Effect of freeze-drying and self-ignition process on the microstructural and electrochemical properties of Li4Ti5O12
Effect of freeze-drying and self-ignition process on the microstructural and electrochemical properties of Li4Ti5O12
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DOI：
10.1016/j.materresbull.2013.07.035
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发表时间：
2013-11
影响因子：
5.4
通讯作者：
C. Jamin;K. Traina;David Eskenazi;N. Krins;R. Cloots;B. Vertruyen;F. Boschini
中科院分区：
文献类型：
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作者：
C. Jamin;K. Traina;David Eskenazi;N. Krins;R. Cloots;B. Vertruyen;F. Boschini
以异丙醇钛、硝酸锂和羟丙基甲基纤维素（HPMC）为原料，通过冷冻干燥和自燃法制备了晶体li4ti5o12。该合成路线在800°C下煅烧2小时后得到结晶li4ti5o12颗粒。在另一种合成路线中，硝酸铵的加入将自燃模式从波状传播转变为同步传播。从而得到具有不同微观结构的粉末。电化学表征表明，在不添加硝酸铵的情况下制备的粉末中，Li+的嵌入/脱嵌效果最好。这些结果强调了控制自燃模式以获得足够性能的必要性。
Crystalline Li4Ti5O12is synthesized by a method involving the freeze-drying and self-ignition of a gel prepared from titanium isopropoxide, lithium nitrate and hydroxypropylmethylcellulose (HPMC). This synthesis route yields crystalline Li4Ti5O12particles after calcination at 800 °C for 2 h. In an alternative route, addition of ammonium nitrate shifts the self-ignition mode from wave-like propagation to simultaneous. Powders with different microstructures are thereby obtained. Electrochemical characterization shows that the best results for Li+intercalation/desintercalation are obtained for the powder prepared without ammonium nitrate addition. These results highlight the necessity for a control of the self-ignition mode to obtain adequate properties.