Sol-gel Synthesis and Electrochemical Performance of Li4-xMgxTi5-xZrxO12 Anode Material for Lithium-ion Batteries |
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Authors: | Caixia Qiu Zhongzhi Yuan Ling Liu Sijie Cheng Jincheng Liu |
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Affiliation: | 1. School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China 2. EVE Energy Co.Ltd, Huizhou, Guangdong 516006, China |
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Abstract: | The anode materials Li4?xMgxTi5?xZrxO12 (x=0, 0.05, 0.1) were successfully synthesized by sol‐gel method using Ti(OC4H9)4, CH3COOLi·2H2O, MgCl2·6H2O and Zr(NO3)3·6H2O as raw materials. The crystalline structure, morphology and electrochemical properties of the as‐prepared materials were characterized by XRD, SEM, cyclic voltammograms (CV), electrochemical impedance spectroscopy (EIS) and charge‐discharge cycling tests. The results show that the lattice parameters of the Mg‐Zr doped samples are slightly larger than that of the pure Li4Ti5O12, and Mg‐Zr doping does not change the basic Li4Ti5O12 structure. The rate capability of Li4?xMgxTi5?xZrxO12 (x=0.05, 0.1) electrodes is significantly improved due to the expansile Li+ diffusion channel and reduced charge transfer resistance. In this study, Li3.95Mg0.05Ti4.95Zr0.05O12 represented a relatively good rate capability and cycling stability, after 400 cycles at 10 C, the discharge capacity retained as 134.74 mAh·g?1 with capacity retention close to 100%. The excellent rate capability and good cycling performance make Li3.95Mg0.05Ti4.95Zr0.05O12 a promising anode material in lithium‐ion batteries. |
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Keywords: | Li4Ti5O12 Mg-Zr doping rate performance lithium-ion battery |
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