研究了锂离子负极材料掺镁尖晶石Li4-xMgxTi5O12(0≤x≤0.25)的合成、结构及电化学性能。XRD结构分析显示Mg^2+进入晶格后可能占据正四面体(8a)和正八面体(16d)位置;掺镁后电导率有所提高,特别是Li3.75Mg0.25Ti5O12(x=0.25),其电化学反应阻抗显著降低,电导率提高了半个数量级;同时降低了面积比阻抗(ASI),改善了材料倍率性能。
Mg-substituted spinel compounds Li4-xMgxTi5O12(0≤x≤0.25)have been investigated as anode materials for Lithium-ion batteries.The results of XRD diffraction indicated the divalent Mg ions are located at two possible crystallographic sites,the tetrahedral(8a) sites and the octahedral(16d) sites of the cubic spinel structure.The substitution decreases the electrochemical reaction impedance and increases the conductivity,typically for Li3.75Mg0.25Ti5O12(x=0.25).The improved conductivity decreases the area specific impedance(ASI) and increases the rate capability of the anode materials.