Li4Ti5O12–LiAlO2 Composite as High Performance Anode Material for Lithium-Ion Battery

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• 作者：Zi-Kui Fang ; Yan-Rong Zhu ; Ting-Feng Yi ; Ying Xie
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：April 4, 2016
• 年：2016
• 卷：4
• 期：4
• 页码：1994-2003
• 全文大小：765K
• ISSN：2168-0485

文摘

A facile solid-state method to improve the rate performance of Li₄Ti₅O₁₂ in lithium-ion batteries by LiAlO₂ in situ modification is presented in this work. XRD shows that the LiAlO₂ modification does not change the spinel structure of Li₄Ti₅O₁₂ but forms Al-doped Li₄Ti₅O₁₂–LiAlO₂ composites, and little Al doping decreases the lattice parameter of doped Li₄Ti₅O₁₂. SEM shows that all samples are composed of 1–2 μm primary particles with irregular shapes. Raman spectra reveal that the intensity of these lines for Li₄Ti₅O₁₂–LiAlO₂ composites obviously decreases caused by a modification of the LiAlO₂ phase. CV and EIS tests indicate that the doping of Al³⁺ and the combination with in situ generated LiAlO₂ on the surface of Li₄Ti₅O₁₂ are favorable for reducing the electrode polarization and charge-transfer resistance, and then improve the reversibility and lithium ion diffusion coefficient of Li₄Ti₅O₁₂, resulting in its relatively higher rate capacity. Charge–discharge tests reveals that Li₄Ti₅O₁₂–LiAlO₂ composite (5 wt %) exhibits the highest rate capacity and cycling stability at various rates, which is capable of large-scale applications, such as electric vehicles and hybrid electric vehicles, requiring high energy, long life and excellent safety.