Metatitanic acid was synthesized from industrial titanyl sulfate solution via controlling pH during hydrolyzing process. Inductively coupled plasma(ICP)analysis confirmed that a little Fe,Mg and Ca were deposited into precursor TiO2·H2O.Spinel Li4Ti5O12 was prepared by sintering amorphous mixture at 800℃for 16 h.The amorphous mixture was activated by ball-milling at room temperature,using the as-prepared TiO2·H2O and Li2CO3 as raw materials.The sample was characterized by X-ray diffractometry,scanning electron microscopy and electrochemical charge and discharge test.The results show that spinel Li4Ti5O12 is obtained,but it contains a few rutile TiO2 impurities.The sample has fine particles with size of around 50 nm and homogenous size distribution.At room temperature,the initial reversible specific capacity of the sample is 136.9,128.0,119.2 and 96.3 mA·h/g at 0.1C, 1C,2C and 5C,respectively,and the sample shows excellent cycling performance.
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机译：通过控制水解过程中的pH值，由工业钛氧基硫酸盐溶液合成偏钛酸。电感耦合等离子体（ICP）分析证实了少量的Fe，Mg和Ca沉积在前驱体TiO2·H2O中。在800℃下烧结16h制备了尖晶石Li4Ti5O12。室温下球磨将其活化以制备的TiO2·H2O和Li2CO3为原料，通过X射线衍射，扫描电子显微镜和电化学充放电试验对样品进行了表征，结果表明得到了尖晶石Li4Ti5O12，但其中含有少量金红石型TiO2杂质。样品具有约50 nm的细小颗粒且尺寸分布均匀。在室温下，样品在0.1C，1C时的初始可逆比容量为136.9、128.0、119.2和96.3 mA·h / g ，2C和5C分别显示出优异的循环性能。
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