Lithium chromium oxide modified spinel LiCrTiO4 with improved electrochemical properties
Lithium chromium oxide modified spinel LiCrTiO4 with improved electrochemical properties
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DOI：
10.1039/c2jm32673f
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发表时间：
2012-01-01
影响因子：
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通讯作者：
Chen, Chunhua
中科院分区：
文献类型：
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作者：
Feng, Xuyong;Shen, Chen;Chen, Chunhua
采用丙烯酸聚合法制备了锂铬氧化钛尖晶石粉体。空气中合成的LiCrTiO4样品的插锂容量约为150 mA h g(-1)，与理论容量（157 mA h g(-1)）非常接近。除了具有与Li4Ti5O12相似的良好循环性能外，LiCrTiO4还具有优异的倍率性能，在1C到10C倍率电流密度下没有明显的容量损失。通过拉曼光谱、透射电镜和x射线光电子能谱分析，发现在空气中合成的LiCrTiO4样品中含有少量的锂铬氧化物（LiCrxOy, y > 1/2 + 3x/2）作为原位制备的改性剂，可以提高电极的导电性。
Lithium chromium titanium oxide (LiCrTiO4) spinel powders are synthesized by an acrylic acid polymerization method. The lithium intercalation capacity of the LiCrTiO4 sample synthesized in air is about 150 mA h g(-1), which is very close to its theoretical capacity (157 mA h g(-1)). In addition to its very good cycle performance similar to that of Li4Ti5O12, the LiCrTiO4 shows excellent rate performance with no obvious capacity loss at the current density from 1C to 10C rates. By means of Raman spectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, the LiCrTiO4 sample synthesized in air is found to contain a small amount of lithium chromium oxide (LiCrxOy, y > 1/2 + 3x/2) as an in situ produced modifier that can improve the conductivity of the electrode.