Abstract
The cycling performance of a lithiummanganese oxide spinel (prepared from MnO 2 and Li 2CO 3) has been investigated as a function of preparation temperature in a lithium polymer electrolyte cell. Excellent reversibility and high rate performance have been observed from a spinel phase prepared at 450 °C and of general formula Li x Mn 2− z O 4 (0 ⩽ x ⩽ 1.33, 0 ⩽ z ⩽ 0.33). This phase has a characteristic cubic lattice parameter of ∼ 8.19 Å: less than that found in the stoichiometric spinel material LiMn 2O 4.
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