Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 40, Pages 22413-22420Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06386
Keywords
Li-ion recharegeable battery; LiMn2O4; thin film; nanostructured; rate performance; cathode
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Ultrathin LiMn2O4 electrode layers with average crystal size of similar to 15 nm were fabricated by means of radio frequency sputtering. Cycling behavior and rate performance was evaluated by galvanostatic charge and discharge measurements. The thinnest films show the highest volumetric capacity and best cycling stability, retaining the initial capacity over 70 (dis)charging cycles when manganese dissolution is prevented. The increased stability for film thicknesses below SO nm allows cycling in both the 4 and 3 V potential regions, resulting in a high volumetric capacity of 1.2 Ah/cm(3). It is shown that the thinnest films can be charged to 75% of their full capacity within 18 s (200 C), the best rate performance reported for LiMn2O4. This is explained by the short diffusion lengths inherent to thin films and the absence of phase transformation.
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