Molten salt synthesis of sodium lithium titanium oxide anode material for lithium ion batteries
Molten salt synthesis of sodium lithium titanium oxide anode material for lithium ion batteries
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DOI：
10.1016/j.jallcom.2015.04.113
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发表时间：
2015-09
影响因子：
6.2
通讯作者：
S. Yin;C. Feng;S. J. Wu;H. L. Liu;B. Ke;Kailai Zhang;Donghua Chen
中科院分区：
文献类型：
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作者：
S. Yin;C. Feng;S. J. Wu;H. L. Liu;B. Ke;Kailai Zhang;Donghua Chen
以氯化钠和氯化钾混合物为助熔剂，采用熔盐法合成了钠锂钛氧化物（Na2Li2Ti6O14）。研究了烧结温度、烧结时间、碳酸锂用量等因素对合成的影响。反应产物的粉末X射线衍射和扫描电子显微镜图像表明，在700 °C下获得了纯相钠锂钛氧化物，而在较高温度下，由于锂的蒸发损失，产生了带有晶须的不纯相六钛酸钠。循环伏安和充放电测试结果表明，不同温度下合成的产物由于组分的不同而表现出不同的电化学性质。在700 °C下获得的样品显示出Li+的高度可逆插入和提取，并在1.3 V左右显示出单一的电位平台。在700 °C下2 h得到的产物表现出良好的循环性能，并且在500次循环后保持62 mAh g− 1的比容量。
The sodium lithium titanium oxide with composition Na2Li2Ti6O14has been synthesized by a molten salt synthesis method using sodium chloride and potassium chloride mixture as a flux medium. Synthetic variables on the synthesis, such as sintering temperature, sintering time and the amount of lithium carbonate, were intensively investigated. Powder X-ray diffraction and scanning electron microscopy images of the reaction products indicates that pure phase sodium lithium titanium oxide has been obtained at 700 °C, and impure phase sodium hexatitanate with whiskers produced at higher temperature due to lithium evaporative losses. The results of cyclic voltammetry and discharge–charge tests demonstrate that the synthesized products prepared at various temperatures exhibited electrochemical diversities due to the difference of the components. And the sample obtained at 700 °C revealed highly reversible insertion and extraction of Li+and displayed a single potential plateau at around 1.3 V. The product obtained at 700 °C for 2 h exhibits good cycling properties and retains the specific capacity of 62 mAh g−1after 500 cycles.