Hyuk-Sang Kwon

doi:10.1039/C1JM10146C

Synergistic effects of various morphologies and Al doping of spinel LiMn₂O₄nanostructures on the electrochemical performance of lithium-rechargeable batteries

Won-Hee Ryu,^a Ji-Yong Eom,^b Ri-Zhu Yin,^b Dong-Wook Han,^a Won-Keun Kim^a and Hyuk-Sang Kwon*^a

* Corresponding authors

^a Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
E-mail: hskwon@kaist.ac.kr
Fax: +82-42-350-3310
Tel: +82-42-350-3326

^b Battery Development Team, Energy Business Division, Samsung SDI Co., Ltd., Cheonan, Chungcheongnam-do, Republic of Korea

Abstract

Nanostructured electrodes have recently received great attention as components in lithium rechargeable batteries, especially because of the high power produced by the fast kinetic properties of these unique structures. Here, we report the successful synthesis of various nanostructured morphologies of spinel lithium manganese oxide electrodes (nanorod, nanothorn sphere, and sphere) from a similarly shaped manganese dioxide precursor that was controlled with different aluminium contents by the hydrothermal method. Among these structures, nanothorn sphere structured LiAl_0.02Mn_1.98O₄ produces the highest discharge capacity of 129.8 mA h g⁻¹, excellent rate capability (94.6 mA h g⁻¹ at 20 C, 72% of 0.2 C-rate discharge capacity) and stable cyclic retention for 50 cycles. The excellent kinetic properties of the nanothorn sphere structure are not only due to the nanothorn sphere electrode having high surface area but also because the critical amount of Al in the nanothorn sphere electrode was located at the Mn site (16d) instead of the Li site (8a).

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Article information

DOI: https://doi.org/10.1039/C1JM10146C
Article type: Paper
Submitted: 11 Jan 2011
Accepted: 02 Aug 2011
First published: 30 Aug 2011

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J. Mater. Chem., 2011,21, 15337-15342

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Synergistic effects of various morphologies and Al doping of spinel LiMn₂O₄ nanostructures on the electrochemical performance of lithium-rechargeable batteries

W. Ryu, J. Eom, R. Yin, D. Han, W. Kim and H. Kwon, J. Mater. Chem., 2011, 21, 15337 DOI: 10.1039/C1JM10146C

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