کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1292857 | 1497949 | 2015 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Fabrication of spinel Li4−xTi5O12 via ion exchange for high-rate lithium-ion batteries Fabrication of spinel Li4−xTi5O12 via ion exchange for high-rate lithium-ion batteries](/preview/png/1292857.png)
• The first report on stepwise substitution of lithium ions by proton to obtain Li1Ti5O12.
• The Li1Ti5O12 electrode materials exhibit excellent electrochemical performance.
• The spinel crystal structure is crucial for the performance of Li4−xTi5O12 anodes.
The present work demonstrates that lithium ions can be stepwise substituted by protons from spinel Li4Ti5O12 crystalline particles though simple ion-exchange in aqueous HCl solution with the aid of heat treatment. This enables us to continuously tune the Li-to-Ti stoichiometric ratios from 0.80 to 0.59, 0.41, 0.21, 0.15, and 0.09, thus transforming Li4Ti5O12 to Li4−xTi5O12 nanocrystals. The resulting nanocrystals maintain the spinel crystal structure when x becomes smaller than 3. Among as-prepared the Li4−xTi5O12 crystalline particles, Li1Ti5O12 shows the highest capacity of 193 mAh g−1 at 1C and 148 mAh g−1 at 20C, lower current impedance (47 Ω), significantly improved rate capability and fairly long cycle life. This excellent electrochemical performance makes spinel Li4−xTi5O12 particles as a promising anode candidate for lithium ion batteries superior.
Journal: Journal of Power Sources - Volume 283, 1 June 2015, Pages 237–242