Journal
MATERIALS LETTERS
Volume 65, Issue 9, Pages 1319-1322Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2011.01.073
Keywords
Manganese dioxide; Layer structure; Cathode; Lithium ion batteries
Funding
- Australian Research Council [DP1094261]
- Key Subject (Laboratory) Research Foundation of Shandong Province in PR China
- Australian Research Council [DP1094261] Funding Source: Australian Research Council
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Layer structured delta-MnO2 was synthesized by a microwave-assisted hydrothermal method. The morphology of the product consists of flower-like spheres that range from about 200 nm to 3 mu m in diameter and are composed of sheets about 5-10 nm in thickness. When tested in the voltage range of 2 to 4.5 V vs. Li+/Li in coin cells, the separator is blocked, handicapping Li+ conductivity and leading to cell failure. When tested in the voltage range of 2 to 4 V in ethylene carbonate/dimethyl carbonate (EC/DMC), the delta-MnO2 delivers an initial reversible capacity of 143.7 mAh g(-1) and can maintain 120 mAh g(-1) at the 60th cycle. The delta-MnO2 electrode shows good cycling stability at different current densities and delivers a discharge capacity of about 90 mAh g(-1) at 1 C, indicating that it is a promising cathode material for lithium ion batteries. (C) 2011 Elsevier B.V. All rights reserved.
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