Abstract
The powders of spinel Li4Ti5O12were prepared by heat treating the mixture of rutile TiO2and Li acetate at800∘Cfor 3 h under a nitrogen atmosphere and, for comparison, under air as well. The powders heated underN2show a remarkably higher-rate capability and better cycle stability. The discharge capacity of Li4Ti5O12heated underN2at 19°C (corresponding to a 3.2-minute total discharge) reached 107 mA hg−1, 22 mA hg−1higher than that of Li4Ti5O12heated under air, which was 85 mA hg−1. The former material also shows a much better cycle stability, with no discharge capacity loss after 300 cycles at 6°C or 16.3°C. The results indicate that heat treatment under low-oxygen partial pressure atmosphere such asN2could significantly improve the high-rate performance of spinel Li4Ti5O12.
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