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High rate capabilities of Li4Ti5-xVxO12 ( 0 <= x <= 0.3) anode materials prepared by a sol-gel method for use in power lithium ion batteries

机译:通过溶胶-凝胶法制备的用于动力锂离子电池的Li4Ti5-xVxO12(0 <= x <= 0.3)负极材料的高倍容量

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Spinel-type vanadium-doped Li4Ti5-xVxO12 (0 <= x <= 0.3) samples (LTOVs) were synthesized via a sol-gel method. It was found that the LTOV samples consisted of nanoparticles 5-15 nm in diameter. The V doping did not result in any change of phase in the structure and barely affected the lattice parameters, although it did vary the ratio of the Ti3+ and Ti4+ oxidation states. The electrochemical analyses showed that the best discharge capacities were obtained from the Li4Ti5-xVxO12 (x = 0.06) electrode (LTOV06 electrode) in the voltage range 1-2.5 V at 0.2, 0.5, 1, 2 and 5 C with 208, 198, 189, 179 and 157 mA h g(-1), respectively. At 1 C the discharge capacity remained at 186 mA h g(-1) after 50 cycles, maintaining a good cycle performance. In the voltage range 0-2.5 V at 5 C, the initial discharge capacity of the LTOV06 electrode was 243 mA h g(-1) and 89% was retained after 250 cycles. These results indicate that LTOV06 is a promising high rate anode material for lithium ion batteries.
机译:通过溶胶-凝胶法合成了尖晶石型钒掺杂的Li4Ti5-xVxO12(0 <= x <= 0.3)样品(LTOV)。发现LTOV样品由直径为5-15nm的纳米颗粒组成。尽管V掺杂确实改变了Ti3 +和Ti4 +氧化态的比率,但V掺杂并未导致结构中的任何相变且几乎不影响晶格参数。电化学分析表明,从Li4Ti5-xVxO12(x = 0.06)电极(LTOV06电极)获得了最佳放电容量,电压范围为1-2.5 V,在0.2、0.5、1、2和5 C,208、198,分别为189、179和157 mA hg(-1)。在1 C下,经过50个循环后,放电容量保持在186 mA h g(-1),保持了良好的循环性能。在5 C的0-2.5 V电压范围内,LTOV06电极的初始放电容量为243 mA h g(-1),在250个循环后仍保持89%。这些结果表明,LTOV06是一种有前途的锂离子电池高倍率负极材料。

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