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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Preparation and characterization of spinel Li_4Ti_5O_(12) anode material from industrial titanyl sulfate solution
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Preparation and characterization of spinel Li_4Ti_5O_(12) anode material from industrial titanyl sulfate solution

机译：工业硫酸氧钛溶液制备尖晶石Li_4Ti_5O_（12）阳极材料及其表征

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摘要

Spinel Li_4Ti_5O_(12) anode material is successfully synthesized by a solid-state method using lithium carbonate and titanium precursors which are prepared by the low cost industrial titanyl sulfate solution. The characters of H_2TiO_3 and TiO_2 precursors are determined by TG/DTA and SEM methods. TG-DAT and EDS methods show that H_2TiO_3 can absorb sulphate ions which can be present as impurities. XRD method shows that the impure phases of Li_2SO_4 and rutile TiO_2 appear in Li_4Ti_5O_(12) synthesized by H_2TiO_3. The formation of Li_2SO_4 is identified in thermodynamics during the process of calcination. Owing to the formation of Li_2SO_4 impurity, the capacity of the Li_4Ti_5O_(12) synthesized by H_2TiO_3 is low. One effective way that can tackle this problem is to remove the sulphur by calcining H_2TiO_3, after calcinations, the production will have a thermal treatment with Li_2CO_3. The obtained Li_4Ti_5O_(12) shows better electrochemical performance. The specific capacities can be increased by 20 mAhg~(-1) at 0.1,0.5 and 1C rates.
机译：尖晶石Li_4Ti_5O_（12）阳极材料是通过固态方法成功合成的，使用的是碳酸锂和钛前体，它们是通过低成本的工业钛氧基硫酸盐溶液制备的。通过TG / DTA和SEM方法测定了H_2TiO_3和TiO_2前驱体的性质。 TG-DAT和EDS方法表明H_2TiO_3可以吸收以杂质形式存在的硫酸根离子。 XRD分析表明，H_2TiO_3合成的Li_4Ti_5O_（12）中出现了Li_2SO_4和金红石型TiO_2的不纯相。 Li_2SO_4的形成在煅烧过程中通过热力学确定。由于形成了Li_2SO_4杂质，由H_2TiO_3合成的Li_4Ti_5O_（12）的容量较低。解决此问题的一种有效方法是通过煅烧H_2TiO_3除去硫，煅烧后，产物将使用Li_2CO_3进行热处理。所获得的Li_4Ti_5O_（12）显示出更好的电化学性能。在0.1、0.5和1C的速率下，比容量可以增加20 mAhg〜（-1）。

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