Abstract
Electrochemical lithium intercalation has been carried out in the Ramsdellite-type structure of Li 2Ti 3O 7. The intercalation of 2.24 lithium ions at a very low potential in this compound leads to the formation of a new phase Li 4.24Ti 3O 7. From powder X-ray diffraction we deduce that the structure of Li 4.24Ti 3O 7 is closely related to the parent Ramsdellite. Both the large reversibility and the relatively high specific capacity (235 Ah Kg −1) make this compound a promising material as the negative electrode for secondary lithium cells.
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