Preparation and electrochemical performance of Li4−xMgxTi5O12 as anode materials for lithium-ion battery

• Published in: Journal of alloys and compounds Vol. 722; pp. 229 - 234
• Main Authors: Cheng, Qi, Tang, Shun, Liu, Chang, Lan, Qian, Zhao, Jinxing, Liang, Jiyuan, Yan, Ji, Liu, Zuqi, Cao, Yuan-Cheng
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.10.2017; Elsevier BV
• Subjects: Anatase; Anode; Anodes; Chemical compounds; Composition effects; Conductivity; Crystal structure; Discharge; Electrochemical analysis; Electrode materials; Experiments; Lithium ion batteries; Lithium titanium oxide; Magnesium; Magnification; Mg doping; Phase composition; Rechargeable batteries; Resultants; Titanium oxides; Voltammetry; Lithium ion batteries; Mg doping; Conductivity; Anode; Magnification; Lithium titanium oxide
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.06.040

Li4-xMgxTi5O12 (0 ≦ X ≦ 0.2) anode material was synthesized by a solid-state method using Li2CO3, MgO and anatase TiO2. The effects of Mg element doping on the crystal structure, phase composition, morphology and electrochemical properties of Li4-xMgxTi5O12 were investigated by XRD, SEM and EDX. The electrochemical properties of Li4-xMgxTi5O12 were characterized through Cyclic voltammetry and AC impedance experiments. The results indicated that when x = 0.10, the resultants show better electrochemical performance in higher rates cycle stability and the polarization degree. The initial discharge capacity reaches 122.5 mAh/g at 2 C, and the discharge capacity still remains 119.3 mAh/g after 100 cycles. •The doping of Mg2+ can increase the specific capacity and conductivity of the electrode material.•The effects of Mg2+ doping on the structure and electrochemical properties of LTO were studied.•Li3.9Mg0.1Ti5O12 showed better electrochemical performance, higher rates cycle stability.