Evaluation of Titanium Dioxide (Anatase) from Oxalato‐polytitanate as an Active Material for Rechargeable Lithium Batteries
Evaluation of Titanium Dioxide (Anatase) from Oxalato‐polytitanate as an Active Material for Rechargeable Lithium Batteries
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DOI：
10.1149/1.1838167
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发表时间：
1997-12
影响因子：
3.9
通讯作者：
Y. Yagi;M. Hibino;T. Kudo
中科院分区：
文献类型：
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作者：
Y. Yagi;M. Hibino;T. Kudo
以碳化钛和过氧化氢为原料，合成了一种草酸配体掺杂的聚钛酸。在较低温度（330℃）下热分解，得到含有一定碳的二氧化钛（锐钛矿）粉末（C/Ti = 0.06）。根据拉曼光谱，碳是无定形的，可能分散在锐钛矿颗粒表面，具有较高的BET面积（brunauer - emmet - teller测量法）（{负}70 m{sup 2}/g），尽管扫描电子显微镜不能直接观察到这一点。作者发现，碳的掺入提高了锐钛矿作为非水锂电池活性材料的性能。与锂可逆插入相关的比容量增加到167 mAh/g，而由类似前驱体合成的无碳锐钛矿则为30 mAh/g。此外，碳的掺入大大抑制了反复充放电循环导致的容量下降。阻抗测量表明，碳在增加电化学插入界面的有效面积方面发挥了作用。
A kind of polytitanic acid incorporated with oxalate ligands was synthesized by a reaction of titanium carbide with hydrogen peroxide. On thermal decomposition at relatively low temperature (330 C), it yielded powder of titanium dioxide (anatase), containing carbon to some extent (C/Ti = 0.06). Carbon was amorphous according to the Raman spectroscopy, and probably dispersed over the surface of anatase particles with a relatively high BET area (Brunauer-Emmett-Teller measurement method) ({minus}70 m{sup 2}/g), although this was not directly observed with scanning electron microscopy. The authors found that incorporation of carbon enhanced performance of anatase as an active material for nonaqueous lithium batteries. The specific capacity associated with reversible insertion of lithium was increased to 167 mAh/g, as compared to 30 for carbon-free anatase synthesized from a similar precursor. Moreover, a decline in capacity with repeated charge-discharge cycles was very much suppressed by incorporation of carbon. Impedance measurements showed that carbon played a role in increasing the effective area of the interface involved in electrochemical insertion.