Evidence of Two-Phase Formation Upon Lithium Insertion into the Li 1.33 Ti 1.67 O 4 Spinel.-The title compound is prepared from Li 2 CO 3 and TiO 2 and Li is electrochemically inserted at room temperature. The defect spinel compound Li 1.33 Ti 1.67 O 4 and the fully lithiated compound Li 2.33 Ti 1.67 O 4 with ordered rock salt type structure show nearly identical X-ray patterns. Precise analysis of the obtained data supplies evidence for the presence of two distinct phases which are mutually interconvertible upon Li exchange. -(SCHARNER, S.; WEPPNER, W.; SCHMID-BEURMANN, P.; J.
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