Spinel LiMn 2 O 4 Nanorods as Lithium Ion Battery Cathodes

Do Kyung Kim, P. Muralidharan, Hyun-Wook Lee, Riccardo Ruffo, Yuan Yang, Candace K. Chan, Hailin Peng, Robert A. Huggins, Yi Cui

Research output: Contribution to journalArticlepeer-review

511 Scopus citations

Abstract

Spinel LiMn 2O 4 is a low-cost, environmentally friendly, and highly abundant material for Li-ion battery cathodes. Here, we report the hydrothermal synthesis of single-crystalline β-MnO 2 nanorods and their chemical conversion into free-standing single-crystalline LiMn 2O 4 nanorods using a simple solid-state reaction. The LiMn 2O 4 nanorods have an average diameter of 130 nm and length of 1.2 μm. Galvanostatic battery testing showed that LiMn 2O 4 nanorods have a high charge storage capacity at high power rates compared with commercially available powders. More than 85% of the initial charge storage capacity was maintained for over 100 cycles. The structural transformation studies showed that the Li ions intercalated into the cubic phase of the LiMn 2O 4 with a small change of lattice parameter, followed by the coexistence of two nearly identical cubic phases in the potential range of 3.5 to 4.3V. © 2008 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)3948-3952
Number of pages5
JournalNano Letters
Volume8
Issue number11
DOIs
StatePublished - Nov 12 2008
Externally publishedYes

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