ChemInform Abstract: Todorokite as a Li Insertion Cathode. Comparison of a Large Tunnel Framework “MnO2” Structure with Its Related Layered Structures.
✍ Scribed by M. J. DUNCAN; F. LEROUX; J. M. CORBETT; L. F. NAZAR
- Publisher
- John Wiley and Sons
- Year
- 2010
- Weight
- 30 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0931-7597
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✦ Synopsis
Todorokite as a Li Insertion Cathode. Comparison of a Large Tunnel Framework "MnO 2 " Structure with Its Related Layered Structures.
-Different methods for Li insertion in a Mn oxide phase with a tunnel (todorokite) framework and its 2D (birnessite/buserite) precursor preparation are presented. At intermediate cycling rates, todorokite displays the highest discharge capacity of 0.6 Li/Mn (155 mAh/g) down to 2.0 V, and 0.52 Li/Mn reversible capacity in the voltage window 4.2-2.0 V. The position of the Mg cations in the framework of todorokite directs the location and occupation of the tunnel sites, and hence may be the cause of the variation in cycling behavior between MnO 4 -todokorite (higher Mg content) and O 2 -todokorite. -(DUNCAN, M.