Citation: WU Yue, LIU Xing-Quan, ZHANG Zheng, ZHAO Hong-Yuan. Preparation and Characterization of M(Ⅱ) and M(Ⅳ) Iso-Molar Co-Doped LiMn_1.9Mg_0.05Ti_0.05O₄ Cathode Materials for Lithium-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2014, 30(12): 2283-2290. doi: 10.3866/PKU.WHXB201410132 shu

Preparation and Characterization of M(Ⅱ) and M(Ⅳ) Iso-Molar Co-Doped LiMn_1.9Mg_0.05Ti_0.05O₄ Cathode Materials for Lithium-Ion Batteries

1.
State Key Laboratory of Electronic Thin Film and Integrated Devices, School of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

Received Date: 9 July 2014
Available Online: 13 October 2014
Fund Project: 国家自然科学基金(21071026) (21071026)电子科技大学杰出人才引进项目(08JC00303)资助 (08JC00303)

An Mg(Ⅱ) and Ti(Ⅳ), iso-molar, co-doped cathode material LiMn_1.9Mg_0.05Ti_0.05O₄ for lithium-ion batteries was successfully synthesized via a sol-gel method, using lithium hydroxide, manganese acetate, magnesium nitrate, and butyl titanate as raw materials, and citric acid as a chelating agent. The as-prepared materials were characterized using thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical tests (including cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements). The results demonstrated that the cathode material LiMn_1.9Mg_0.05Ti_0.05O₄, which was obtained after calcination at 780℃ for 12 h, exhibited a fine microstructure and od electrochemical performance. When cycled at 4.35-3.30 V at room temperature, LiMn_1.9Mg_0.05Ti_0.05O₄ delivered a discharge specific capacity of 126.8 mAh·g^-1 at 0.5C rate, and maintained a capacity of 118.5 mAh·g^-1 after 50 cycles; the capacity retention of this material reached 93.5%. This material showed a discharge-specific capacity of 111.9 mAh·g^-1 at 0.5C rate after 30 cycles, when it was cycled at 55℃; under these conditions the capacity retention reached 91.9%, far superior to the capacity retention of undoped LiMn₂O₄. The iso-molar co-doping of LiMn₂O₄ with Mg(Ⅱ) and Ti(Ⅳ) ions led to significant modification of the electronic and ionic conductivity, and increased the rate properties and electrochemical performance of the spinel lithium manganate at elevated temperatures.
- Lithium ion battery,
- Cathode material,
- Spinel lithium manganate,
- Sol-gel method,
- Mg, Ti co-doping
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Preparation and Characterization of M(Ⅱ) and M(Ⅳ) Iso-Molar Co-Doped LiMn1.9Mg0.05Ti0.05O4 Cathode Materials for Lithium-Ion Batteries

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通讯作者: 陈斌, bchen63@163.com

Preparation and Characterization of M(Ⅱ) and M(Ⅳ) Iso-Molar Co-Doped LiMn_1.9Mg_0.05Ti_0.05O₄ Cathode Materials for Lithium-Ion Batteries