尖晶石结构材料Li_2MgTi_3O_8的制备及其电化学性能

Synthesis and electrochemical performance of spinel Li_2MgTi_3O_8 material

以Li2CO3、MgO和TiO2为原料,采用高温固相法合成了具有尖晶石结构材料Li2MgTi3O8。采用X射线衍射(XRD)、傅里叶红外光谱(FTIR)等手段对材料的晶体结构进行了表征,材料的电化学性能通过恒流充放电、循环伏安(CV)进行测试。结果表明,材料具有优异的循环稳定性和良好的库伦效率。在室温下,充放电倍率为0.5C时,Li2MgTi3O8首次放电比容量为215.6mAh·g-1,100周循环后保持在225mAh·g-1。

Spinel lithium magnesium titanium oxide （Li2MgTi3O8）was synthesized via Solid-state method with Li2 CO3, MgO and TiO2 as raw material. The structure of the as-prepared anode materials was characterized by X-ray diffraction（XRD） ,fourier trans- form infrared spectrometer（FTIR）. The electrochemical performance of Li2MgTi3O8 was investigated by galvanostatic charge-dis- charge tests and cyclic voltammetry（CV）. The results showed that Li2MgTi3O8 has good cycling capacity and rate capability as lithi- um-ion battery cathode materials. The initial discharge capacity of Li2MgTi3O8 at 0. 5C was 215. 6mAh·g-1 ,it was still at 225mAh ·g-1 after 100 cycles.