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Journal of Nanomaterials
Volume 2011, Article ID 635416, 6 pages
http://dx.doi.org/10.1155/2011/635416
Research Article

LTHeattreated under Nitrogen Ambient with Outstanding Rate Capabilities

1State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering of Tsinghua University, Beijing 100084, China
2China Astronaut Center, Beijing 100094, China

Received 1 June 2010; Revised 12 September 2010; Accepted 28 September 2010

Academic Editor: Quanqin Dai

Copyright © 2011 Rui Xu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The powders of spinel LT were prepared by heat treating the mixture of rutile Ti and Li acetate at for 3 h under a nitrogen atmosphere and, for comparison, under air as well. The powders heated under show a remarkably higher-rate capability and better cycle stability. The discharge capacity of LT heated under at 19°C (corresponding to a 3.2-minute total discharge) reached 107 mA h , 22 mA h higher than that of LT heated under air, which was 85 mA h . The former material also shows a much better cycle stability, with no discharge capacity loss after 300 cycles at 6°C or 16.3°C. The results indicate that heat treatment under low-oxygen partial pressure atmosphere such as could significantly improve the high-rate performance of spinel LT.