Li_4–xMg_xTi₅O₁₂(0.05≤x≤0.2) Anode Material with Improved Rate and Electrochemical Performance for Li-Ion Batteries

Spinel-type electrode material Li_4–xMg_xTi₅O₁₂ (x = 0.05, 0.1, 0.15, 0.2) was synthesized by solid state reaction. Magnesium was doped Li₄Ti₅O₁₂ to improve the electrochemistry and cycle performances. The samples were characterized by XRD and the grain size analysis was studies by laser particle-size analyzer. The curve of charge and discharge and cycles of Mg doped Li₄Ti₅O₁₂ were researched. The results showed that the electrochemistry properties and cycle performance of magnesium doped Li₄Ti₅O₁₂ materials were improved. Among the series samples investigated, it was found that the Li_4–xMg_xTi₅O₁₂ (x = 0.1) has a good electrochemistry performance, the first discharge special capacity was 175.3, 148.6, 140.3, 123.6 mAh·g^–1at 0.5 C, 1 C, 5 C, 10 C rate, respectively.