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采用 3种化学方法合成锂钛复合氧化物 .应用X -射线衍射分析对其结构进行表征以及电化学性能测试 ,结果表明 :由Li2 CO3、TiO2 高温合成的锂钛复合氧化物为尖晶石结构的Li4Ti5 O12 .Li4Ti5 O12 电极在 1 .5V左右有一放电平台 ,充放电可逆性良好 ,即充电电压平台与此接近 ,且电极的比容量较大 ,循环性能良好 .以 0 .30mA·cm- 2 充放电时 ,首次放电容量可达 30 0mAh·g- 1,可逆比容量为 1 0 0mAh·g- 1,经多次充放电循环后 ,其结构仍保持稳定性 .试验电池测试表明 ,Li4Ti5 O12 可选作Li4Ti5 O12 /LiCoO2 锂离子电池的负极材料 .
Three kinds of chemical methods were used to synthesize lithium - titanium composite oxide. The structure and electrochemical performance of the composite were characterized by X - ray diffraction. The results showed that the lithium - titanium composite oxide synthesized by high temperature Li2CO3 and TiO2 is spinel Li4Ti5 O12. Li4Ti5 O12 electrode has a discharge platform at about 1.5V, charge-discharge reversibility is good, that is, the charging voltage platform is close to this, and the electrode has larger specific capacity and good cycle performance. At 0.30mA · cm-2 When the charge and discharge, the first discharge capacity up to 30 0mAh · g-1, the reversible specific capacity of 100mAh · g-1, after repeated charge and discharge cycles, the structure remains stable.Experimental battery tests show that, Li4Ti5O12 Optional as Li4Ti5 O12 / LiCoO2 lithium-ion battery cathode material.